Articles | Volume 23, issue 3
https://doi.org/10.5194/acp-23-2003-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-23-2003-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Feb 2023
Research article |
| 08 Feb 2023
| 08 Feb 2023
Experimental chemical budgets of OH, HO2, and RO2 radicals in rural air in western Germany during the JULIAC campaign 2019
Changmin Cho
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
now at: School of Earth Sciences and Environmental Engineering,
Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Andreas Hofzumahaus
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Frank Holland
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
William J. Bloss
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Birmingham, UK
Birger Bohn
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Hans-Peter Dorn
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Marvin Glowania
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Thorsten Hohaus
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Paul S. Monks
Department of Chemistry, University of Leicester, Leicester, UK
Doreen Niether
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Franz Rohrer
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Roberto Sommariva
Department of Chemistry, University of Leicester, Leicester, UK
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Birmingham, UK
Zhaofeng Tan
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Ralf Tillmann
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Astrid Kiendler-Scharr
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Andreas Wahner
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
Forschungszentrum Jülich, Institute of Energy and Climate
Research, Troposphere (IEK-8), Jülich, Germany
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Machine learning is being more widely used across environmental and climate science. This work reviews the use of machine learning in tropospheric ozone research, focusing on three main application areas in which significant progress has been made. Common challenges in using machine learning across the three areas are highlighted, and future directions for the field are indicated.
Hassnae Erraji, Philipp Franke, Astrid Lampert, Tobias Schuldt, Ralf Tillmann, Andreas Wahner, and Anne Caroline Lange
Atmos. Chem. Phys., 24, 13913–13934, https://doi.org/10.5194/acp-24-13913-2024, https://doi.org/10.5194/acp-24-13913-2024, 2024
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Four-dimensional variational data assimilation allows for the simultaneous optimisation of initial values and emission rates by using trace-gas profiles from drone observations in a regional air quality model. Assimilated profiles positively impact the representation of air pollutants in the model by improving their vertical distribution and ground-level concentrations. This case study highlights the potential of drone data to enhance air quality analyses including local emission evaluation.
Florian Berg, Anna Novelli, René Dubus, Andreas Hofzumahaus, Frank Holland, Andreas Wahner, and Hendrik Fuchs
Atmos. Chem. Phys., 24, 13715–13731, https://doi.org/10.5194/acp-24-13715-2024, https://doi.org/10.5194/acp-24-13715-2024, 2024
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This study reports temperature-dependent rate coefficients of the reaction of atmospherically relevant hydrocarbons from biogenic sources (methyl vinyl ketones and monoterpenes) and anthropogenic sources (alkanes and aromatics). Measurements were done at atmospheric conditions (ambient pressure and temperature range) in air.
Junwei Song, Georgios I. Gkatzelis, Ralf Tillmann, Nicolas Brüggemann, Thomas Leisner, and Harald Saathoff
Atmos. Chem. Phys., 24, 13199–13217, https://doi.org/10.5194/acp-24-13199-2024, https://doi.org/10.5194/acp-24-13199-2024, 2024
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Biogenic volatile organic compounds (BVOCs) and organic aerosol (OA) particles were measured online in a stressed spruce-dominated forest. OA was mainly attributed to the monoterpene oxidation products. The mixing ratios of BVOCs were higher than the values previously measured in other temperate forests. The results demonstrate that BVOCs are influenced not only by meteorology and biogenic emissions but also by local anthropogenic emissions and subsequent chemical transformation processes.
Kuo-Ying Wang, Philippe Nedelec, Valerie Thouret, Hannah Clark, Andreas Wahner, and Andreas Petzold
EGUsphere, https://doi.org/10.5194/egusphere-2024-2414, https://doi.org/10.5194/egusphere-2024-2414, 2024
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We use routine in-service commercial passenger airplanes Airbus A340 and A330 to collect air pollutants in the upper troposphere. The beauty in using commercial airplanes is that these commercial airplanes, like taxi on the ground, keep flying all the time. We find that short-lived air pollutants are very sensitive to ground-level emissions. Effective regulation in ground-level emissions can help to reduce air pollution in the upper troposphere.
Hengheng Zhang, Christian Rolf, Ralf Tillmann, Christian Wesolek, Frank Gunther Wienhold, Thomas Leisner, and Harald Saathoff
Aerosol Research, 2, 135–151, https://doi.org/10.5194/ar-2-135-2024, https://doi.org/10.5194/ar-2-135-2024, 2024
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Our study employs advanced tools, including scanning lidar, balloons, and UAVs, to explore aerosol particles in the atmosphere. The scanning lidar offers distinctive near-ground-level insights, enriching our comprehension of aerosol distribution from ground level to the free troposphere. This research provides valuable data for comparing remote sensing and in situ aerosol measurements, advancing our understanding of aerosol impacts on radiative transfer, clouds, and air quality.
Jianghao Li, Alastair C. Lewis, Jim R. Hopkins, Stephen J. Andrews, Tim Murrells, Neil Passant, Ben Richmond, Siqi Hou, William J. Bloss, Roy M. Harrison, and Zongbo Shi
Atmos. Chem. Phys., 24, 6219–6231, https://doi.org/10.5194/acp-24-6219-2024, https://doi.org/10.5194/acp-24-6219-2024, 2024
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A summertime ozone event at an urban site in Birmingham is sensitive to volatile organic compounds (VOCs) – particularly those of oxygenated VOCs. The roles of anthropogenic VOC sources in urban ozone chemistry are examined by integrating the 1990–2019 national atmospheric emission inventory into model scenarios. Road transport remains the most powerful means of further reducing ozone in this case study, but the benefits may be offset if solvent emissions of VOCs continue to increase.
Felix Wieser, Rolf Sander, Changmin Cho, Hendrik Fuchs, Thorsten Hohaus, Anna Novelli, Ralf Tillmann, and Domenico Taraborrelli
Geosci. Model Dev., 17, 4311–4330, https://doi.org/10.5194/gmd-17-4311-2024, https://doi.org/10.5194/gmd-17-4311-2024, 2024
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The chemistry scheme of the atmospheric box model CAABA/MECCA is expanded to achieve an improved aerosol formation from emitted organic compounds. In addition to newly added reactions, temperature-dependent partitioning of all new species between the gas and aqueous phases is estimated and included in the pre-existing scheme. Sensitivity runs show an overestimation of key compounds from isoprene, which can be explained by a lack of aqueous-phase degradation reactions and box model limitations.
Yarê Baker, Sungah Kang, Hui Wang, Rongrong Wu, Jian Xu, Annika Zanders, Quanfu He, Thorsten Hohaus, Till Ziehm, Veronica Geretti, Thomas J. Bannan, Simon P. O'Meara, Aristeidis Voliotis, Mattias Hallquist, Gordon McFiggans, Sören R. Zorn, Andreas Wahner, and Thomas F. Mentel
Atmos. Chem. Phys., 24, 4789–4807, https://doi.org/10.5194/acp-24-4789-2024, https://doi.org/10.5194/acp-24-4789-2024, 2024
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Highly oxygenated organic molecules are important contributors to secondary organic aerosol. Their yield depends on detailed atmospheric chemical composition. One important parameter is the ratio of hydroperoxy radicals to organic peroxy radicals (HO2/RO2), and we show that higher HO2/RO2 ratios lower the secondary organic aerosol yield. This is of importance as laboratory studies are often biased towards organic peroxy radicals.
Rongrong Wu, Sören R. Zorn, Sungah Kang, Astrid Kiendler-Scharr, Andreas Wahner, and Thomas F. Mentel
Atmos. Meas. Tech., 17, 1811–1835, https://doi.org/10.5194/amt-17-1811-2024, https://doi.org/10.5194/amt-17-1811-2024, 2024
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Recent advances in high-resolution time-of-flight chemical ionization mass spectrometry (CIMS) enable the detection of highly oxygenated organic molecules, which efficiently contribute to secondary organic aerosol. Here we present an application of fuzzy c-means (FCM) clustering to deconvolve CIMS data. FCM not only reduces the complexity of mass spectrometric data but also the chemical and kinetic information retrieved by clustering gives insights into the chemical processes involved.
Can Ye, Keding Lu, Xuefei Ma, Wanyi Qiu, Shule Li, Xinping Yang, Chaoyang Xue, Tianyu Zhai, Yuhan Liu, Xuan Li, Yang Li, Haichao Wang, Zhaofeng Tan, Xiaorui Chen, Huabin Dong, Limin Zeng, Min Hu, and Yuanhang Zhang
Atmos. Chem. Phys., 23, 15455–15472, https://doi.org/10.5194/acp-23-15455-2023, https://doi.org/10.5194/acp-23-15455-2023, 2023
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In this study, combining comprehensive field measurements and a box model, we found NO2 conversion on the ground surface was the most important source for HONO production among the proposed heterogeneous and gas-phase HONO sources. In addition, HONO was found to evidently enhance O3 production and aggravate O3 pollution in summer in China. Our study improved our understanding of the relative importance of different HONO sources and the crucial role of HONO in O3 formation in polluted areas.
Robert Woodward-Massey, Roberto Sommariva, Lisa K. Whalley, Danny R. Cryer, Trevor Ingham, William J. Bloss, Stephen M. Ball, Sam Cox, James D. Lee, Chris P. Reed, Leigh R. Crilley, Louisa J. Kramer, Brian J. Bandy, Grant L. Forster, Claire E. Reeves, Paul S. Monks, and Dwayne E. Heard
Atmos. Chem. Phys., 23, 14393–14424, https://doi.org/10.5194/acp-23-14393-2023, https://doi.org/10.5194/acp-23-14393-2023, 2023
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Measurements of OH, HO2 and RO2 radicals and also OH reactivity were made at a UK coastal site and compared to calculations from a constrained box model utilising the Master Chemical Mechanism. The model agreement displayed a strong dependence on the NO concentration. An experimental budget analysis for OH, HO2, RO2 and total ROx demonstrated significant imbalances between HO2 and RO2 production rates. Ozone production rates were calculated from measured radicals and compared to modelled values.
Jacky Y. S. Pang, Florian Berg, Anna Novelli, Birger Bohn, Michelle Färber, Philip T. M. Carlsson, René Dubus, Georgios I. Gkatzelis, Franz Rohrer, Sergej Wedel, Andreas Wahner, and Hendrik Fuchs
Atmos. Chem. Phys., 23, 12631–12649, https://doi.org/10.5194/acp-23-12631-2023, https://doi.org/10.5194/acp-23-12631-2023, 2023
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In this study, the oxidations of sabinene by OH radicals and ozone were investigated with an atmospheric simulation chamber. Reaction rate coefficients of the OH-oxidation reaction at temperatures between 284 to 340 K were determined for the first time in the laboratory by measuring the OH reactivity. Product yields determined in chamber experiments had good agreement with literature values, but discrepancies were found between experimental yields and expected yields from oxidation mechanisms.
Marc von Hobe, Domenico Taraborrelli, Sascha Alber, Birger Bohn, Hans-Peter Dorn, Hendrik Fuchs, Yun Li, Chenxi Qiu, Franz Rohrer, Roberto Sommariva, Fred Stroh, Zhaofeng Tan, Sergej Wedel, and Anna Novelli
Atmos. Chem. Phys., 23, 10609–10623, https://doi.org/10.5194/acp-23-10609-2023, https://doi.org/10.5194/acp-23-10609-2023, 2023
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The trace gas carbonyl sulfide (OCS) transports sulfur from the troposphere to the stratosphere, where sulfate aerosols are formed that influence climate and stratospheric chemistry. An uncertain OCS source in the troposphere is chemical production form dimethyl sulfide (DMS), a gas released in large quantities from the oceans. We carried out experiments in a large atmospheric simulation chamber to further elucidate the chemical mechanism of OCS production from DMS.
Midhun George, Maria Dolores Andrés Hernández, Vladyslav Nenakhov, Yangzhuoran Liu, John Philip Burrows, Birger Bohn, Eric Förster, Florian Obersteiner, Andreas Zahn, Theresa Harlaß, Helmut Ziereis, Hans Schlager, Benjamin Schreiner, Flora Kluge, Katja Bigge, and Klaus Pfeilsticker
Atmos. Chem. Phys., 23, 7799–7822, https://doi.org/10.5194/acp-23-7799-2023, https://doi.org/10.5194/acp-23-7799-2023, 2023
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The applicability of photostationary steady-state (PSS) assumptions to estimate the amount of the sum of peroxy radicals (RO2*) during the EMeRGe airborne observations from the known radical chemistry and onboard measurements of RO2* precursors, photolysis frequencies, and other trace gases such as NOx and O3 was investigated. The comparison of the calculated RO2* with the actual measurements provides an insight into the main processes controlling their concentration in the air masses measured.
Hao Luo, Luc Vereecken, Hongru Shen, Sungah Kang, Iida Pullinen, Mattias Hallquist, Hendrik Fuchs, Andreas Wahner, Astrid Kiendler-Scharr, Thomas F. Mentel, and Defeng Zhao
Atmos. Chem. Phys., 23, 7297–7319, https://doi.org/10.5194/acp-23-7297-2023, https://doi.org/10.5194/acp-23-7297-2023, 2023
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Oxidation of limonene, an element emitted by trees and chemical products, by OH, a daytime oxidant, forms many highly oxygenated organic molecules (HOMs), including C10-20 compounds. HOMs play an important role in new particle formation and growth. HOM formation can be explained by the chemistry of peroxy radicals. We found that a minor branching ratio initial pathway plays an unexpected, significant role. Considering this pathway enables accurate simulations of HOMs and other concentrations.
Zaneta Hamryszczak, Dirk Dienhart, Bettina Brendel, Roland Rohloff, Daniel Marno, Monica Martinez, Hartwig Harder, Andrea Pozzer, Birger Bohn, Martin Zöger, Jos Lelieveld, and Horst Fischer
Atmos. Chem. Phys., 23, 5929–5943, https://doi.org/10.5194/acp-23-5929-2023, https://doi.org/10.5194/acp-23-5929-2023, 2023
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Hydrogen peroxide is a key contributor to the oxidative chemistry of the atmosphere through its link to the most prominent oxidants controlling its self-cleansing capacity, HOx. During the CAFE-Africa campaign, H2O2 was measured over the Atlantic Ocean and western Africa in August/September 2018. The study gives an overview of the distribution of H2O2 in the upper tropical troposphere and investigates the impact of convective processes in the Intertropical Convergence Zone on the budget of H2O2.
Joanna E. Dyson, Lisa K. Whalley, Eloise J. Slater, Robert Woodward-Massey, Chunxiang Ye, James D. Lee, Freya Squires, James R. Hopkins, Rachel E. Dunmore, Marvin Shaw, Jacqueline F. Hamilton, Alastair C. Lewis, Stephen D. Worrall, Asan Bacak, Archit Mehra, Thomas J. Bannan, Hugh Coe, Carl J. Percival, Bin Ouyang, C. Nicholas Hewitt, Roderic L. Jones, Leigh R. Crilley, Louisa J. Kramer, W. Joe F. Acton, William J. Bloss, Supattarachai Saksakulkrai, Jingsha Xu, Zongbo Shi, Roy M. Harrison, Simone Kotthaus, Sue Grimmond, Yele Sun, Weiqi Xu, Siyao Yue, Lianfang Wei, Pingqing Fu, Xinming Wang, Stephen R. Arnold, and Dwayne E. Heard
Atmos. Chem. Phys., 23, 5679–5697, https://doi.org/10.5194/acp-23-5679-2023, https://doi.org/10.5194/acp-23-5679-2023, 2023
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The hydroxyl (OH) and closely coupled hydroperoxyl (HO2) radicals are vital for their role in the removal of atmospheric pollutants. In less polluted regions, atmospheric models over-predict HO2 concentrations. In this modelling study, the impact of heterogeneous uptake of HO2 onto aerosol surfaces on radical concentrations and the ozone production regime in Beijing in the summertime is investigated, and the implications for emissions policies across China are considered.
Kezia Lange, Andreas Richter, Anja Schönhardt, Andreas C. Meier, Tim Bösch, André Seyler, Kai Krause, Lisa K. Behrens, Folkard Wittrock, Alexis Merlaud, Frederik Tack, Caroline Fayt, Martina M. Friedrich, Ermioni Dimitropoulou, Michel Van Roozendael, Vinod Kumar, Sebastian Donner, Steffen Dörner, Bianca Lauster, Maria Razi, Christian Borger, Katharina Uhlmannsiek, Thomas Wagner, Thomas Ruhtz, Henk Eskes, Birger Bohn, Daniel Santana Diaz, Nader Abuhassan, Dirk Schüttemeyer, and John P. Burrows
Atmos. Meas. Tech., 16, 1357–1389, https://doi.org/10.5194/amt-16-1357-2023, https://doi.org/10.5194/amt-16-1357-2023, 2023
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We present airborne imaging DOAS and ground-based stationary and car DOAS measurements conducted during the S5P-VAL-DE-Ruhr campaign in the Rhine-Ruhr region. The measurements are used to validate spaceborne NO2 data products from the Sentinel-5 Precursor TROPOspheric Monitoring Instrument (TROPOMI). Auxiliary data of the TROPOMI NO2 retrieval, such as spatially higher resolved a priori NO2 vertical profiles, surface reflectivity, and cloud treatment are investigated to evaluate their impact.
Philip T. M. Carlsson, Luc Vereecken, Anna Novelli, François Bernard, Steven S. Brown, Bellamy Brownwood, Changmin Cho, John N. Crowley, Patrick Dewald, Peter M. Edwards, Nils Friedrich, Juliane L. Fry, Mattias Hallquist, Luisa Hantschke, Thorsten Hohaus, Sungah Kang, Jonathan Liebmann, Alfred W. Mayhew, Thomas Mentel, David Reimer, Franz Rohrer, Justin Shenolikar, Ralf Tillmann, Epameinondas Tsiligiannis, Rongrong Wu, Andreas Wahner, Astrid Kiendler-Scharr, and Hendrik Fuchs
Atmos. Chem. Phys., 23, 3147–3180, https://doi.org/10.5194/acp-23-3147-2023, https://doi.org/10.5194/acp-23-3147-2023, 2023
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The investigation of the night-time oxidation of the most abundant hydrocarbon, isoprene, in chamber experiments shows the importance of reaction pathways leading to epoxy products, which could enhance particle formation, that have so far not been accounted for. The chemical lifetime of organic nitrates from isoprene is long enough for the majority to be further oxidized the next day by daytime oxidants.
Chuan-Yao Lin, Wan-Chin Chen, Yi-Yun Chien, Charles C. K. Chou, Chian-Yi Liu, Helmut Ziereis, Hans Schlager, Eric Förster, Florian Obersteiner, Ovid O. Krüger, Bruna A. Holanda, Mira L. Pöhlker, Katharina Kaiser, Johannes Schneider, Birger Bohn, Klaus Pfeilsticker, Benjamin Weyland, Maria Dolores Andrés Hernández, and John P. Burrows
Atmos. Chem. Phys., 23, 2627–2647, https://doi.org/10.5194/acp-23-2627-2023, https://doi.org/10.5194/acp-23-2627-2023, 2023
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During the EMeRGe campaign in Asia, atmospheric pollutants were measured on board the HALO aircraft. The WRF-Chem model was employed to evaluate the biomass burning (BB) plume transported from Indochina and its impact on the downstream areas. The combination of BB aerosol enhancement with cloud water resulted in a reduction in incoming shortwave radiation at the surface in southern China and the East China Sea, which potentially has significant regional climate implications.
Amir H. Souri, Matthew S. Johnson, Glenn M. Wolfe, James H. Crawford, Alan Fried, Armin Wisthaler, William H. Brune, Donald R. Blake, Andrew J. Weinheimer, Tijl Verhoelst, Steven Compernolle, Gaia Pinardi, Corinne Vigouroux, Bavo Langerock, Sungyeon Choi, Lok Lamsal, Lei Zhu, Shuai Sun, Ronald C. Cohen, Kyung-Eun Min, Changmin Cho, Sajeev Philip, Xiong Liu, and Kelly Chance
Atmos. Chem. Phys., 23, 1963–1986, https://doi.org/10.5194/acp-23-1963-2023, https://doi.org/10.5194/acp-23-1963-2023, 2023
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We have rigorously characterized different sources of error in satellite-based HCHO / NO2 tropospheric columns, a widely used metric for diagnosing near-surface ozone sensitivity. Specifically, the errors were categorized/quantified into (i) an inherent chemistry error, (ii) the decoupled relationship between columns and the near-surface concentration, (iii) the spatial representativeness error of ground satellite pixels, and (iv) the satellite retrieval errors.
Tobias Schuldt, Georgios I. Gkatzelis, Christian Wesolek, Franz Rohrer, Benjamin Winter, Thomas A. J. Kuhlbusch, Astrid Kiendler-Scharr, and Ralf Tillmann
Atmos. Meas. Tech., 16, 373–386, https://doi.org/10.5194/amt-16-373-2023, https://doi.org/10.5194/amt-16-373-2023, 2023
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We report in situ measurements of air pollutant concentrations within the planetary boundary layer on board a Zeppelin NT in Germany. We highlight the in-flight evaluation of electrochemical sensors that were installed inside a hatch box located on the bottom of the Zeppelin. Results from this work emphasize the potential of these sensors for other in situ airborne applications, e.g., on board unmanned aerial vehicles (UAVs).
Birger Bohn and Insa Lohse
Atmos. Meas. Tech., 16, 209–233, https://doi.org/10.5194/amt-16-209-2023, https://doi.org/10.5194/amt-16-209-2023, 2023
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Optical receivers for solar spectral actinic radiation are designed for angle-independent sensitivities within a hemisphere. Remaining imperfections can be compensated for by receiver-specific corrections based on laboratory characterizations and radiative transfer calculations of spectral radiance distributions. The corrections cover a wide range of realistic atmospheric conditions and were applied to ground-based and airborne measurements in a wavelength range 280–660 nm.
Zhaofeng Tan, Hendrik Fuchs, Andreas Hofzumahaus, William J. Bloss, Birger Bohn, Changmin Cho, Thorsten Hohaus, Frank Holland, Chandrakiran Lakshmisha, Lu Liu, Paul S. Monks, Anna Novelli, Doreen Niether, Franz Rohrer, Ralf Tillmann, Thalassa S. E. Valkenburg, Vaishali Vardhan, Astrid Kiendler-Scharr, Andreas Wahner, and Roberto Sommariva
Atmos. Chem. Phys., 22, 13137–13152, https://doi.org/10.5194/acp-22-13137-2022, https://doi.org/10.5194/acp-22-13137-2022, 2022
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During the 2019 JULIAC campaign, ClNO2 was measured at a rural site in Germany in different seasons. The highest ClNO2 level was 1.6 ppbv in September. ClNO2 production was more sensitive to the availability of NO2 than O3. The average ClNO2 production efficiency was up to 18 % in February and September and down to 3 % in December. These numbers are at the high end of the values reported in the literature, indicating the importance of ClNO2 chemistry in rural environments in midwestern Europe.
Xinping Yang, Keding Lu, Xuefei Ma, Yue Gao, Zhaofeng Tan, Haichao Wang, Xiaorui Chen, Xin Li, Xiaofeng Huang, Lingyan He, Mengxue Tang, Bo Zhu, Shiyi Chen, Huabin Dong, Limin Zeng, and Yuanhang Zhang
Atmos. Chem. Phys., 22, 12525–12542, https://doi.org/10.5194/acp-22-12525-2022, https://doi.org/10.5194/acp-22-12525-2022, 2022
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We present the OH and HO2 radical observations at the Shenzhen site (Pearl River Delta, China) in the autumn of 2018. The diurnal maxima were 4.5 × 106 cm−3 for OH and 4.2 × 108 cm−3 for HO2 (including an estimated interference of 23 %–28 % from RO2 radicals during the daytime). The OH underestimation was identified again, and it was attributable to the missing OH sources. HO2 heterogeneous uptake, ROx sources and sinks, and the atmospheric oxidation capacity were evaluated as well.
Yindong Guo, Hongru Shen, Iida Pullinen, Hao Luo, Sungah Kang, Luc Vereecken, Hendrik Fuchs, Mattias Hallquist, Ismail-Hakki Acir, Ralf Tillmann, Franz Rohrer, Jürgen Wildt, Astrid Kiendler-Scharr, Andreas Wahner, Defeng Zhao, and Thomas F. Mentel
Atmos. Chem. Phys., 22, 11323–11346, https://doi.org/10.5194/acp-22-11323-2022, https://doi.org/10.5194/acp-22-11323-2022, 2022
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The oxidation of limonene, a common volatile emitted by trees and chemical products, by NO3, a nighttime oxidant, forms many highly oxygenated organic molecules (HOM), including C10-30 compounds. Most of the HOM are second-generation organic nitrates, in which carbonyl-substituted C10 nitrates accounted for a major fraction. Their formation can be explained by chemistry of peroxy radicals. HOM, especially low-volatile ones, play an important role in nighttime new particle formation and growth.
Simon F. Reifenberg, Anna Martin, Matthias Kohl, Sara Bacer, Zaneta Hamryszczak, Ivan Tadic, Lenard Röder, Daniel J. Crowley, Horst Fischer, Katharina Kaiser, Johannes Schneider, Raphael Dörich, John N. Crowley, Laura Tomsche, Andreas Marsing, Christiane Voigt, Andreas Zahn, Christopher Pöhlker, Bruna A. Holanda, Ovid Krüger, Ulrich Pöschl, Mira Pöhlker, Patrick Jöckel, Marcel Dorf, Ulrich Schumann, Jonathan Williams, Birger Bohn, Joachim Curtius, Hardwig Harder, Hans Schlager, Jos Lelieveld, and Andrea Pozzer
Atmos. Chem. Phys., 22, 10901–10917, https://doi.org/10.5194/acp-22-10901-2022, https://doi.org/10.5194/acp-22-10901-2022, 2022
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In this work we use a combination of observational data from an aircraft campaign and model results to investigate the effect of the European lockdown due to COVID-19 in spring 2020. Using model results, we show that the largest relative changes to the atmospheric composition caused by the reduced emissions are located in the upper troposphere around aircraft cruise altitude, while the largest absolute changes are present at the surface.
Woohui Nam, Changmin Cho, Begie Perdigones, Tae Siek Rhee, and Kyung-Eun Min
Atmos. Meas. Tech., 15, 4473–4487, https://doi.org/10.5194/amt-15-4473-2022, https://doi.org/10.5194/amt-15-4473-2022, 2022
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We describe our vibration-resistant instrument for measuring ambient NO3, NO2, and H2O based on cavity-enhanced absorption spectroscopy. By simultaneous retrieval of H2O with the other species using a measured H2O absorption spectrum, direct quantifications among all species are possible without any pre-treatment for H2O. Our instrument achieves the effective light path to ~101.5 km, which allows the sensitive measurements of NO3 and NO2 as 1.41 pptv and 6.92 ppbv (1σ) in 1 s.
Zaneta T. Hamryszczak, Andrea Pozzer, Florian Obersteiner, Birger Bohn, Benedikt Steil, Jos Lelieveld, and Horst Fischer
Atmos. Chem. Phys., 22, 9483–9497, https://doi.org/10.5194/acp-22-9483-2022, https://doi.org/10.5194/acp-22-9483-2022, 2022
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Hydrogen peroxide plays a pivotal role in the chemistry of the atmosphere. Together with organic hydroperoxides, it forms a reservoir for peroxy radicals, which are known to be the key contributors to the self-cleaning processes of the atmosphere. Hydroperoxides were measured over Europe during the BLUESKY campaign in May–June 2020. The paper gives an overview of the distribution of the species in the troposphere and investigates the impact of wet scavenging and deposition on the budget of H2O2.
Jacky Yat Sing Pang, Anna Novelli, Martin Kaminski, Ismail-Hakki Acir, Birger Bohn, Philip T. M. Carlsson, Changmin Cho, Hans-Peter Dorn, Andreas Hofzumahaus, Xin Li, Anna Lutz, Sascha Nehr, David Reimer, Franz Rohrer, Ralf Tillmann, Robert Wegener, Astrid Kiendler-Scharr, Andreas Wahner, and Hendrik Fuchs
Atmos. Chem. Phys., 22, 8497–8527, https://doi.org/10.5194/acp-22-8497-2022, https://doi.org/10.5194/acp-22-8497-2022, 2022
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This study investigates the radical chemical budget during the limonene oxidation at different atmospheric-relevant NO concentrations in chamber experiments under atmospheric conditions. It is found that the model–measurement discrepancies of HO2 and RO2 are very large at low NO concentrations that are typical for forested environments. Possible additional processes impacting HO2 and RO2 concentrations are discussed.
Ralf Tillmann, Georgios I. Gkatzelis, Franz Rohrer, Benjamin Winter, Christian Wesolek, Tobias Schuldt, Anne C. Lange, Philipp Franke, Elmar Friese, Michael Decker, Robert Wegener, Morten Hundt, Oleg Aseev, and Astrid Kiendler-Scharr
Atmos. Meas. Tech., 15, 3827–3842, https://doi.org/10.5194/amt-15-3827-2022, https://doi.org/10.5194/amt-15-3827-2022, 2022
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We report in situ measurements of air pollutant concentrations within the planetary boundary layer on board a Zeppelin in Germany. The low costs of commercial flights provide an affordable and efficient method to improve our understanding of changes in emissions in space and time. The experimental setup expands the capabilities of this platform and provides insights into primary and secondary pollution observations and planetary boundary layer dynamics which determine air quality significantly.
Marios Panagi, Roberto Sommariva, Zoë L. Fleming, Paul S. Monks, Gongda Lu, Eloise A. Marais, James R. Hopkins, Alastair C. Lewis, Qiang Zhang, James D. Lee, Freya A. Squires, Lisa K. Whalley, Eloise J. Slater, Dwayne E. Heard, Robert Woodward-Massey, Chunxiang Ye, and Joshua D. Vande Hey
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-379, https://doi.org/10.5194/acp-2022-379, 2022
Revised manuscript not accepted
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A dispersion model and a box model were combined to investigate the evolution of VOCs in Beijing once they are emitted from anthropogenic sources. It was determined that during the winter time the VOC concentrations in Beijing are driven predominantly by sources within Beijing and by a combination of transport and chemistry during the summer. Furthermore, the results in the paper highlight the need for a season specific policy.
Xuefei Ma, Zhaofeng Tan, Keding Lu, Xinping Yang, Xiaorui Chen, Haichao Wang, Shiyi Chen, Xin Fang, Shule Li, Xin Li, Jingwei Liu, Ying Liu, Shengrong Lou, Wanyi Qiu, Hongli Wang, Limin Zeng, and Yuanhang Zhang
Atmos. Chem. Phys., 22, 7005–7028, https://doi.org/10.5194/acp-22-7005-2022, https://doi.org/10.5194/acp-22-7005-2022, 2022
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This paper presents the first OH and HO2 radical observations made in the Yangtze River Delta in China, and strong oxidation capacity is discovered based on direct measurements. The impacts of new OH regeneration mechanisms, monoterpene oxidation, and HO2 uptake processes are examined and discussed. The sources and the factors to sustain such strong oxidation are the key to understanding the ozone pollution formed in this area.
M. Dolores Andrés Hernández, Andreas Hilboll, Helmut Ziereis, Eric Förster, Ovid O. Krüger, Katharina Kaiser, Johannes Schneider, Francesca Barnaba, Mihalis Vrekoussis, Jörg Schmidt, Heidi Huntrieser, Anne-Marlene Blechschmidt, Midhun George, Vladyslav Nenakhov, Theresa Harlass, Bruna A. Holanda, Jennifer Wolf, Lisa Eirenschmalz, Marc Krebsbach, Mira L. Pöhlker, Anna B. Kalisz Hedegaard, Linlu Mei, Klaus Pfeilsticker, Yangzhuoran Liu, Ralf Koppmann, Hans Schlager, Birger Bohn, Ulrich Schumann, Andreas Richter, Benjamin Schreiner, Daniel Sauer, Robert Baumann, Mariano Mertens, Patrick Jöckel, Markus Kilian, Greta Stratmann, Christopher Pöhlker, Monica Campanelli, Marco Pandolfi, Michael Sicard, José L. Gómez-Amo, Manuel Pujadas, Katja Bigge, Flora Kluge, Anja Schwarz, Nikos Daskalakis, David Walter, Andreas Zahn, Ulrich Pöschl, Harald Bönisch, Stephan Borrmann, Ulrich Platt, and John P. Burrows
Atmos. Chem. Phys., 22, 5877–5924, https://doi.org/10.5194/acp-22-5877-2022, https://doi.org/10.5194/acp-22-5877-2022, 2022
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EMeRGe provides a unique set of in situ and remote sensing airborne measurements of trace gases and aerosol particles along selected flight routes in the lower troposphere over Europe. The interpretation uses also complementary collocated ground-based and satellite measurements. The collected data help to improve the current understanding of the complex spatial distribution of trace gases and aerosol particles resulting from mixing, transport, and transformation of pollution plumes over Europe.
Ülkü Alver Şahin, Roy M. Harrison, Mohammed S. Alam, David C. S. Beddows, Dimitrios Bousiotis, Zongbo Shi, Leigh R. Crilley, William Bloss, James Brean, Isha Khanna, and Rulan Verma
Atmos. Chem. Phys., 22, 5415–5433, https://doi.org/10.5194/acp-22-5415-2022, https://doi.org/10.5194/acp-22-5415-2022, 2022
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Wide-range particle size spectra have been measured in three seasons in Delhi and are interpreted in terms of sources and processes. Condensational growth is a major feature of the fine fraction, and a coarse fraction contributes substantially – but only in summer.
Robert Woodward-Massey, Roberto Sommariva, Lisa K. Whalley, Danny R. Cryer, Trevor Ingham, William J1 Bloss, Sam Cox, James D. Lee, Chris P. Reed, Leigh R. Crilley, Louisa J. Kramer, Brian J. Bandy, Grant L. Forster, Claire E. Reeves, Paul S. Monks, and Dwayne E. Heard
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-207, https://doi.org/10.5194/acp-2022-207, 2022
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We measured radicals (OH, HO2, RO2) and OH reactivity at a UK coastal site and compared our observations to the predictions of an MCMv3.3.1 box model. We find variable agreement between measured and modelled radical concentrations and OH reactivity, where the levels of agreement for individual species display strong dependences on NO concentrations. The most substantial disagreement is found for RO2 at high NO (> 1 ppbv), when RO2 levels are underpredicted by a factor of ~10–30.
Andrea Pozzer, Simon F. Reifenberg, Vinod Kumar, Bruno Franco, Matthias Kohl, Domenico Taraborrelli, Sergey Gromov, Sebastian Ehrhart, Patrick Jöckel, Rolf Sander, Veronica Fall, Simon Rosanka, Vlassis Karydis, Dimitris Akritidis, Tamara Emmerichs, Monica Crippa, Diego Guizzardi, Johannes W. Kaiser, Lieven Clarisse, Astrid Kiendler-Scharr, Holger Tost, and Alexandra Tsimpidi
Geosci. Model Dev., 15, 2673–2710, https://doi.org/10.5194/gmd-15-2673-2022, https://doi.org/10.5194/gmd-15-2673-2022, 2022
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A newly developed setup of the chemistry general circulation model EMAC (ECHAM5/MESSy for Atmospheric Chemistry) is evaluated here. A comprehensive organic degradation mechanism is used and coupled with a volatility base model.
The results show that the model reproduces most of the tracers and aerosols satisfactorily but shows discrepancies for oxygenated organic gases. It is also shown that this model configuration can be used for further research in atmospheric chemistry.
Sophie Dixneuf, Albert A. Ruth, Rolf Häseler, Theo Brauers, Franz Rohrer, and Hans-Peter Dorn
Atmos. Meas. Tech., 15, 945–964, https://doi.org/10.5194/amt-15-945-2022, https://doi.org/10.5194/amt-15-945-2022, 2022
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Atmospheric chambers, like SAPHIR in Jülich (Germany), are used to experimentally simulate specific atmospheric scenarios to improve our understanding of the complex chemical reactions occurring in our atmospheres. These facilities hence require cutting-edge gas-sensing capabilities to detect trace gases at the lowest level and in a short time. One important trace gas is HONO, for which we custom-built an optical sensing setup, capable of detecting one HONO molecule in ~40 billion in 1 min.
Zhi-Hui Zhang, Elena Hartner, Battist Utinger, Benjamin Gfeller, Andreas Paul, Martin Sklorz, Hendryk Czech, Bin Xia Yang, Xin Yi Su, Gert Jakobi, Jürgen Orasche, Jürgen Schnelle-Kreis, Seongho Jeong, Thomas Gröger, Michal Pardo, Thorsten Hohaus, Thomas Adam, Astrid Kiendler-Scharr, Yinon Rudich, Ralf Zimmermann, and Markus Kalberer
Atmos. Chem. Phys., 22, 1793–1809, https://doi.org/10.5194/acp-22-1793-2022, https://doi.org/10.5194/acp-22-1793-2022, 2022
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Using a novel setup, we comprehensively characterized the formation of particle-bound reactive oxygen species (ROS) in anthropogenic and biogenic secondary organic aerosols (SOAs). We found that more than 90 % of all ROS components in both SOA types have a short lifetime. Our results also show that photochemical aging promotes particle-bound ROS production and enhances the oxidative potential of the aerosols. We found consistent results between chemical-based and biological-based ROS analyses.
Dongwook Kim, Changmin Cho, Seokhan Jeong, Soojin Lee, Benjamin A. Nault, Pedro Campuzano-Jost, Douglas A. Day, Jason C. Schroder, Jose L. Jimenez, Rainer Volkamer, Donald R. Blake, Armin Wisthaler, Alan Fried, Joshua P. DiGangi, Glenn S. Diskin, Sally E. Pusede, Samuel R. Hall, Kirk Ullmann, L. Gregory Huey, David J. Tanner, Jack Dibb, Christoph J. Knote, and Kyung-Eun Min
Atmos. Chem. Phys., 22, 805–821, https://doi.org/10.5194/acp-22-805-2022, https://doi.org/10.5194/acp-22-805-2022, 2022
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CHOCHO was simulated using a 0-D box model constrained by measurements during the KORUS-AQ mission. CHOCHO concentration was high in large cities, aromatics being the most important precursors. Loss path to aerosol was the highest sink, contributing to ~ 20 % of secondary organic aerosol formation. Our work highlights that simple CHOCHO surface uptake approach is valid only for low aerosol conditions and more work is required to understand CHOCHO solubility in high-aerosol conditions.
Clara M. Nussbaumer, John N. Crowley, Jan Schuladen, Jonathan Williams, Sascha Hafermann, Andreas Reiffs, Raoul Axinte, Hartwig Harder, Cheryl Ernest, Anna Novelli, Katrin Sala, Monica Martinez, Chinmay Mallik, Laura Tomsche, Christian Plass-Dülmer, Birger Bohn, Jos Lelieveld, and Horst Fischer
Atmos. Chem. Phys., 21, 18413–18432, https://doi.org/10.5194/acp-21-18413-2021, https://doi.org/10.5194/acp-21-18413-2021, 2021
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HCHO is an important atmospheric trace gas influencing the photochemical processes in the Earth’s atmosphere, including the budget of HOx and the abundance of tropospheric O3. This research presents the photochemical calculations of HCHO and O3 based on three field campaigns across Europe. We show that HCHO production via the oxidation of only four volatile organic compound precursors, i.e., CH4, CH3CHO, C5H8 and CH3OH, can balance the observed loss at all sites well.
Leigh R. Crilley, Louisa J. Kramer, Francis D. Pope, Chris Reed, James D. Lee, Lucy J. Carpenter, Lloyd D. J. Hollis, Stephen M. Ball, and William J. Bloss
Atmos. Chem. Phys., 21, 18213–18225, https://doi.org/10.5194/acp-21-18213-2021, https://doi.org/10.5194/acp-21-18213-2021, 2021
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Nitrous acid (HONO) is a key source of atmospheric oxidants. We evaluate if the ocean surface is a source of HONO for the marine boundary layer, using measurements from two contrasting coastal locations. We observed no evidence for a night-time ocean surface source, in contrast to previous work. This points to significant geographical variation in the predominant HONO formation mechanisms in marine environments, reflecting possible variability in the sea-surface microlayer composition.
Zhaofeng Tan, Luisa Hantschke, Martin Kaminski, Ismail-Hakki Acir, Birger Bohn, Changmin Cho, Hans-Peter Dorn, Xin Li, Anna Novelli, Sascha Nehr, Franz Rohrer, Ralf Tillmann, Robert Wegener, Andreas Hofzumahaus, Astrid Kiendler-Scharr, Andreas Wahner, and Hendrik Fuchs
Atmos. Chem. Phys., 21, 16067–16091, https://doi.org/10.5194/acp-21-16067-2021, https://doi.org/10.5194/acp-21-16067-2021, 2021
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The photo-oxidation of myrcene, a monoterpene species emitted by plants, was investigated at atmospheric conditions in the outdoor simulation chamber SAPHIR. The chemical structure of myrcene is partly similar to isoprene. Therefore, it can be expected that hydrogen shift reactions could play a role as observed for isoprene. In this work, their potential impact on the regeneration efficiency of hydroxyl radicals is investigated.
Clara M. Nussbaumer, Uwe Parchatka, Ivan Tadic, Birger Bohn, Daniel Marno, Monica Martinez, Roland Rohloff, Hartwig Harder, Flora Kluge, Klaus Pfeilsticker, Florian Obersteiner, Martin Zöger, Raphael Doerich, John N. Crowley, Jos Lelieveld, and Horst Fischer
Atmos. Meas. Tech., 14, 6759–6776, https://doi.org/10.5194/amt-14-6759-2021, https://doi.org/10.5194/amt-14-6759-2021, 2021
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NO2 plays a central role in atmospheric photochemical processes and requires accurate measurements. This research presents NO2 data obtained via chemiluminescence using a photolytic converter from airborne studies around Cabo Verde and laboratory investigations. We show the limits and error-proneness of a conventional blue light converter in aircraft measurements affected by humidity and NO levels and suggest the use of an alternative quartz converter for more reliable results.
Beth S. Nelson, Gareth J. Stewart, Will S. Drysdale, Mike J. Newland, Adam R. Vaughan, Rachel E. Dunmore, Pete M. Edwards, Alastair C. Lewis, Jacqueline F. Hamilton, W. Joe Acton, C. Nicholas Hewitt, Leigh R. Crilley, Mohammed S. Alam, Ülkü A. Şahin, David C. S. Beddows, William J. Bloss, Eloise Slater, Lisa K. Whalley, Dwayne E. Heard, James M. Cash, Ben Langford, Eiko Nemitz, Roberto Sommariva, Sam Cox, Shivani, Ranu Gadi, Bhola R. Gurjar, James R. Hopkins, Andrew R. Rickard, and James D. Lee
Atmos. Chem. Phys., 21, 13609–13630, https://doi.org/10.5194/acp-21-13609-2021, https://doi.org/10.5194/acp-21-13609-2021, 2021
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Ozone production at an urban site in Delhi is sensitive to volatile organic compound (VOC) concentrations, particularly those of the aromatic, monoterpene, and alkene VOC classes. The change in ozone production by varying atmospheric pollutants according to their sources, as defined in an emissions inventory, is investigated. The study suggests that reducing road transport emissions alone does not reduce reactive VOCs in the atmosphere enough to perturb an increase in ozone production.
Paul S. Monks, A. R. Ravishankara, Erika von Schneidemesser, and Roberto Sommariva
Atmos. Chem. Phys., 21, 12909–12948, https://doi.org/10.5194/acp-21-12909-2021, https://doi.org/10.5194/acp-21-12909-2021, 2021
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Which published papers have transformed our understanding of the chemical processes in the troposphere and shaped the field of atmospheric chemistry? We explore how these papers have shaped the development of the field of atmospheric chemistry and identify the major landmarks in the field of atmospheric chemistry through the lens of those papers' impact on science, legislation and environmental events.
Janne Lampilahti, Hanna E. Manninen, Tuomo Nieminen, Sander Mirme, Mikael Ehn, Iida Pullinen, Katri Leino, Siegfried Schobesberger, Juha Kangasluoma, Jenni Kontkanen, Emma Järvinen, Riikka Väänänen, Taina Yli-Juuti, Radovan Krejci, Katrianne Lehtipalo, Janne Levula, Aadu Mirme, Stefano Decesari, Ralf Tillmann, Douglas R. Worsnop, Franz Rohrer, Astrid Kiendler-Scharr, Tuukka Petäjä, Veli-Matti Kerminen, Thomas F. Mentel, and Markku Kulmala
Atmos. Chem. Phys., 21, 12649–12663, https://doi.org/10.5194/acp-21-12649-2021, https://doi.org/10.5194/acp-21-12649-2021, 2021
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We studied aerosol particle formation and growth in different parts of the planetary boundary layer at two different locations (Po Valley, Italy, and Hyytiälä, Finland). The observations consist of airborne measurements on board an instrumented Zeppelin and a small airplane combined with comprehensive ground-based measurements.
Luisa Hantschke, Anna Novelli, Birger Bohn, Changmin Cho, David Reimer, Franz Rohrer, Ralf Tillmann, Marvin Glowania, Andreas Hofzumahaus, Astrid Kiendler-Scharr, Andreas Wahner, and Hendrik Fuchs
Atmos. Chem. Phys., 21, 12665–12685, https://doi.org/10.5194/acp-21-12665-2021, https://doi.org/10.5194/acp-21-12665-2021, 2021
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The reactions of Δ3-carene with ozone and the hydroxyl radical (OH) and the photolysis and OH reaction of caronaldehyde were investigated in the simulation chamber SAPHIR. Reaction rate constants of these reactions were determined. Caronaldehyde yields of the ozonolysis and OH reaction were determined. The organic nitrate yield of the reaction of Δ3-carene and caronaldehyde-derived peroxy radicals with NO was determined. The ROx budget (ROx = OH+HO2+RO2) was also investigated.
Simon Rosanka, Bruno Franco, Lieven Clarisse, Pierre-François Coheur, Andrea Pozzer, Andreas Wahner, and Domenico Taraborrelli
Atmos. Chem. Phys., 21, 11257–11288, https://doi.org/10.5194/acp-21-11257-2021, https://doi.org/10.5194/acp-21-11257-2021, 2021
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The strong El Niño in 2015 led to a particular dry season in Indonesia and favoured severe peatland fires. The smouldering conditions of these fires and the high carbon content of peat resulted in high volatile organic compound (VOC) emissions. By using a comprehensive atmospheric model, we show that these emissions have a significant impact on the tropospheric composition and oxidation capacity. These emissions are transported into to the lower stratosphere, resulting in a depletion of ozone.
Rongrong Wu, Luc Vereecken, Epameinondas Tsiligiannis, Sungah Kang, Sascha R. Albrecht, Luisa Hantschke, Defeng Zhao, Anna Novelli, Hendrik Fuchs, Ralf Tillmann, Thorsten Hohaus, Philip T. M. Carlsson, Justin Shenolikar, François Bernard, John N. Crowley, Juliane L. Fry, Bellamy Brownwood, Joel A. Thornton, Steven S. Brown, Astrid Kiendler-Scharr, Andreas Wahner, Mattias Hallquist, and Thomas F. Mentel
Atmos. Chem. Phys., 21, 10799–10824, https://doi.org/10.5194/acp-21-10799-2021, https://doi.org/10.5194/acp-21-10799-2021, 2021
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Isoprene is the biogenic volatile organic compound with the largest emissions rates. The nighttime reaction of isoprene with the NO3 radical has a large potential to contribute to SOA. We classified isoprene nitrates into generations and proposed formation pathways. Considering the potential functionalization of the isoprene nitrates we propose that mainly isoprene dimers contribute to SOA formation from the isoprene NO3 reactions with at least a 5 % mass yield.
Simon Rosanka, Rolf Sander, Andreas Wahner, and Domenico Taraborrelli
Geosci. Model Dev., 14, 4103–4115, https://doi.org/10.5194/gmd-14-4103-2021, https://doi.org/10.5194/gmd-14-4103-2021, 2021
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The Jülich Aqueous-phase Mechanism of Organic Chemistry (JAMOC) is developed and implemented into the Module Efficiently Calculating the Chemistry of the Atmosphere (MECCA). JAMOC is an explicit in-cloud oxidation scheme for oxygenated volatile organic compounds (OVOCs), which is suitable for global model applications. Within a box-model study, we show that JAMOC yields reduced gas-phase concentrations of most OVOCs and oxidants, except for nitrogen oxides.
Simon Rosanka, Rolf Sander, Bruno Franco, Catherine Wespes, Andreas Wahner, and Domenico Taraborrelli
Atmos. Chem. Phys., 21, 9909–9930, https://doi.org/10.5194/acp-21-9909-2021, https://doi.org/10.5194/acp-21-9909-2021, 2021
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In-cloud destruction of ozone depends on hydroperoxyl radicals in cloud droplets, where they are produced by oxygenated volatile organic compound (OVOC) oxygenation. Only rudimentary representations of these processes, if any, are currently available in global atmospheric models. By using a comprehensive atmospheric model that includes a complex in-cloud OVOC oxidation scheme, we show that atmospheric oxidants are reduced and models ignoring this process will underpredict clouds as ozone sinks.
Defeng Zhao, Iida Pullinen, Hendrik Fuchs, Stephanie Schrade, Rongrong Wu, Ismail-Hakki Acir, Ralf Tillmann, Franz Rohrer, Jürgen Wildt, Yindong Guo, Astrid Kiendler-Scharr, Andreas Wahner, Sungah Kang, Luc Vereecken, and Thomas F. Mentel
Atmos. Chem. Phys., 21, 9681–9704, https://doi.org/10.5194/acp-21-9681-2021, https://doi.org/10.5194/acp-21-9681-2021, 2021
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The reaction of isoprene, a biogenic volatile organic compound with the globally largest emission rates, with NO3, an nighttime oxidant influenced heavily by anthropogenic emissions, forms a large number of highly oxygenated organic molecules (HOM). These HOM are formed via one or multiple oxidation steps, followed by autoxidation. Their total yield is much higher than that in the daytime oxidation of isoprene. They may play an important role in nighttime organic aerosol formation and growth.
Marvin Glowania, Franz Rohrer, Hans-Peter Dorn, Andreas Hofzumahaus, Frank Holland, Astrid Kiendler-Scharr, Andreas Wahner, and Hendrik Fuchs
Atmos. Meas. Tech., 14, 4239–4253, https://doi.org/10.5194/amt-14-4239-2021, https://doi.org/10.5194/amt-14-4239-2021, 2021
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Three instruments that use different techniques to measure gaseous formaldehyde concentrations were compared in experiments in the atmospheric simulation chamber SAPHIR at Forschungszentrum Jülich. The results demonstrated the need to correct the baseline in measurements by instruments that use the Hantzsch reaction or make use of cavity ring-down spectroscopy. After applying corrections, all three methods gave accurate and precise measurements within their specifications.
Ivan Tadic, Clara M. Nussbaumer, Birger Bohn, Hartwig Harder, Daniel Marno, Monica Martinez, Florian Obersteiner, Uwe Parchatka, Andrea Pozzer, Roland Rohloff, Martin Zöger, Jos Lelieveld, and Horst Fischer
Atmos. Chem. Phys., 21, 8195–8211, https://doi.org/10.5194/acp-21-8195-2021, https://doi.org/10.5194/acp-21-8195-2021, 2021
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Although mechanisms of tropospheric ozone (O3) formation are well understood, studies reporting on ozone formation derived from field measurements are challenging and remain sparse in number. We use airborne measurements to quantify nitric oxide (NO) and O3 distributions in the upper troposphere over the Atlantic Ocean and western Africa and compare our measurements to model simulations. Our results show that NO and ozone formation are greatest over the tropical areas of western Africa.
Karn Vohra, Eloise A. Marais, Shannen Suckra, Louisa Kramer, William J. Bloss, Ravi Sahu, Abhishek Gaur, Sachchida N. Tripathi, Martin Van Damme, Lieven Clarisse, and Pierre-F. Coheur
Atmos. Chem. Phys., 21, 6275–6296, https://doi.org/10.5194/acp-21-6275-2021, https://doi.org/10.5194/acp-21-6275-2021, 2021
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We find satellite observations of atmospheric composition generally reproduce variability in surface air pollution, so we use their long record to estimate air quality trends in major UK and Indian cities. Our trend analysis shows that pollutants targeted with air quality policies have not declined in Delhi and Kanpur but have in London and Birmingham, with the exception of a recent and dramatic increase in reactive volatile organics in London. Unregulated ammonia has increased only in Delhi.
Claire E. Reeves, Graham P. Mills, Lisa K. Whalley, W. Joe F. Acton, William J. Bloss, Leigh R. Crilley, Sue Grimmond, Dwayne E. Heard, C. Nicholas Hewitt, James R. Hopkins, Simone Kotthaus, Louisa J. Kramer, Roderic L. Jones, James D. Lee, Yanhui Liu, Bin Ouyang, Eloise Slater, Freya Squires, Xinming Wang, Robert Woodward-Massey, and Chunxiang Ye
Atmos. Chem. Phys., 21, 6315–6330, https://doi.org/10.5194/acp-21-6315-2021, https://doi.org/10.5194/acp-21-6315-2021, 2021
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The impact of isoprene on atmospheric chemistry is dependent on how its oxidation products interact with other pollutants, specifically nitrogen oxides. Such interactions can lead to isoprene nitrates. We made measurements of the concentrations of individual isoprene nitrate isomers in Beijing and used a model to test current understanding of their chemistry. We highlight areas of uncertainty in understanding, in particular the chemistry following oxidation of isoprene by the nitrate radical.
Clara Betancourt, Christoph Küppers, Tammarat Piansawan, Uta Sager, Andrea B. Hoyer, Heinz Kaminski, Gerhard Rapp, Astrid C. John, Miriam Küpper, Ulrich Quass, Thomas Kuhlbusch, Jochen Rudolph, Astrid Kiendler-Scharr, and Iulia Gensch
Atmos. Chem. Phys., 21, 5953–5964, https://doi.org/10.5194/acp-21-5953-2021, https://doi.org/10.5194/acp-21-5953-2021, 2021
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For the first time, we included stable isotopes in the Lagrangian particle dispersion model FLEXPART to investigate firewood home heating aerosol. This is an innovative source apportionment methodology since comparison of stable isotope ratio model predictions with observations delivers quantitative understanding of atmospheric processes. The main outcome of this study is that the home heating aerosol in residential areas was not of remote origin.
Steven J. Campbell, Kate Wolfer, Battist Utinger, Joe Westwood, Zhi-Hui Zhang, Nicolas Bukowiecki, Sarah S. Steimer, Tuan V. Vu, Jingsha Xu, Nicholas Straw, Steven Thomson, Atallah Elzein, Yele Sun, Di Liu, Linjie Li, Pingqing Fu, Alastair C. Lewis, Roy M. Harrison, William J. Bloss, Miranda Loh, Mark R. Miller, Zongbo Shi, and Markus Kalberer
Atmos. Chem. Phys., 21, 5549–5573, https://doi.org/10.5194/acp-21-5549-2021, https://doi.org/10.5194/acp-21-5549-2021, 2021
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In this study, we quantify PM2.5 oxidative potential (OP), a metric widely suggested as a potential measure of particle toxicity, in Beijing in summer and winter using four acellular assays. We correlate PM2.5 OP with a comprehensive range of atmospheric and particle composition measurements, demonstrating inter-assay differences and seasonal variation of PM2.5 OP. Using multivariate statistical analysis, we highlight specific particle chemical components and sources that influence OP.
Alexander Zaytsev, Martin Breitenlechner, Anna Novelli, Hendrik Fuchs, Daniel A. Knopf, Jesse H. Kroll, and Frank N. Keutsch
Atmos. Meas. Tech., 14, 2501–2513, https://doi.org/10.5194/amt-14-2501-2021, https://doi.org/10.5194/amt-14-2501-2021, 2021
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We have developed an online method for speciated measurements of organic peroxy radicals and stabilized Criegee intermediates using chemical derivatization combined with chemical ionization mass spectrometry. Chemical derivatization prevents secondary radical reactions and eliminates potential interferences. Comparison between our measurements and results from numeric modeling shows that the method can be used for the quantification of a wide range of atmospheric radicals and intermediates.
Michael Priestley, Thomas J. Bannan, Michael Le Breton, Stephen D. Worrall, Sungah Kang, Iida Pullinen, Sebastian Schmitt, Ralf Tillmann, Einhard Kleist, Defeng Zhao, Jürgen Wildt, Olga Garmash, Archit Mehra, Asan Bacak, Dudley E. Shallcross, Astrid Kiendler-Scharr, Åsa M. Hallquist, Mikael Ehn, Hugh Coe, Carl J. Percival, Mattias Hallquist, Thomas F. Mentel, and Gordon McFiggans
Atmos. Chem. Phys., 21, 3473–3490, https://doi.org/10.5194/acp-21-3473-2021, https://doi.org/10.5194/acp-21-3473-2021, 2021
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A significant fraction of emissions from human activity consists of aromatic hydrocarbons, e.g. benzene, which oxidise to form new compounds important for particle growth. Characterisation of benzene oxidation products highlights the range of species produced as well as their chemical properties and contextualises them within relevant frameworks, e.g. MCM. Cluster analysis of the oxidation product time series distinguishes behaviours of CHON compounds that could aid in identifying functionality.
Changmin Cho, Andreas Hofzumahaus, Hendrik Fuchs, Hans-Peter Dorn, Marvin Glowania, Frank Holland, Franz Rohrer, Vaishali Vardhan, Astrid Kiendler-Scharr, Andreas Wahner, and Anna Novelli
Atmos. Meas. Tech., 14, 1851–1877, https://doi.org/10.5194/amt-14-1851-2021, https://doi.org/10.5194/amt-14-1851-2021, 2021
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This study describes the implementation and characterization of the chemical modulation reactor (CMR) used in the laser-induced fluorescence instrument of the Forschungszentrum Jülich. The CMR allows for interference-free OH radical measurement in ambient air. During a field campaign in a rural environment, the observed interference was mostly below the detection limit of the instrument and fully explained by the known ozone interference.
Lisa K. Whalley, Eloise J. Slater, Robert Woodward-Massey, Chunxiang Ye, James D. Lee, Freya Squires, James R. Hopkins, Rachel E. Dunmore, Marvin Shaw, Jacqueline F. Hamilton, Alastair C. Lewis, Archit Mehra, Stephen D. Worrall, Asan Bacak, Thomas J. Bannan, Hugh Coe, Carl J. Percival, Bin Ouyang, Roderic L. Jones, Leigh R. Crilley, Louisa J. Kramer, William J. Bloss, Tuan Vu, Simone Kotthaus, Sue Grimmond, Yele Sun, Weiqi Xu, Siyao Yue, Lujie Ren, W. Joe F. Acton, C. Nicholas Hewitt, Xinming Wang, Pingqing Fu, and Dwayne E. Heard
Atmos. Chem. Phys., 21, 2125–2147, https://doi.org/10.5194/acp-21-2125-2021, https://doi.org/10.5194/acp-21-2125-2021, 2021
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To understand how emission controls will impact ozone, an understanding of the sources and sinks of OH and the chemical cycling between peroxy radicals is needed. This paper presents measurements of OH, HO2 and total RO2 taken in central Beijing. The radical observations are compared to a detailed chemistry model, which shows that under low NO conditions, there is a missing OH source. Under high NOx conditions, the model under-predicts RO2 and impacts our ability to model ozone.
Huan Song, Xiaorui Chen, Keding Lu, Qi Zou, Zhaofeng Tan, Hendrik Fuchs, Alfred Wiedensohler, Daniel R. Moon, Dwayne E. Heard, María-Teresa Baeza-Romero, Mei Zheng, Andreas Wahner, Astrid Kiendler-Scharr, and Yuanhang Zhang
Atmos. Chem. Phys., 20, 15835–15850, https://doi.org/10.5194/acp-20-15835-2020, https://doi.org/10.5194/acp-20-15835-2020, 2020
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Accurate calculation of the HO2 uptake coefficient is one of the key parameters to quantify the co-reduction of both aerosol and ozone pollution. We modelled various lab measurements of γHO2 based on a gas-liquid phase kinetic model and developed a state-of-the-art parameterized equation. Based on a dataset from a comprehensive field campaign in the North China Plain, we proposed that the determination of the heterogeneous uptake process for HO2 should be included in future field campaigns.
Eloise J. Slater, Lisa K. Whalley, Robert Woodward-Massey, Chunxiang Ye, James D. Lee, Freya Squires, James R. Hopkins, Rachel E. Dunmore, Marvin Shaw, Jacqueline F. Hamilton, Alastair C. Lewis, Leigh R. Crilley, Louisa Kramer, William Bloss, Tuan Vu, Yele Sun, Weiqi Xu, Siyao Yue, Lujie Ren, W. Joe F. Acton, C. Nicholas Hewitt, Xinming Wang, Pingqing Fu, and Dwayne E. Heard
Atmos. Chem. Phys., 20, 14847–14871, https://doi.org/10.5194/acp-20-14847-2020, https://doi.org/10.5194/acp-20-14847-2020, 2020
Short summary
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The paper details atmospheric chemistry in a megacity (Beijing), focussing on radicals which mediate the formation of secondary pollutants such as ozone and particles. Highly polluted conditions were experienced, including the highest ever levels of nitric oxide (NO), with simultaneous radical measurements. Radical concentrations were large during "haze" events, demonstrating active photochemistry. Modelling showed that our understanding of the chemistry at high NOx levels is incomplete.
Michael Rolletter, Marion Blocquet, Martin Kaminski, Birger Bohn, Hans-Peter Dorn, Andreas Hofzumahaus, Frank Holland, Xin Li, Franz Rohrer, Ralf Tillmann, Robert Wegener, Astrid Kiendler-Scharr, Andreas Wahner, and Hendrik Fuchs
Atmos. Chem. Phys., 20, 13701–13719, https://doi.org/10.5194/acp-20-13701-2020, https://doi.org/10.5194/acp-20-13701-2020, 2020
Short summary
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The photooxidation of pinonaldehyde is investigated in a chamber study under natural sunlight and low NO conditions with and without an added hydroxyl radical (OH) scavenger. The experimentally determined pinonaldehyde photolysis frequency is faster by a factor of 3.5 than currently used parameterizations in atmospheric models. Yields of degradation products are measured in the presence and absence of OH. Measurements are compared to current atmospheric models and a theory-based mechanism.
Mohammed S. Alam, Leigh R. Crilley, James D. Lee, Louisa J. Kramer, Christian Pfrang, Mónica Vázquez-Moreno, Milagros Ródenas, Amalia Muñoz, and William J. Bloss
Atmos. Meas. Tech., 13, 5977–5991, https://doi.org/10.5194/amt-13-5977-2020, https://doi.org/10.5194/amt-13-5977-2020, 2020
Short summary
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We report on the interference arising in measurements of nitrogen oxides (NOx) from the presence of a range of alkenes in sampled air when using the most widespread air quality monitoring technique for chemiluminescence detection. Interferences of up to 11 % are reported, depending upon the alkene present and conditions used. Such interferences may be of substantial importance for the interpretation of ambient NOx data, particularly for high volatile organic compound and low NOx environments.
Bettina Hottmann, Sascha Hafermann, Laura Tomsche, Daniel Marno, Monica Martinez, Hartwig Harder, Andrea Pozzer, Marco Neumaier, Andreas Zahn, Birger Bohn, Greta Stratmann, Helmut Ziereis, Jos Lelieveld, and Horst Fischer
Atmos. Chem. Phys., 20, 12655–12673, https://doi.org/10.5194/acp-20-12655-2020, https://doi.org/10.5194/acp-20-12655-2020, 2020
Short summary
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During OMO we observed enhanced mixing ratios of hydroperoxides (ROOH) in the Asian monsoon anticyclone (AMA) relative to the background. The observed mixing ratios are higher than steady-state calculations and EMAC simulations, especially in the AMA, indicating atmospheric transport of ROOH. Uncertainties in the scavenging efficiencies likely cause deviations from EMAC. Longitudinal gradients indicate a pool of ROOH towards the center of the AMA associated with upwind convection over India.
Ruqian Miao, Qi Chen, Yan Zheng, Xi Cheng, Yele Sun, Paul I. Palmer, Manish Shrivastava, Jianping Guo, Qiang Zhang, Yuhan Liu, Zhaofeng Tan, Xuefei Ma, Shiyi Chen, Limin Zeng, Keding Lu, and Yuanhang Zhang
Atmos. Chem. Phys., 20, 12265–12284, https://doi.org/10.5194/acp-20-12265-2020, https://doi.org/10.5194/acp-20-12265-2020, 2020
Short summary
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In this study we evaluated the model performances for simulating secondary inorganic aerosol (SIA) and organic aerosol (OA) in PM2.5 in China against comprehensive datasets. The potential biases from factors related to meteorology, emission, chemistry, and atmospheric removal are systematically investigated. This study provides a comprehensive understanding of modeling PM2.5, which is important for studies on the effectiveness of emission control strategies.
Patrick Dewald, Jonathan M. Liebmann, Nils Friedrich, Justin Shenolikar, Jan Schuladen, Franz Rohrer, David Reimer, Ralf Tillmann, Anna Novelli, Changmin Cho, Kangming Xu, Rupert Holzinger, François Bernard, Li Zhou, Wahid Mellouki, Steven S. Brown, Hendrik Fuchs, Jos Lelieveld, and John N. Crowley
Atmos. Chem. Phys., 20, 10459–10475, https://doi.org/10.5194/acp-20-10459-2020, https://doi.org/10.5194/acp-20-10459-2020, 2020
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We present direct measurements of NO3 reactivity resulting from the oxidation of isoprene by NO3 during an intensive simulation chamber study. Measurements were in excellent agreement with values calculated from measured isoprene amounts and the rate coefficient for the reaction of NO3 with isoprene. Comparison of the measurement with NO3 reactivities from non-steady-state and model calculations suggests that isoprene-derived RO2 and HO2 radicals account to ~ 50 % of overall NO3 losses.
Iida Pullinen, Sebastian Schmitt, Sungah Kang, Mehrnaz Sarrafzadeh, Patrick Schlag, Stefanie Andres, Einhard Kleist, Thomas F. Mentel, Franz Rohrer, Monika Springer, Ralf Tillmann, Jürgen Wildt, Cheng Wu, Defeng Zhao, Andreas Wahner, and Astrid Kiendler-Scharr
Atmos. Chem. Phys., 20, 10125–10147, https://doi.org/10.5194/acp-20-10125-2020, https://doi.org/10.5194/acp-20-10125-2020, 2020
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Biogenic and anthropogenic air masses mix in the atmosphere, bringing plant-emitted monoterpenes and traffic-related nitrogen oxides together. There is debate whether the presence of nitrogen oxides reduces or increases secondary aerosol formation. This is important as secondary aerosols have cooling effects in the climate system but also constitute a health risk in populated areas. We show that the presence of NOx alone should not much affect the mass yields of secondary organic aerosols.
Cited articles
Atkinson, R., Baulch, D. L., Cox, R. A., Crowley, J. N., Hampson, R. F.,
Hynes, R. G., Jenkin, M. E., Rossi, M. J., and Troe, J.: Evaluated kinetic
and photochemical data for atmospheric chemistry: Volume I – gas phase
reactions of Ox, HOx, NOx and SOx species, Atmos. Chem.
Phys., 4, 1461–1738, https://doi.org/10.5194/acp-4-1461-2004, 2004.
Atkinson, R., Baulch, D. L., Cox, R. A., Crowley, J. N., Hampson, R. F.,
Hynes, R. G., Jenkin, M. E., Rossi, M. J., Troe, J., and Subcommittee, I.:
Evaluated kinetic and photochemical data for atmospheric chemistry: Volume
II – gas phase reactions of organic species, Atmos. Chem. Phys., 6,
3625–4055, https://doi.org/10.5194/acp-6-3625-2006, 2006.
Bloss, W. J., Lee, J. D., Johnson, G. P., Sommariva, R., Heard, D. E.,
Saiz-Lopez, A., Plane, J. M. C., McFiggans, G., Coe, H., Flynn, M.,
Williams, P., Rickard, A. R., and Fleming, Z. L.: Impact of halogen monoxide
chemistry upon boundary layer OH and HO2 concentrations at a coastal
site, Geophys. Res. Lett., 32, 1–4, https://doi.org/10.1029/2004GL022084, 2005.
BMEL (Federal Ministry of Food and Agriculture): Ergebnisse der
Waldzustandserhebung 2020, Bonn, Germany, https://www.bmel.de/ (last access: January 2023), 2021.
Bohn, B., Rohrer, F., Brauers, T., and Wahner, A.: Actinometric measurements
of NO2 photolysis frequencies in the atmosphere simulation chamber
SAPHIR, Atmos. Chem. Phys., 5, 493–503, https://doi.org/10.5194/acp-5-493-2005, 2005.
Bohn, B. and Zilken, H.: Model-aided radiometric determination of
photolysis frequencies in a sunlit atmosphere simulation chamber, Atmos.
Chem. Phys., 5, 191–206, https://doi.org/10.5194/acp-5-191-2005, 2005.
Brune, W. H., Baier, B. C., Thomas, J., Ren, X., Cohen, R. C., Pusede, S.
E., Browne, E. C., Goldstein, A. H., Gentner, D. R., Keutsch, F. N.,
Thornton, J. A., Harrold, S., Lopez-Hilfiker, F. D., and Wennberg, P. O.:
Ozone production chemistry in the presence of urban plumes, Faraday
Discuss., 189, 169–189, https://doi.org/10.1039/C5FD00204D, 2016.
Burkholder, J. B., Sander, S. P., Abbatt, J., Barker, J. R., Cappa, C., Crounse, J. D., Dibble, T. S., Huie, R. E., Kolb, C. E., Kurylo, M. J., Orkin, V. L., Percival, C. J., Wilmouth, D. M., and Wine, P. H.: Chemical Kinetics and Photochemical Data for Use in Atmospheric Studies, Evaluation No. 19, JPL Publication 19-5, Jet Propulsion Laboratory, Pasadena, https://jpldataeval.jpl.nasa.gov/ (last access: January 2023), 2019.
Cazorla, M., Brune, W. H., Ren, X., and Lefer, B.: Direct measurement of
ozone production rates in Houston in 2009 and comparison with two estimation
methods, Atmos. Chem. Phys., 12, 1203–1212, https://doi.org/10.5194/acp-12-1203-2012,
2012.
Chen, S., Ren, X., Mao, J., Chen, Z., Brune, W. H., Lefer, B.,
Rappenglück, B., Flynn, J., Olson, J., and Crawford, J. H.: A comparison
of chemical mechanisms based on TRAMP-2006 field data, Atmos. Environ., 44,
4116–4125, https://doi.org/10.1016/j.atmosenv.2009.05.027, 2010.
Cho, C., Hofzumahaus, A., Fuchs, H., Dorn, H. P., Glowania, M., Holland, F.,
Rohrer, F., Vardhan, V., Kiendler-Scharr, A., Wahner, A., and Novelli, A.:
Characterization of a chemical modulation reactor (CMR) for the measurement
of atmospheric concentrations of hydroxyl radicals with a laser-induced
fluorescence instrument, Atmos. Meas. Tech., 14, 1851–1877,
https://doi.org/10.5194/amt-14-1851-2021, 2021.
Cox, R. A., Ammann, M., Crowley, J. N., Herrmann, H., Jenkin, M. E.,
McNeill, V. F., Mellouki, A., Troe, J., and Wallington, T. J.: Evaluated
kinetic and photochemical data for atmospheric chemistry: Volume VII –
Criegee intermediates, Atmos. Chem. Phys., 20, 13497–13519,
https://doi.org/10.5194/acp-20-13497-2020, 2020.
Crounse, J. D., Paulot, F., Kjaergaard, H. G., and Wennberg, P. O.: Peroxy
radical isomerization in the oxidation of isoprene, Phys. Chem. Chem. Phys.,
13, 13607–13613, https://doi.org/10.1039/C1CP21330J, 2011.
Crounse, J. D., Knap, H. C., Ørnsø, K. B., Jørgensen, S., Paulot,
F., Kjaergaard, H. G., and Wennberg, P. O.: Atmospheric Fate of
Methacrolein, 1. Peroxy Radical Isomerization Following Addition of OH and
O2, J. Phys. Chem. A, 116, 5756–5762, https://doi.org/10.1021/jp211560u, 2012.
da Silva, G., Graham, C., and Wang, Z.-F.: Unimolecular â-hydroxyperoxy
radical decomposition with OH recycling in the photochemical oxidation of
isoprene, Environ. Sci. Technol., 44, 250–256, https://doi.org/10.1021/es900924d, 2010.
Dillon, T. J. and Crowley, J. N.: Direct detection of OH formation in the
reactions of HO2 with CH3C(O)O2 and other substituted peroxy
radicals, Atmos. Chem. Phys., 8, 4877–4889, https://doi.org/10.5194/acp-8-4877-2008,
2008.
Dusanter, S., Vimal, D., Stevens, P. S., Volkamer, R., Molina, L. T., Baker,
A., Meinardi, S., Blake, D., Sheehy, P., Merten, A., Zhang, R., Zheng, J.,
Fortner, E. C., Junkermann, W., Dubey, M., Rahn, T., Eichinger, B.,
Lewandowski, P., Prueger, J., and Holder, H.: Measurements of OH and
HO2 concentrations during the MCMA-2006 field campaign – Part 2: Model
comparison and radical budget, Atmos. Chem. Phys., 9, 6655–6675,
https://doi.org/10.5194/acp-9-6655-2009, 2009.
Ehhalt, D. H. and Rohrer, F.: Dependence of the OH concentration on solar
UV, J. Geophys. Res.-Atmos., 105, 3565–3571, https://doi.org/10.1029/1999jd901070,
2000.
Elshorbany, Y. F., Kleffmann, J., Hofzumahaus, A., Kurtenbach, R., Wiesen,
P., Brauers, T., Bohn, B., Dorn, H.-P., Fuchs, H., Holland, F., Rohrer, F.,
Tillmann, R., Wegener, R., Wahner, A., Kanaya, Y., Yoshino, A., Nishida, S.,
Kajii, Y., Martinez, M., Kubistin, D., Harder, H., Lelieveld, J., Elste, T.,
Plass-Dülmer, C., Stange, G., Berresheim, H., and Schurath, U.: HOx
budgets during HOxComp: A case study of HOx chemistry under NOx-limited
conditions, J. Geophys. Res.-Atmos., 117, D03307, https://doi.org/10.1029/2011JD017008, 2012.
Fan, S. and Li, Y.: The impacts of marine-emitted halogens on OH radicals
in East Asia during summer, Atmos. Chem. Phys., 22, 7331–7351,
https://doi.org/10.5194/acp-22-7331-2022, 2022.
Fishman, J. and Carney, T. A.: A one-dimensional photochemical model of the
troposphere with planetary boundary-layer parameterization, J. Atmos. Chem.,
1, 351–376, https://doi.org/10.1007/BF00053800, 1984.
Fuchs, H., Holland, F., and Hofzumahaus, A.: Measurement of tropospheric
RO2 and HO2 radicals by a laser-induced fluorescence instrument,
Rev. Sci. Instrum., 79, 084104, https://doi.org/10.1063/1.2968712, 2008.
Fuchs, H., Bohn, B., Hofzumahaus, A., Holland, F., Lu, K. D., Nehr, S.,
Rohrer, F., and Wahner, A.: Detection of HO2 by laser-induced
fluorescence: calibration and interferences from RO2 radicals, Atmos.
Meas. Tech., 4, 1209–1225, https://doi.org/10.5194/amt-4-1209-2011, 2011.
Fuchs, H., Dorn, H. P., Bachner, M., Bohn, B., Brauers, T., Gomm, S.,
Hofzumahaus, A., Holland, F., Nehr, S., Rohrer, F., Tillmann, R., and
Wahner, A.: Comparison of OH concentration measurements by DOAS and LIF
during SAPHIR chamber experiments at high OH reactivity and low NO
concentration, Atmos. Meas. Tech., 5, 1611–1626,
https://doi.org/10.5194/amt-5-1611-2012, 2012.
Fuchs, H., Hofzumahaus, A., Rohrer, F., Bohn, B., Brauers, T., Dorn, H. P.,
Häseler, R., Holland, F., Kaminski, M., Li, X., Lu, K., Nehr, S.,
Tillmann, R., Wegener, R., and Wahner, A.: Experimental evidence for
efficient hydroxyl radical regeneration in isoprene oxidation, Nat. Geosci.,
6, 1023–1026, https://doi.org/10.1038/ngeo1964, 2013.
Fuchs, H., Acir, I. H., Bohn, B., Brauers, T., Dorn, H. P., Häseler, R.,
Hofzumahaus, A., Holland, F., Kaminski, M., Li, X., Lu, K., Lutz, A., Nehr,
S., Rohrer, F., Tillmann, R., Wegener, R., and Wahner, A.: OH regeneration
from methacrolein oxidation investigated in the atmosphere simulation
chamber SAPHIR, Atmos. Chem. Phys., 14, 7895–7908,
https://doi.org/10.5194/acp-14-7895-2014, 2014.
Fuchs, H., Novelli, A., Rolletter, M., Hofzumahaus, A., Pfannerstill, E. Y.,
Kessel, S., Edtbauer, A., Williams, J., Michoud, V., Dusanter, S., Locoge,
N., Zannoni, N., Gros, V., Truong, F., Sarda-Esteve, R., Cryer, D. R.,
Brumby, C. A., Whalley, L. K., Stone, D., Seakins, P. W., Heard, D. E.,
Schoemaecker, C., Blocquet, M., Coudert, S., Batut, S., Fittschen, C.,
Thames, A. B., Brune, W. H., Ernest, C., Harder, H., Muller, J. B. A.,
Elste, T., Kubistin, D., Andres, S., Bohn, B., Hohaus, T., Holland, F., Li,
X., Rohrer, F., Kiendler-Scharr, A., Tillmann, R., Wegener, R., Yu, Z., Zou,
Q., and Wahner, A.: Comparison of OH reactivity measurements in the
atmospheric simulation chamber SAPHIR, Atmos. Meas. Tech., 10, 4023–4053,
https://doi.org/10.5194/amt-10-4023-2017, 2017.
Fuchs, H., Albrecht, S., Acir, I., Bohn, B., Breitenlechner, M., Dorn, H.
P., Gkatzelis, G. I., Hofzumahaus, A., Holland, F., Kaminski, M., Keutsch,
F. N., Novelli, A., Reimer, D., Rohrer, F., Tillmann, R., Vereecken, L.,
Wegener, R., Zaytsev, A., Kiendler-Scharr, A., and Wahner, A.: Investigation
of the oxidation of methyl vinyl ketone (MVK) by OH radicals in the
atmospheric simulation chamber SAPHIR, Atmos. Chem. Phys., 18, 8001–8016,
https://doi.org/10.5194/acp-18-8001-2018, 2018.
George, I. J., Vlasenko, A., Slowik, J. G., Broekhuizen, K., and Abbatt, J.
P. D.: Heterogeneous oxidation of saturated organic aerosols by hydroxyl
radicals: uptake kinetics, condensed-phase products, and particle size
change, Atmos. Chem. Phys., 7, 4187–4201, https://doi.org/10.5194/acp-7-4187-2007, 2007.
George, I. J., Matthews, P. S. J., Whalley, L. K., Brooks, B., Goddard, A.,
Baeza-Romero, M. T., and Heard, D. E.: Measurements of uptake coefficients
for heterogeneous loss of HO2 onto submicron inorganic salt aerosols,
Phys. Chem. Chem. Phys, 15, 12829–12845, https://doi.org/10.1039/C3CP51831K, 2013.
Glowania, M., Rohrer, F., Dorn, H.-P., Hofzumahaus, A., Holland, F., Kiendler-Scharr, A., Wahner, A., and Fuchs, H.: Comparison of formaldehyde measurements by Hantzsch, CRDS and DOAS in the SAPHIR chamber, Atmos. Meas. Tech., 14, 4239–4253, https://doi.org/10.5194/amt-14-4239-2021, 2021.
Goldberg, D. L., Vinciguerra, T. P., Hosley, K. M., Loughner, C. P., Canty,
T. P., Salawitch, R. J., and Dickerson, R. R.: Evidence for an increase in
the ozone photochemical lifetime in the eastern United States using a
regional air quality model, J. Geophys. Res.-Atmos., 120, 12778–12793,
https://doi.org/10.1002/2015JD023930, 2015.
Goldstein, A. H. and Galbally, I. E.: Known and Unexplored Organic
Constituents in the Earth's Atmosphere, Environ. Sci. Technol., 41,
1514–1521, https://doi.org/10.1021/es072476p, 2007.
Goldstein, A. H., Fan, S. M., Goulden, M. L., Munger, J. W., and Wofsy, S.
C.: Emissions of ethene, propene, and 1-butene by a midlatitude forest,
J. Geophys. Res.-Atmos., 101, 9149–9157,
https://doi.org/10.1029/96JD00334, 1996.
Griffith, S. M., Hansen, R. F., Dusanter, S., Stevens, P. S., Alaghmand, M.,
Bertman, S. B., Carroll, M. A., Erickson, M., Galloway, M., Grossberg, N.,
Hottle, J., Hou, J., Jobson, B. T., Kammrath, A., Keutsch, F. N., Lefer, B.
L., Mielke, L. H., O'Brien, A., Shepson, P. B., Thurlow, M., Wallace, W.,
Zhang, N., and Zhou, X. L.: OH and HO2 radical chemistry during PROPHET
2008 and CABINEX 2009 – Part 1: Measurements and model comparison, Atmos.
Chem. Phys., 13, 5403–5423, https://doi.org/10.5194/acp-13-5403-2013, 2013.
Griffith, S. M., Hansen, R. F., Dusanter, S., Michoud, V., Gilman, J. B.,
Kuster, W. C., Veres, P. R., Graus, M., de Gouw, J. A., Roberts, J., Young,
C., Washenfelder, R., Brown, S. S., Thalman, R., Waxman, E., Volkamer, R.,
Tsai, C., Stutz, J., Flynn, J. H., Grossberg, N., Lefer, B., Alvarez, S. L.,
Rappenglueck, B., Mielke, L. H., Osthoff, H. D., and Stevens, P. S.:
Measurements of hydroxyl and hydroperoxy radicals during CalNex-LA: Model
comparisons and radical budgets, J. Geophys. Res.-Atmos., 121, 4211–4232,
https://doi.org/10.1002/2015jd024358, 2016.
Groß, C. B. M., Dillon, T. J., Schuster, G., Lelieveld, J., and Crowley,
J. N.: Direct Kinetic Study of OH and O3 Formation in the Reaction of
CH3C(O)O2 with HO2, J. Phys. Chem. A, 118, 974–985,
https://doi.org/10.1021/jp412380z, 2014.
Han, S., Bian, H., Feng, Y., Liu, A., Li, X., Zeng, F., and Zhang, X.:
Analysis of the Relationship between O3, NO and NO2 in Tianjin,
China, Aerosol Air Qual. Res., 11, 128–139, https://doi.org/10.4209/aaqr.2010.07.0055,
2011.
Handisides, G. M., Plass-Dülmer, C., Gilge, S., Bingemer, H., and
Berresheim, H.: Hohenpeissenberg Photochemical Experiment (HOPE 2000):
Measurements and photostationary state calculations of OH and peroxy
radicals, Atmos. Chem. Phys., 3, 1565–1588, https://doi.org/10.5194/acp-3-1565-2003,
2003.
Häseler, R., Brauers, T., Holland, F., and Wahner, A.: Development and application of a new mobile LOPAP instrument for the measurement of HONO altitude profiles in the planetary boundary layer, Atmos. Meas. Tech. Discuss., 2, 2027–2054, https://doi.org/10.5194/amtd-2-2027-2009, 2009.
Hasson, A. S., Tyndall, G. S., and Orlando, J. J.: A Product Yield Study of
the Reaction of HO2 Radicals with Ethyl Peroxy (C2H5O2),
Acetyl Peroxy (CH3C(O)O2), and Acetonyl Peroxy
(CH3C(O)CH2O2) Radicals, J. Phys. Chem. A, 108, 5979–5989,
https://doi.org/10.1021/jp048873t, 2004.
Hausmann, M., Brandenburger, U., Brauers, T., and Dorn, H.-P.: Detection of tropospheric OH radicals by long-path differential optical-absorption spectroscopy: Experimental setup, accuracy, and precision, J. Geophys. Res., 102, 16011–16022, https://doi.org/10.1029/97jd00931, 1997.
Heard, D. E., Carpenter, L. J., Creasey, D. J., Hopkins, J. R., Lee, J. D., Lewis, A. C., Pilling, M. J., Seakins, P. W., Carslaw, N., and Emmerson, K. M.: High levels of the hydroxyl radical in the winter urban troposphere, Geophys. Res. Lett., 31, L18112, https://doi.org/10.1029/2004GL020544, 2004.
Hens, K., Novelli, A., Martinez, M., Auld, J., Axinte, R., Bohn, B.,
Fischer, H., Keronen, P., Kubistin, D., Nölscher, A. C., Oswald, R.,
Paasonen, P., Petäjä, T., Regelin, E., Sander, R., Sinha, V.,
Sipilä, M., Taraborrelli, D., Tatum Ernest, C., Williams, J., Lelieveld,
J., and Harder, H.: Observation and modelling of HOx radicals in a boreal
forest, Atmos. Chem. Phys., 14, 8723–8747, https://doi.org/10.5194/acp-14-8723-2014,
2014.
Hofzumahaus, A., Rohrer, F., Lu, K., Bohn, B., Brauers, T., Chang, C.-C.,
Fuchs, H., Holland, F., Kita, K., Kondo, Y., Li, X., Lou, S., Shao, M.,
Zeng, L., Wahner, A., and Zhang, Y.: Amplified trace gas removal in the
troposphere, Science, 324, 1702–1704, https://doi.org/10.1126/science.1164566, 2009.
Hofzumahaus, A. and Heard, D. H.: Assessment of local HOx and ROx
measurement techniques: achivements, challenges, and future directions –
Outcomes of the 2015 international HOx workshop, Forschungszentrum
Jülich, Jülich, 20–21, https://juser.fz-juelich.de/record/826803 (last access: January 2023), 2016.
Holland, F., Hofzumahaus, A., Schäfer, J., Kraus, A., and Pätz,
H.-W.: Measurements of OH and HO2 radical concentrations and photolysis
frequencies during BERLIOZ, J. Geophys. Res.-Atmos., 108, 8246,
https://doi.org/10.1029/2001jd001393, 2003.
Jenkin, M. E., Valorso, R., Aumont, B., and Rickard, A. R.: Estimation of
rate coefficients and branching ratios for reactions of organic peroxy
radicals for use in automated mechanism construction, Atmos. Chem. Phys.,
19, 7691–7717, https://doi.org/10.5194/acp-19-7691-2019, 2019.
Jordan, A., Haidacher, S., Hanel, G., Hartungen, E., Märk, L.,
Seehauser, H., Schottkowsky, R., Sulzer, P., and Märk, T. D.: A high
resolution and high sensitivity proton-transfer-reaction time-of-flight mass
spectrometer (PTR-TOF-MS), Int. J. Mass Spectrom., 286, 122–128,
https://doi.org/10.1016/j.ijms.2009.07.005, 2009.
Kaminski, M., Fuchs, H., Acir, I. H., Bohn, B., Brauers, T., Dorn, H. P.,
Häseler, R., Hofzumahaus, A., Li, X., Lutz, A., Nehr, S., Rohrer, F.,
Tillmann, R., Vereecken, L., Wegener, R., and Wahner, A.: Investigation of
the â-pinene photooxidation by OH in the atmosphere simulation chamber
SAPHIR, Atmos. Chem. Phys., 17, 6631–6650, https://doi.org/10.5194/acp-17-6631-2017,
2017.
Kanaya, Y., Cao, R., Akimoto, H., Fukuda, M., Komazaki, Y., Yokouchi, Y.,
Koike, M., Tanimoto, H., Takegawa, N., and Kondo, Y.: Urban photochemistry
in central Tokyo: 1. Observed and modeled OH and HO2 radical
concentrations during the winter and summer of 2004, J. Geophys. Res.-Atmos., 112, D21312, https://doi.org/10.1029/2007jd008670, 2007.
Kanaya, Y., Hofzumahaus, A., Dorn, H. P., Brauers, T., Fuchs, H., Holland,
F., Rohrer, F., Bohn, B., Tillmann, R., Wegener, R., Wahner, A., Kajii, Y.,
Miyamoto, K., Nishida, S., Watanabe, K., Yoshino, A., Kubistin, D.,
Martinez, M., Rudolf, M., Harder, H., Berresheim, H., Elste, T.,
Plass-Dülmer, C., Stange, G., Kleffmann, J., Elshorbany, Y., and
Schurath, U.: Comparisons of observed and modeled OH and HO2
concentrations during the ambient measurement period of the HOxComp
field campaign, Atmos. Chem. Phys., 12, 2567–2585,
https://doi.org/10.5194/acp-12-2567-2012, 2012.
Kim, S., Wolfe, G. M., Mauldin, L., Cantrell, C., Guenther, A., Karl, T.,
Turnipseed, A., Greenberg, J., Hall, S. R., Ullmann, K., Apel, E.,
Hornbrook, R., Kajii, Y., Nakashima, Y., Keutsch, F. N., DiGangi, J. P.,
Henry, S. B., Kaser, L., Schnitzhofer, R., Graus, M., Hansel, A., Zheng, W.,
and Flocke, F. F.: Evaluation of HOx sources and cycling using
measurement-constrained model calculations in a 2-methyl-3-butene-2-ol (MBO)
and monoterpene (MT) dominated ecosystem, Atmos. Chem. Phys., 13, 2031–2044,
https://doi.org/10.5194/acp-13-2031-2013, 2013.
Kleffmann, J., Lörzer, J. C., Wiesen, P., Kern, C., Trick, S., Volkamer,
R., Rodenas, M., and Wirtz, K.: Intercomparison of the DOAS and LOPAP
techniques for the detection of nitrous acid (HONO), Atmos. Environ., 40,
3640–3652, https://doi.org/10.1016/j.atmosenv.2006.03.027, 2006.
Kleinman, L. I., Daum, P. H., Lee, Y.-N., Nunnermacker, L. J., Springston,
S. R., Weinstein-Lloyd, J., and Rudolph, J.: Ozone production efficiency in
an urban area, J. Geophys. Res.-Atmos., 107, 4733,
https://doi.org/10.1029/2002JD002529, 2002.
Komenda, M., Schaub, A., and Koppmann, R.: Description and characterization
of an on-line system for long-term measurements of isoprene, methyl vinyl
ketone, and methacrolein in ambient air, J. Chromatogr. A, 995, 185–201,
https://doi.org/10.1016/S0021-9673(03)00518-1, 2003.
Konrad, S., Schmitz, T., Buers, H.-J., Houben, N., Mannschreck, K.,
Mihelcic, D., Müsgen, P., Pätz, H.-W., Holland, F., Hofzumahaus, A.,
Schäfer, H.-J., Schröder, S., Volz-Thomas, A., Bächmann, K.,
Schlomski, S., Moortgat, G., and Großmann, D.: Hydrocarbon measurements
at Pabstthum during the BERLIOZ campaign and modeling of free radicals, J.
Geophys. Res.-Atmos., 108, 8251, https://doi.org/10.1029/2001JD000866, 2003.
Kubistin, D., Harder, H., Martinez, M., Rudolf, M., Sander, R., Bozem, H.,
Eerdekens, G., Fischer, H., Gurk, C., Klüpfel, T., Königstedt, R.,
Parchatka, U., Schiller, C. L., Stickler, A., Taraborrelli, D., Williams,
J., and Lelieveld, J.: Hydroxyl radicals in the tropical troposphere over
the Suriname rainforest: comparison of measurements with the box model
MECCA, Atmos. Chem. Phys., 10, 9705–9728, https://doi.org/10.5194/acp-10-9705-2010,
2010.
Lakey, P. S. J., George, I. J., Whalley, L. K., Baeza-Romero, M. T., and
Heard, D. E.: Measurements of the HO2 Uptake Coefficients onto Single
Component Organic Aerosols, Environ. Sci. Technol., 49, 4878–4885,
https://doi.org/10.1021/acs.est.5b00948, 2015.
Lelieveld, J., Butler, T. M., Crowley, J. N., Dillon, T. J., Fischer, H.,
Ganzeveld, L., Harder, H., Lawrence, M. G., Martinez, M., Taraborrelli, D.,
and Williams, J.: Atmospheric oxidation capacity sustained by a tropical
forest, Nature, 452, 737–740, https://doi.org/10.1038/nature06870, 2008.
Lou, S., Holland, F., Rohrer, F., Lu, K., Bohn, B., Brauers, T., Chang, C.
C., Fuchs, H., Häseler, R., Kita, K., Kondo, Y., Li, X., Shao, M., Zeng,
L., Wahner, A., Zhang, Y., Wang, W., and Hofzumahaus, A.: Atmospheric OH
reactivities in the Pearl River Delta – China in summer 2006: measurement
and model results, Atmos. Chem. Phys., 10, 11243–11260,
https://doi.org/10.5194/acp-10-11243-2010, 2010.
Lu, K. D., Hofzumahaus, A., Holland, F., Bohn, B., Brauers, T., Fuchs, H.,
Hu, M., Häseler, R., Kita, K., Kondo, Y., Li, X., Lou, S. R., Oebel, A.,
Shao, M., Zeng, L. M., Wahner, A., Zhu, T., Zhang, Y. H., and Rohrer, F.:
Missing OH source in a suburban environment near Beijing: observed and
modelled OH and HO2 concentrations in summer 2006, Atmos. Chem. Phys.,
13, 1057–1080, https://doi.org/10.5194/acp-13-1057-2013, 2013.
Lu, K. D., Rohrer, F., Holland, F., Fuchs, H., Brauers, T., Oebel, A.,
Dlugi, R., Hu, M., Li, X., Lou, S. R., Shao, M., Zhu, T., Wahner, A., Zhang,
Y. H., and Hofzumahaus, A.: Nighttime observation and chemistry of HOX
in the Pearl River Delta and Beijing in summer 2006, Atmos. Chem. Phys., 14,
4979–4999, https://doi.org/10.5194/acp-14-4979-2014, 2014.
Ma, X., Tan, Z., Lu, K., Yang, X., Liu, Y., Li, S., Li, X., Chen, S.,
Novelli, A., Cho, C., Zeng, L., Wahner, A., and Zhang, Y.: Winter
photochemistry in Beijing: Observation and model simulation of OH and
HO2 radicals at an urban site, Sci. Tot. Environ., 685, 85–95,
https://doi.org/10.1016/j.scitotenv.2019.05.329, 2019.
Malkin, T. L., Goddard, A., Heard, D. E., and Seakins, P. W.: Measurements
of OH and HO2 yields from the gas phase ozonolysis of isoprene, Atmos.
Chem. Phys., 10, 1441–1459, https://doi.org/10.5194/acp-10-1441-2010, 2010.
Mao, J., Ren, X., Chen, S., Brune, W. H., Chen, Z., Martinez, M., Harder,
H., Lefer, B., Rappenglück, B., Flynn, J., and Leuchner, M.: Atmospheric
oxidation capacity in the summer of Houston 2006: Comparison with summer
measurements in other metropolitan studies, Atmos. Environ., 44, 4107–4115,
https://doi.org/10.1016/j.atmosenv.2009.01.013, 2010.
Mao, J., Ren, X., Zhang, L., Van Duin, D. M., Cohen, R. C., Park, J. H.,
Goldstein, A. H., Paulot, F., Beaver, M. R., Crounse, J. D., Wennberg, P.
O., DiGangi, J. P., Henry, S. B., Keutsch, F. N., Park, C., Schade, G. W.,
Wolfe, G. M., Thornton, J. A., and Brune, W. H.: Insights into hydroxyl
measurements and atmospheric oxidation in a California forest, Atmos. Chem.
Phys., 12, 8009–8020, https://doi.org/10.5194/acp-12-8009-2012, 2012.
Martinez, M., Harder, H., Kovacs, T. A., Simpas, J. B., Bassis, J., Lesher,
R., Brune, W. H., Frost, G. J., Williams, E. J., Stroud, C. A., Jobson, B.
T., Roberts, J. M., Hall, S. R., Shetter, R. E., Wert, B., Fried, A.,
Alicke, B., Stutz, J., Young, V. L., White, A. B., and Zamora, R. J.: OH and
HO2 concentrations, sources, and loss rates during the Southern
Oxidants Study in Nashville, Tennessee, summer 1999, J. Geophys. Res.-Atmos., 108, 4617, https://doi.org/10.1029/2003JD003551, 2003.
Mihelcic, D., Holland, F., Hofzumahaus, A., Hoppe, L., Konrad, S.,
Müsgen, P., Pätz, H.-W., Schäfer, H.-J., Schmitz, T.,
Volz-Thomas, A., Bächmann, K., Schlomski, S., Platt, U., Geyer, A.,
Alicke, B., and Moortgat, G. K.: Peroxy radicals during BERLIOZ at
Pabstthum: Measurements, radical budgets and ozone production, J. Geophys.
Res.-Atmos., 108, D4, https://doi.org/10.1029/2001JD001014, 2003.
Nehr, S., Bohn, B., Fuchs, H., Hofzumahaus, A., and Wahner, A.: HO2
formation from the OH+ benzene reaction in the presence of O2,
Phys. Chem. Chem. Phys., 13, 10699–10708,
https://doi.org/10.1039/C1CP20334G, 2011.
Nehr, S., Bohn, B., Dorn, H. P., Fuchs, H., Häseler, R., Hofzumahaus,
A., Li, X., Rohrer, F., Tillmann, R., and Wahner, A.: Atmospheric
photochemistry of aromatic hydrocarbons: OH budgets during SAPHIR chamber
experiments, Atmos. Chem. Phys., 14, 6941–6952,
https://doi.org/10.5194/acp-14-6941-2014, 2014.
Novelli, A., Hens, K., Tatum Ernest, C., Kubistin, D., Regelin, E., Elste,
T., Plass-Dülmer, C., Martinez, M., Lelieveld, J., and Harder, H.:
Characterisation of an inlet pre-injector laser-induced fluorescence
instrument for the measurement of atmospheric hydroxyl radicals, Atmos.
Meas. Tech., 7, 3413–3430, https://doi.org/10.5194/amt-7-3413-2014, 2014.
Novelli, A., Kaminski, M., Rolletter, M., Acir, I. H., Bohn, B., Dorn, H.
P., Li, X., Lutz, A., Nehr, S., Rohrer, F., Tillmann, R., Wegener, R.,
Holland, F., Hofzumahaus, A., Kiendler-Scharr, A., Wahner, A., and Fuchs,
H.: Evaluation of OH and HO2 concentrations and their budgets during
photooxidation of 2-methyl-3-butene-2-ol (MBO) in the atmospheric simulation
chamber SAPHIR, Atmos. Chem. Phys., 18, 11409–11422,
https://doi.org/10.5194/acp-18-11409-2018, 2018.
Novelli, A., Vereecken, L., Bohn, B., Dorn, H. P., Gkatzelis, G. I.,
Hofzumahaus, A., Holland, F., Reimer, D., Rohrer, F., Rosanka, S.,
Taraborrelli, D., Tillmann, R., Wegener, R., Yu, Z., Kiendler-Scharr, A.,
Wahner, A., and Fuchs, H.: Importance of isomerization reactions for OH
radical regeneration from the photo-oxidation of isoprene investigated in
the atmospheric simulation chamber SAPHIR, Atmos. Chem. Phys., 20,
3333–3355, https://doi.org/10.5194/acp-20-3333-2020, 2020.
Novelli, A., Cho, C., Fuchs, H., Hofzumahaus, A., Rohrer, F., Tillmann, R.,
Kiendler-Scharr, A., Wahner, A., and Vereecken, L.: Experimental and
theoretical study on the impact of a nitrate group on the chemistry of
alkoxy radicals, Phys. Chem. Chem. Phys., 23, 5474–5495,
https://doi.org/10.1039/d0cp05555g, 2021.
Osthoff, H. D., Roberts, J. M., Ravishankara, A. R., Williams, E. J.,
Lerner, B. M., Sommariva, R., Bates, T. S., Coffman, D., Quinn, P. K., Dibb,
J. E., Stark, H., Burkholder, J. B., Talukdar, R. K., Meagher, J.,
Fehsenfeld, F. C., and Brown, S. S.: High levels of nitryl chloride in the
polluted subtropical marine boundary layer, Nat. Geosci., 1, 324–328,
https://doi.org/10.1038/ngeo177, 2008.
Peeters, J. and Müller, J.-F.: HOx radical regeneration in isoprene
oxidation via peroxy radical isomerisations, II: experimental evidence and
global impact, Phys. Chem. Chem. Phys, 12, 14227–14235,
https://doi.org/10.1039/C0CP00811G, 2010.
Peeters, J., Nguyen, T., and Vereecken, L.: HOx radical regeneration in the
oxidation of isoprene, Phys. Chem. Chem. Phys, 11, 5935–5939,
https://doi.org/10.1039/b908511d, 2009.
Peeters, J., Müller, J. F., Stavrakou, T., and Vinh Son, N.: Hydroxyl
radical recycling in isoprene oxidation driven by hydrogen bonding and
hydrogen tunneling: The upgraded LIM1 mechanism, J. Phys. Chem.. A, 118, 8625–8643,
https://doi.org/10.1021/jp5033146, 2014.
Praske, E., Crounse, J. D., Bates, K. H., Kurtén, T., Kjaergaard, H. G.,
and Wennberg, P. O.: Atmospheric Fate of Methyl Vinyl Ketone: Peroxy Radical
Reactions with NO and HO2, J. Phys. Chem. A, 119, 4562–4572,
https://doi.org/10.1021/jp5107058, 2015.
Ren, X., Harder, H., Martinez, M., Lesher, R. L., Oliger, A., Simpas, J. B.,
Brune, W. H., Schwab, J. J., Demerjian, K. L., He, Y., Zhou, X., and Gao,
H.: OH and HO2 Chemistry in the urban atmosphere of New York City,
Atmos. Environ., 37, 3639–3651, https://doi.org/10.1016/S1352-2310(03)00459-X,
2003.
Ren, X., Brune, W. H., Mao, J., Mitchell, M. J., Lesher, R. L., Simpas, J.
B., Metcalf, A. R., Schwab, J. J., Cai, C., Li, Y., Demerjian, K. L.,
Felton, H. D., Boynton, G., Adams, A., Perry, J., He, Y., Zhou, X., and Hou,
J.: Behavior of OH and HO2 in the winter atmosphere in New York City,
Atmos. Environ., 40, 252–263, https://doi.org/10.1016/j.atmosenv.2005.11.073, 2006.
Ren, X., van Duin, D., Cazorla, M., Chen, S., Mao, J., Zhang, L., Brune, W.
H., Flynn, J. H., Grossberg, N., Lefer, B. L., Rappenglück, B., Wong, K.
W., Tsai, C., Stutz, J., Dibb, J. E., Thomas Jobson, B., Luke, W. T., and
Kelley, P.: Atmospheric oxidation chemistry and ozone production: Results
from SHARP 2009 in Houston, Texas, J. Geophys. Res.-Atmos., 118, 5770–5780,
https://doi.org/10.1002/jgrd.50342, 2013.
Rhew, R. C., Deventer, M. J., Turnipseed, A. A., Warneke, C., Ortega, J.,
Shen, S., Martinez, L., Koss, A., Lerner, B. M., Gilman, J. B., Smith, J.
N., Guenther, A. B., and de Gouw, J. A.: Ethene, propene, butene and
isoprene emissions from a ponderosa pine forest measured by relaxed eddy
accumulation, Atmos. Chem. Phys., 17, 13417–13438,
https://doi.org/10.5194/acp-17-13417-2017, 2017.
Rohrer, F., Bohn, B., Brauers, T., Brüning, D., Johnen, F. J., Wahner,
A., and Kleffmann, J.: Characterisation of the photolytic HONO-source in the
atmosphere simulation chamber SAPHIR, Atmos. Chem. Phys., 5, 2189–2201,
https://doi.org/10.5194/acp-5-2189-2005, 2005.
Rohrer, F., Lu, K., Hofzumahaus, A., Bohn, B., Brauers, T., Chang, C.-C.,
Fuchs, H., Häseler, R., Holland, F., Hu, M., Kita, K., Kondo, Y., Li,
X., Lou, S., Oebel, A., Shao, M., Zeng, L., Zhu, T., Zhang, Y., and Wahner,
A.: Maximum efficiency in the hydroxyl-radical-based self-cleansing of the
troposphere, Nat. Geosci., 7, 559–563, https://doi.org/10.1038/ngeo2199, 2014.
Rolletter, M., Kaminski, M., Acir, I. H., Bohn, B., Dorn, H. P., Li, X.,
Lutz, A., Nehr, S., Rohrer, F., Tillmann, R., Wegener, R., Hofzumahaus, A.,
Kiendler-Scharr, A., Wahner, A., and Fuchs, H.: Investigation of the
á-pinene photooxidation by OH in the atmospheric simulation chamber
SAPHIR, Atmos. Chem. Phys., 19, 11635–11649, https://doi.org/10.5194/acp-19-11635-2019,
2019.
Rolletter, M., Blocquet, M., Kaminski, M., Bohn, B., Dorn, H. P.,
Hofzumahaus, A., Holland, F., Li, X., Rohrer, F., Tillmann, R., Wegener, R.,
Kiendler-Scharr, A., Wahner, A., and Fuchs, H.: Photooxidation of
pinonaldehyde at ambient conditions investigated in the atmospheric
simulation chamber SAPHIR, Atmos. Chem. Phys., 20, 13701–13719,
https://doi.org/10.5194/acp-20-13701-2020, 2020.
Schlosser, E., Bohn, B., Brauers, T., Dorn, H.-P., Fuchs, H., Häseler, R., Hofzumahaus, A., Holland, F., Rohrer, F., Rupp, L. O., Siese, M., Tillmann, R., and Wahner, A.: Intercomparison of two hydroxyl radical measurement techniques at the atmosphere simulation chamber SAPHIR, J. Atmos. Chem., 56, 187–205, https://doi.org/10.1007/s10874-006-9049-3, 2007.
Schlosser, E., Brauers, T., Dorn, H. P., Fuchs, H., Häseler, R., Hofzumahaus, A., Holland, F., Wahner, A., Kanaya, Y., Kajii, Y., Miyamoto, K., Nishida, S., Watanabe, K., Yoshino, A., Kubistin, D., Martinez, M., Rudolf, M., Harder, H., Berresheim, H., Elste, T., Plass-Dülmer, C., Stange, G., and Schurath, U.: Technical Note: Formal blind intercomparison of OH measurements: results from the international campaign HOxComp, Atmos. Chem. Phys., 9, 7923–7948, https://doi.org/10.5194/acp-9-7923-2009, 2009.
Sarkar, C., Guenther, A. B., Park, J. H., Seco, R., Alves, E., Batalha, S.,
Santana, R., Kim, S., Smith, J., Tóta, J., and Vega, O.: PTR-TOF-MS eddy
covariance measurements of isoprene and monoterpene fluxes from an eastern
Amazonian rainforest, Atmos. Chem. Phys., 20, 7179–7191,
https://doi.org/10.5194/acp-20-7179-2020, 2020.
Sillman, S., Logan, J. A., and Wofsy, S. C.: The sensitivity of ozone to
nitrogen oxides and hydrocarbons in regional ozone episodes, J. Geophys.
Res.-Atmos., 95, 1837–1851, https://doi.org/10.1029/JD095iD02p01837, 1990.
Slater, E. J., Whalley, L. K., Woodward-Massey, R., Ye, C., Lee, J. D.,
Squires, F., Hopkins, J. R., Dunmore, R. E., Shaw, M., Hamilton, J. F.,
Lewis, A. C., Crilley, L. R., Kramer, L., Bloss, W., Vu, T., Sun, Y., Xu,
W., Yue, S., Ren, L., Acton, W. J. F., Hewitt, C. N., Wang, X., Fu, P., and
Heard, D. E.: Elevated levels of OH observed in haze events during
wintertime in central Beijing, Atmos. Chem. Phys., 20, 14847–14871,
https://doi.org/10.5194/acp-20-14847-2020, 2020.
Sommariva, R., Bloss, W. J., Brough, N., Carslaw, N., Flynn, M.,
Haggerstone, A. L., Heard, D. E., Hopkins, J. R., Lee, J. D., Lewis, A. C.,
McFiggans, G., Monks, P. S., Penkett, S. A., Pilling, M. J., Plane, J. M.
C., Read, K. A., Saiz-Lopez, A., Rickard, A. R., and Williams, P. I.: OH and
HO2 chemistry during NAMBLEX: roles of oxygenates, halogen oxides and
heterogeneous uptake, Atmos. Chem. Phys., 6, 1135–1153,
https://doi.org/10.5194/acp-6-1135-2006, 2006.
Sommariva, R., Hollis, L. D. J., Sherwen, T., Baker, A. R., Ball, S. M.,
Bandy, B. J., Bell, T. G., Chowdhury, M. N., Cordell, R. L., Evans, M. J.,
Lee, J. D., Reed, C., Reeves, C. E., Roberts, J. M., Yang, M., and Monks, P.
S.: Seasonal and geographical variability of nitryl chloride and its
precursors in Northern Europe, Atmos. Sci. Lett., 19, UNSP e844,
https://doi.org/10.1002/asl.844, 2018.
Song, H., Chen, X., Lu, K., Zou, Q., Tan, Z., Fuchs, H., Wiedensohler, A.,
Moon, D. R., Heard, D. E., Baeza-Romero, M. T., Zheng, M., Wahner, A.,
Kiendler-Scharr, A., and Zhang, Y.: Influence of aerosol copper on HO2
uptake: a novel parameterized equation, Atmos. Chem. Phys., 20, 15835–15850,
https://doi.org/10.5194/acp-20-15835-2020, 2020.
Spirig, C., Neftel, A., Ammann, C., Dommen, J., Grabmer, W., Thielmann, A.,
Schaub, A., Beauchamp, J., Wisthaler, A., and Hansel, A.: Eddy covariance
flux measurements of biogenic VOCs during ECHO 2003 using proton transfer
reaction mass spectrometry, Atmos. Chem. Phys., 5, 465–481,
https://doi.org/10.5194/acp-5-465-2005, 2005.
Stone, D., Whalley, L. K., and Heard, D. E.: Tropospheric OH and HO2
radicals: field measurements and model comparisons, Chem. Soc. Rev., 41,
6348–6404, https://doi.org/10.1039/C2CS35140D, 2012.
Stone, D., Sherwen, T., Evans, M. J., Vaughan, S., Ingham, T., Whalley, L.
K., Edwards, P. M., Read, K. A., Lee, J. D., Moller, S. J., Carpenter, L.
J., Lewis, A. C., and Heard, D. E.: Impacts of bromine and iodine chemistry
on tropospheric OH and HO2: comparing observations with box and global
model perspectives, Atmos. Chem. Phys., 18, 3541–3561,
https://doi.org/10.5194/acp-18-3541-2018, 2018.
Taketani, F., Kanaya, Y., and Akimoto, H.: Kinetics of Heterogeneous
Reactions of HO2 Radical at Ambient Concentration Levels with
(NH4)2SO4 and NaCl Aerosol Particles, J. Phys. Chem.. A, 112,
2370–2377, https://doi.org/10.1021/jp0769936, 2008.
Taketani, F., Kanaya, Y., and Akimoto, H.: Heterogeneous loss of HO2 by
KCl, synthetic sea salt, and natural seawater aerosol particles, Atmos.
Environ., 43, 1660–1665, https://doi.org/10.1016/j.atmosenv.2008.12.010, 2009.
Tan, D., Faloona, I., Simpas, J. B., Brune, W., Shepson, P. B., Couch, T.
L., Sumner, A. L., Carroll, M. A., Thornberry, T., Apel, E., Riemer, D., and
Stockwell, W.: HOx budgets in a deciduous forest: Results from the PROPHET
summer 1998 campaign, J. Geophys. Res.-Atmos., 106, 24407–24427,
https://doi.org/10.1029/2001jd900016, 2001.
Tan, Z., Fuchs, H., Lu, K., Hofzumahaus, A., Bohn, B., Broch, S., Dong, H.,
Gomm, S., Häseler, R., He, L., Holland, F., Li, X., Liu, Y., Lu, S.,
Rohrer, F., Shao, M., Wang, B., Wang, M., Wu, Y., Zeng, L., Zhang, Y.,
Wahner, A., and Zhang, Y.: Radical chemistry at a rural site (Wangdu) in the
North China Plain: observation and model calculations of OH, HO2 and
RO2 radicals, Atmos. Chem. Phys., 17, 663–690,
https://doi.org/10.5194/acp-17-663-2017, 2017.
Tan, Z., Rohrer, F., Lu, K., Ma, X., Bohn, B., Broch, S., Dong, H., Fuchs,
H., Gkatzelis, G. I., Hofzumahaus, A., Holland, F., Li, X., Liu, Y., Liu,
Y., Novelli, A., Shao, M., Wang, H., Wu, Y., Zeng, L., Hu, M.,
Kiendler-Scharr, A., Wahner, A., and Zhang, Y.: Wintertime photochemistry in
Beijing: observations of ROx radical concentrations in the North China Plain
during the BEST-ONE campaign, Atmos. Chem. Phys., 18, 12391–12411,
https://doi.org/10.5194/acp-18-12391-2018, 2018.
Tan, Z., Lu, K., Hofzumahaus, A., Fuchs, H., Bohn, B., Holland, F., Liu, Y.,
Rohrer, F., Shao, M., Sun, K., Wu, Y., Zeng, L., Zhang, Y., Zou, Q.,
Kiendler-Scharr, A., Wahner, A., and Zhang, Y.: Experimental budgets of OH,
HO2, and RO2 radicals and implications for ozone formation in the
Pearl River Delta in China 2014, Atmos. Chem. Phys., 19, 7129–7150,
https://doi.org/10.5194/acp-19-7129-2019, 2019.
Tan, Z., Hofzumahaus, A., Lu, K., Brown, S. S., Holland, F., Huey, L. G.,
Kiendler-Scharr, A., Li, X., Liu, X., Ma, N., Min, K.-E., Rohrer, F., Shao,
M., Wahner, A., Wang, Y., Wiedensohler, A., Wu, Y., Wu, Z., Zeng, L., Zhang,
Y., and Fuchs, H.: No Evidence for a Significant Impact of Heterogeneous
Chemistry on Radical Concentrations in the North China Plain in Summer 2014,
Environ. Sci. Technol., 54, 5973–5979, https://doi.org/10.1021/acs.est.0c00525, 2020.
Tan, Z., Fuchs, H., Hofzumahaus, A., Bloss, W. J., Bohn, B., Cho, C., Hohaus, T., Holland, F., Lakshmisha, C., Liu, L., Monks, P. S., Novelli, A., Niether, D., Rohrer, F., Tillmann, R., Valkenburg, T. S. E., Vardhan, V., Kiendler-Scharr, A., Wahner, A., and Sommariva, R.: Seasonal variation in nitryl chloride and its relation to gas-phase precursors during the JULIAC campaign in Germany, Atmos. Chem. Phys., 22, 13137–13152, https://doi.org/10.5194/acp-22-13137-2022, 2022.
Tanaka, P. L., Riemer, D. D., Chang, S., Yarwood, G., McDonald-Buller, E.
C., Apel, E. C., Orlando, J. J., Silva, P. J., Jimenez, J. L., Canagaratna,
M. R., Neece, J. D., Mullins, C. B., and Allen, D. T.: Direct evidence for
chlorine-enhanced urban ozone formation in Houston, Texas, Atmos. Environ.,
37, 1393–1400, https://doi.org/10.1016/S1352-2310(02)01007-5, 2003.
Teng, A. P., Crounse, J. D., and Wennberg, P. O.: Isoprene peroxy radical
dynamics, J. Am. Chem. Soc., 139, 5367–5377, https://doi.org/10.1021/jacs.6b12838, 2017.
Thornton, J. A., Kercher, J. P., Riedel, T. P., Wagner, N. L., Cozic, J.,
Holloway, J. S., Dubé, W. P., Wolfe, G. M., Quinn, P. K., Middlebrook,
A. M., Alexander, B., and Brown, S. S.: A large atomic chlorine source
inferred from mid-continental reactive nitrogen chemistry, Nature, 464,
271–274, https://doi.org/10.1038/nature08905, 2010.
Vaughan, S., Ingham, T., Whalley, L. K., Stone, D., Evans, M. J., Read, K.
A., Lee, J. D., Moller, S. J., Carpenter, L. J., Lewis, A. C., Fleming, Z.
L., and Heard, D. E.: Seasonal observations of OH and HO2 in the remote
tropical marine boundary layer, Atmos. Chem. Phys., 12, 2149–2172,
https://doi.org/10.5194/acp-12-2149-2012, 2012.
Vilà-Guerau de Arellano, J., van den Dries, K., and Pino, D.: On
inferring isoprene emission surface flux from atmospheric boundary layer
concentration measurements, Atmos. Chem. Phys., 9, 3629–3640,
https://doi.org/10.5194/acp-9-3629-2009, 2009.
Wang, F., Hu, R., Chen, H., Xie, P., Wang, Y., Li, Z., Jin, H., Liu, J., and
Liu, W.: Development of a field system for measurement of tropospheric OH
radical using laser-induced fluorescence technique, Optics Express, 27,
419–435, https://doi.org/10.1364/OE.27.00A419, 2019.
Whalley, L. K., Edwards, P. M., Furneaux, K. L., Goddard, A., Ingham, T.,
Evans, M. J., Stone, D., Hopkins, J. R., Jones, C. E., Karunaharan, A., Lee,
J. D., Lewis, A. C., Monks, P. S., Moller, S. J., and Heard, D. E.:
Quantifying the magnitude of a missing hydroxyl radical source in a tropical
rainforest, Atmos. Chem. Phys., 11, 7223–7233, https://doi.org/10.5194/acp-11-7223-2011,
2011.
Whalley, L. K., Stone, D., Dunmore, R., Hamilton, J., Hopkins, J. R., Lee,
J. D., Lewis, A. C., Williams, P., Kleffmann, J., Laufs, S.,
Woodward-Massey, R., and Heard, D. E.: Understanding in situ ozone
production in the summertime through radical observations and modelling
studies during the Clean air for London project (ClearfLo), Atmos. Chem.
Phys., 18, 2547–2571, https://doi.org/10.5194/acp-18-2547-2018, 2018.
Whalley, L. K., Slater, E. J., Woodward-Massey, R., Ye, C., Lee, J. D.,
Squires, F., Hopkins, J. R., Dunmore, R. E., Shaw, M., Hamilton, J. F.,
Lewis, A. C., Mehra, A., Worrall, S. D., Bacak, A., Bannan, T. J., Coe, H.,
Percival, C. J., Ouyang, B., Jones, R. L., Crilley, L. R., Kramer, L. J.,
Bloss, W. J., Vu, T., Kotthaus, S., Grimmond, S., Sun, Y., Xu, W., Yue, S.,
Ren, L., Acton, W. J. F., Hewitt, C. N., Wang, X., Fu, P., and Heard, D. E.:
Evaluating the sensitivity of radical chemistry and ozone formation to
ambient VOCs and NOx in Beijing, Atmos. Chem. Phys., 21, 2125–2147,
https://doi.org/10.5194/acp-21-2125-2021, 2021.
Winiberg, F. A. F., Dillon, T. J., Orr, S. C., Groß, C. B. M., Bejan,
I., Brumby, C. A., Evans, M. J., Smith, S. C., Heard, D. E., and Seakins, P.
W.: Direct measurements of OH and other product yields from the HO2 + CH3C(O)O2 reaction, Atmos. Chem. Phys., 16, 4023–4042,
https://doi.org/10.5194/acp-16-4023-2016, 2016.
Wolfe, G. M., Thornton, J. A., Bouvier-Brown, N. C., Goldstein, A. H., Park,
J. H., McKay, M., Matross, D. M., Mao, J., Brune, W. H., LaFranchi, B. W.,
Browne, E. C., Min, K. E., Wooldridge, P. J., Cohen, R. C., Crounse, J. D.,
Faloona, I. C., Gilman, J. B., Kuster, W. C., de Gouw, J. A., Huisman, A.,
and Keutsch, F. N.: The Chemistry of Atmosphere-Forest Exchange (CAFE) Model
– Part 2: Application to BEARPEX-2007 observations, Atmos. Chem. Phys., 11,
1269–1294, https://doi.org/10.5194/acp-11-1269-2011, 2011.
Wolfe, G. M., Cantrell, C., Kim, S., Mauldin Iii, R. L., Karl, T., Harley,
P., Turnipseed, A., Zheng, W., Flocke, F., Apel, E. C., Hornbrook, R. S.,
Hall, S. R., Ullmann, K., Henry, S. B., DiGangi, J. P., Boyle, E. S., Kaser,
L., Schnitzhofer, R., Hansel, A., Graus, M., Nakashima, Y., Kajii, Y.,
Guenther, A., and Keutsch, F. N.: Missing peroxy radical sources within a
summertime ponderosa pine forest, Atmos. Chem. Phys., 14, 4715–4732,
https://doi.org/10.5194/acp-14-4715-2014, 2014.
Short summary
With this study, we investigated the processes leading to the formation, destruction, and recycling of radicals for four seasons in a rural environment. Complete knowledge of their chemistry is needed if we are to predict the formation of secondary pollutants from primary emissions. The results highlight a still incomplete understanding of the paths leading to the formation of the OH radical, which has been observed in several other environments as well and needs to be further investigated.
With this study, we investigated the processes leading to the formation, destruction, and...
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