Articles | Volume 24, issue 22
https://doi.org/10.5194/acp-24-12807-2024
© Author(s) 2024. 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-24-12807-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 Nov 2024
Research article |
| 19 Nov 2024
| 19 Nov 2024
Diurnal variation in an amplified canopy urban heat island during heat wave periods in the megacity of Beijing: roles of mountain–valley breeze and urban morphology
Tao Shi
Department of Mathematics and Computer Science, Tongling University, Tongling, 244000, China
Yuanjian Yang
CORRESPONDING AUTHOR
School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing, 210044, China
Ping Qi
Department of Mathematics and Computer Science, Tongling University, Tongling, 244000, China
Simone Lolli
CNR-IMAA, Contrada S. Loja, 85050 Tito Scalo (PZ), Italy
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Mayra I. Oyola, James R. Campbell, Peng Xian, Anthony Bucholtz, Richard A. Ferrare, Sharon P. Burton, Olga Kalashnikova, Benjamin C. Ruston, and Simone Lolli
Atmos. Chem. Phys., 19, 205–218, https://doi.org/10.5194/acp-19-205-2019, https://doi.org/10.5194/acp-19-205-2019, 2019
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We conceptualized the aerosol radiative impact of an inline aerosol analysis field coupled with a global meteorological forecast system utilizing NAAPS and NAVGEM analysis and surface albedo fields. Model simulations were compared with in situ validation data collected during the NASA 2013 SEAC4RS experiment. Instantaneous heating rates peaked around 7 K day-1 in the lower part of the troposphere, while the HSRL profiles resulted in values of up to 18 K day-1 in the in the mid-troposphere.
Fabio Madonna, Marco Rosoldi, Simone Lolli, Francesco Amato, Joshua Vande Hey, Ranvir Dhillon, Yunhui Zheng, Mike Brettle, and Gelsomina Pappalardo
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Simone Lolli, Fabio Madonna, Marco Rosoldi, James R. Campbell, Ellsworth J. Welton, Jasper R. Lewis, Yu Gu, and Gelsomina Pappalardo
Atmos. Meas. Tech., 11, 1639–1651, https://doi.org/10.5194/amt-11-1639-2018, https://doi.org/10.5194/amt-11-1639-2018, 2018
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We evaluate the comparability of aerosol and cloud vertically resolved optical properties obtained with varying lidar profiling techniques and/or data processing methodologies. The discrepancies are assessed by evaluating climate-sensitive direct radiative effects, computed by radiative transfer code means. Results show important discrepancies up to 0.8 W m−2 due to lidar data smoothing in cirrus clouds and a 0.05 W m−2 difference between Raman and elastic lidar technique on a dust layer aloft.
Simone Lolli, James R. Campbell, Jasper R. Lewis, Yu Gu, and Ellsworth J. Welton
Atmos. Chem. Phys., 17, 7025–7034, https://doi.org/10.5194/acp-17-7025-2017, https://doi.org/10.5194/acp-17-7025-2017, 2017
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We compare net TOA radiative forcing between the simplified Corti–Peter (CP) and relatively complex Fu–Liou–Gu models for cirrus clouds observed by NASA MPLNET at Singapore in 2010–11 and Greenbelt, Maryland, in 2012. We find daytime forcing discrepancies up to 65 % between the two, which is greater than previous studies. In some cases, the sign of net TOA daytime forcing also differs. We attribute model differences to numerical simplifications in CP via regression that are not valid globally.
Jeffrey S. Reid, Peng Xian, Brent N. Holben, Edward J. Hyer, Elizabeth A. Reid, Santo V. Salinas, Jianglong Zhang, James R. Campbell, Boon Ning Chew, Robert E. Holz, Arunas P. Kuciauskas, Nofel Lagrosas, Derek J. Posselt, Charles R. Sampson, Annette L. Walker, E. Judd Welton, and Chidong Zhang
Atmos. Chem. Phys., 16, 14041–14056, https://doi.org/10.5194/acp-16-14041-2016, https://doi.org/10.5194/acp-16-14041-2016, 2016
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This paper describes aspects of the 2012 7 Southeast Asian Studies (7SEAS) operations period, the largest within the Maritime Continent. Included were an enhanced deployment of Aerosol Robotic Network (AERONET) sun photometers, multiple lidars, and a Singapore supersite. Simultaneously, a ship was dispatched to the Palawan Archipelago and Sulu Sea of the Philippines for September 2012 to observe transported smoke and pollution as it entered the southwest monsoon trough.
Jeffrey S. Reid, Nofel D. Lagrosas, Haflidi H. Jonsson, Elizabeth A. Reid, Samuel A. Atwood, Thomas J. Boyd, Virendra P. Ghate, Peng Xian, Derek J. Posselt, James B. Simpas, Sherdon N. Uy, Kimo Zaiger, Donald R. Blake, Anthony Bucholtz, James R. Campbell, Boon Ning Chew, Steven S. Cliff, Brent N. Holben, Robert E. Holz, Edward J. Hyer, Sonia M. Kreidenweis, Arunas P. Kuciauskas, Simone Lolli, Min Oo, Kevin D. Perry, Santo V. Salinas, Walter R. Sessions, Alexander Smirnov, Annette L. Walker, Qing Wang, Liya Yu, Jianglong Zhang, and Yongjing Zhao
Atmos. Chem. Phys., 16, 14057–14078, https://doi.org/10.5194/acp-16-14057-2016, https://doi.org/10.5194/acp-16-14057-2016, 2016
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This paper describes aspects of the 2012 7 Southeast Asian Studies (7SEAS) operations period, the largest within the Maritime Continent. Included were an enhanced deployment of Aerosol Robotic Network (AERONET) sun photometers, multiple lidars, and a Singapore supersite. Simultaneously, a ship was dispatched to the Palawan Archipelago and Sulu Sea of the Philippines for September 2012 to observe transported smoke and pollution as it entered the southwest monsoon trough.
T. F. Eck, B. N. Holben, J. S. Reid, A. Arola, R. A. Ferrare, C. A. Hostetler, S. N. Crumeyrolle, T. A. Berkoff, E. J. Welton, S. Lolli, A. Lyapustin, Y. Wang, J. S. Schafer, D. M. Giles, B. E. Anderson, K. L. Thornhill, P. Minnis, K. E. Pickering, C. P. Loughner, A. Smirnov, and A. Sinyuk
Atmos. Chem. Phys., 14, 11633–11656, https://doi.org/10.5194/acp-14-11633-2014, https://doi.org/10.5194/acp-14-11633-2014, 2014
S. Lolli, A. Delaval, C. Loth, A. Garnier, and P. H. Flamant
Atmos. Meas. Tech., 6, 3349–3358, https://doi.org/10.5194/amt-6-3349-2013, https://doi.org/10.5194/amt-6-3349-2013, 2013
Related subject area
Subject: Clouds and Precipitation | Research Activity: Atmospheric Modelling and Data Analysis | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Atmos. Chem. Phys., 25, 157–181, https://doi.org/10.5194/acp-25-157-2025, https://doi.org/10.5194/acp-25-157-2025, 2025
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ERA5 atmospheric reanalysis and airborne in situ observations from IAGOS are compared in terms of the representation of the contrail formation potential and the presence of supersaturation. Differences are traced back to biases in ERA5 relative humidity fields. Those biases are addressed by applying a quantile mapping technique that significantly improved contrail estimation based on post-processed ERA5 data.
Marje Prank, Juha Tonttila, Xiaoxia Shang, Sami Romakkaniemi, and Tomi Raatikainen
Atmos. Chem. Phys., 25, 183–197, https://doi.org/10.5194/acp-25-183-2025, https://doi.org/10.5194/acp-25-183-2025, 2025
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Large primary bioparticles such as pollen can be abundant in the atmosphere. In humid conditions pollen can rupture and release a large number of fine sub-pollen particles (SPPs). The paper investigates what kind of birch pollen concentrations are needed for the pollen and SPPs to start playing a noticeable role in cloud processes and alter precipitation formation. In the studied cases only the largest observed pollen concentrations were able to noticeably alter the precipitation formation.
Luís Filipe Escusa dos Santos, Hannah C. Frostenberg, Alejandro Baró Pérez, Annica M. L. Ekman, Luisa Ickes, and Erik S. Thomson
Atmos. Chem. Phys., 25, 119–142, https://doi.org/10.5194/acp-25-119-2025, https://doi.org/10.5194/acp-25-119-2025, 2025
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The Arctic is experiencing enhanced surface warming. The observed decline in Arctic sea-ice extent is projected to lead to an increase in Arctic shipping activity, which may lead to further climatic feedbacks. Using an atmospheric model and results from marine engine experiments that focused on fuel sulfur content reduction and exhaust wet scrubbing, we investigate how ship exhaust particles influence the properties of Arctic clouds. Implications for radiative surface processes are discussed.
Nadja Omanovic, Brigitta Goger, and Ulrike Lohmann
Atmos. Chem. Phys., 24, 14145–14175, https://doi.org/10.5194/acp-24-14145-2024, https://doi.org/10.5194/acp-24-14145-2024, 2024
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We evaluated the numerical weather model ICON in two horizontal resolutions with two bulk microphysics schemes over hilly and complex terrain in Switzerland and Austria, respectively. We focused on the model's ability to simulate mid-level clouds in summer and winter. By combining observational data from two different field campaigns, we show that an increase in the horizontal resolution and a more advanced cloud microphysics scheme is strongly beneficial for cloud representation.
Cornelis Schwenk and Annette Miltenberger
Atmos. Chem. Phys., 24, 14073–14099, https://doi.org/10.5194/acp-24-14073-2024, https://doi.org/10.5194/acp-24-14073-2024, 2024
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Warm conveyor belts (WCBs) transport moisture into the upper atmosphere, where it acts as a greenhouse gas. This transport is not well understood, and the role of rapidly rising air is unclear. We simulate a WCB and look at fast- and slow-rising air to see how moisture is (differently) transported. We find that for fast-ascending air more ice particles reach higher into the atmosphere and that frozen cloud particles are removed differently than during slow ascent, which has more water vapour.
Jing Yang, Jiaojiao Li, Meilian Chen, Xiaoqin Jing, Yan Yin, Bart Geerts, Zhien Wang, Yubao Liu, Baojun Chen, Shaofeng Hua, Hao Hu, Xiaobo Dong, Ping Tian, Qian Chen, and Yang Gao
Atmos. Chem. Phys., 24, 13833–13848, https://doi.org/10.5194/acp-24-13833-2024, https://doi.org/10.5194/acp-24-13833-2024, 2024
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Detecting unambiguous signatures is vital for examining cloud-seeding impacts, but often, seeding signatures are immersed in natural variability. In this study, reflectivity changes induced by glaciogenic seeding using different AgI concentrations are investigated under various conditions, and a method is developed to estimate the AgI concentration needed to detect unambiguous seeding signatures. The results aid in operational seeding-based decision-making regarding the amount of AgI dispersed.
Florian Sauerland, Niels Souverijns, Anna Possner, Heike Wex, Preben Van Overmeiren, Alexander Mangold, Kwinten Van Weverberg, and Nicole van Lipzig
Atmos. Chem. Phys., 24, 13751–13768, https://doi.org/10.5194/acp-24-13751-2024, https://doi.org/10.5194/acp-24-13751-2024, 2024
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We use a regional climate model, COSMO-CLM², enhanced with a module resolving aerosol processes, to study Antarctic clouds. We prescribe different concentrations of ice-nucleating particles to our model to assess how these clouds respond to concentration changes, validating results with cloud and aerosol observations from the Princess Elisabeth Antarctica station. Our results show that aerosol–cloud interactions vary with temperature, providing valuable insights into Antarctic cloud dynamics.
Yi Li, Xiaoli Liu, and Hengjia Cai
Atmos. Chem. Phys., 24, 13525–13540, https://doi.org/10.5194/acp-24-13525-2024, https://doi.org/10.5194/acp-24-13525-2024, 2024
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The influence of different aerosol modes on cloud processes remains controversial. We modified the aerosol spectra and concentrations to simulate a warm stratiform cloud process in Jiangxi, China, using the WRF-SBM scheme. Research shows that different aerosol spectra have diverse effects on cloud droplet spectra, cloud development, and the correlation between dispersion (ε) and cloud physics quantities. Compared to cloud droplet concentration, ε is more sensitive to the volume radius.
Fabian Hoffmann, Franziska Glassmeier, and Graham Feingold
Atmos. Chem. Phys., 24, 13403–13412, https://doi.org/10.5194/acp-24-13403-2024, https://doi.org/10.5194/acp-24-13403-2024, 2024
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Clouds constitute a major cooling influence on Earth's climate system by reflecting a large fraction of the incident solar radiation back to space. This ability is controlled by the number of cloud droplets, which is governed by the number of aerosol particles in the atmosphere, laying the foundation for so-called aerosol–cloud–climate interactions. In this study, a simple model to understand the effect of aerosol on cloud water is developed and applied.
Andrea Mosso, Thomas Hocking, and Thorsten Mauritsen
Atmos. Chem. Phys., 24, 12793–12806, https://doi.org/10.5194/acp-24-12793-2024, https://doi.org/10.5194/acp-24-12793-2024, 2024
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Clouds play a crucial role in the Earth's energy balance, as they can either warm up or cool down the area they cover depending on their height and depth. They are expected to alter their behaviour under climate change, affecting the warming generated by greenhouse gases. This paper proposes a new method to estimate their overall effect on this warming by simulating a climate where clouds are transparent. Results show that with the model used, clouds have a stabilising effect on climate.
Yao-Sheng Chen, Jianhao Zhang, Fabian Hoffmann, Takanobu Yamaguchi, Franziska Glassmeier, Xiaoli Zhou, and Graham Feingold
Atmos. Chem. Phys., 24, 12661–12685, https://doi.org/10.5194/acp-24-12661-2024, https://doi.org/10.5194/acp-24-12661-2024, 2024
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Marine stratocumulus cloud is a type of shallow cloud that covers the vast areas of Earth's surface. It plays an important role in Earth's energy balance by reflecting solar radiation back to space. We used numerical models to simulate a large number of marine stratocumuli with different characteristics. We found that how the clouds develop throughout the day is affected by the level of humidity in the air above the clouds and how closely the clouds connect to the ocean surface.
Alexei Korolev, Zhipeng Qu, Jason Milbrandt, Ivan Heckman, Mélissa Cholette, Mengistu Wolde, Cuong Nguyen, Greg M. McFarquhar, Paul Lawson, and Ann M. Fridlind
Atmos. Chem. Phys., 24, 11849–11881, https://doi.org/10.5194/acp-24-11849-2024, https://doi.org/10.5194/acp-24-11849-2024, 2024
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The phenomenon of high ice water content (HIWC) occurs in mesoscale convective systems (MCSs) when a large number of small ice particles with typical sizes of a few hundred micrometers is found at high altitudes. It was found that secondary ice production in the vicinity of the melting layer plays a key role in the formation and maintenance of HIWC. This study presents a conceptual model of the formation of HIWC in tropical MCSs based on in situ observations and numerical simulation.
Puja Roy, Robert M. Rauber, and Larry Di Girolamo
Atmos. Chem. Phys., 24, 11653–11678, https://doi.org/10.5194/acp-24-11653-2024, https://doi.org/10.5194/acp-24-11653-2024, 2024
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Cloud droplet temperature and lifetime impact cloud microphysical processes such as the activation of ice-nucleating particles. We investigate the thermal and radial evolution of supercooled cloud droplets and their surrounding environments with an aim to better understand observed enhanced ice formation at supercooled cloud edges. This analysis shows that the magnitude of droplet cooling during evaporation is greater than estimated from past studies, especially for drier environments.
Mathieu Lachapelle, Mélissa Cholette, and Julie M. Thériault
Atmos. Chem. Phys., 24, 11285–11304, https://doi.org/10.5194/acp-24-11285-2024, https://doi.org/10.5194/acp-24-11285-2024, 2024
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Hazardous precipitation types such as ice pellets and freezing rain are difficult to predict because they are associated with complex microphysical processes. Using Predicted Particle Properties (P3), this work shows that secondary ice production processes increase the amount of ice pellets simulated while decreasing the amount of freezing rain. Moreover, the properties of the simulated precipitation compare well with those that were measured.
Andrew DeLaFrance, Lynn A. McMurdie, Angela K. Rowe, and Andrew J. Heymsfield
Atmos. Chem. Phys., 24, 11191–11206, https://doi.org/10.5194/acp-24-11191-2024, https://doi.org/10.5194/acp-24-11191-2024, 2024
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Using a numerical model, the process whereby falling ice crystals accumulate supercooled liquid water droplets is investigated to elucidate its effects on radar-based measurements and surface precipitation. We demonstrate that this process accounted for 55% of the precipitation during a wintertime storm and is uniquely discernable from other ice crystal growth processes in Doppler velocity measurements. These results have implications for measurements from airborne and spaceborne platforms.
Toshi Matsui, Daniel Hernandez-Deckers, Scott E. Giangrande, Thiago S. Biscaro, Ann Fridlind, and Scott Braun
Atmos. Chem. Phys., 24, 10793–10814, https://doi.org/10.5194/acp-24-10793-2024, https://doi.org/10.5194/acp-24-10793-2024, 2024
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Using computer simulations and real measurements, we discovered that storms over the Amazon were narrower but more intense during the dry periods, producing heavier rain and more ice particles in the clouds. Our research showed that cumulus bubbles played a key role in creating these intense storms. This study can improve the representation of the effect of continental and ocean environments on tropical regions' rainfall patterns in simulations.
Ravi Kumar Reddy Addula, Ingrid de Almeida Ribeiro, Valeria Molinero, and Baron Peters
Atmos. Chem. Phys., 24, 10833–10848, https://doi.org/10.5194/acp-24-10833-2024, https://doi.org/10.5194/acp-24-10833-2024, 2024
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Ice nucleation from supercooled droplets is important in many weather and climate modeling efforts. For experiments where droplets are steadily supercooled from the freezing point, our work combines nucleation theory and survival probability analysis to predict the nucleation spectrum, i.e., droplet freezing probabilities vs. temperature. We use the new framework to extract approximately consistent rate parameters from experiments with different cooling rates and droplet sizes.
Jianhao Zhang, Yao-Sheng Chen, Takanobu Yamaguchi, and Graham Feingold
Atmos. Chem. Phys., 24, 10425–10440, https://doi.org/10.5194/acp-24-10425-2024, https://doi.org/10.5194/acp-24-10425-2024, 2024
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Quantifying cloud response to aerosol perturbations presents a major challenge in understanding the human impact on climate. Using a large number of process-resolving simulations of marine stratocumulus, we show that solar heating drives a negative feedback mechanism that buffers the persistent negative trend in cloud water adjustment after sunrise. This finding has implications for the dependence of the cloud cooling effect on the timing of deliberate aerosol perturbations.
Aaron Wang, Steve Krueger, Sisi Chen, Mikhail Ovchinnikov, Will Cantrell, and Raymond A. Shaw
Atmos. Chem. Phys., 24, 10245–10260, https://doi.org/10.5194/acp-24-10245-2024, https://doi.org/10.5194/acp-24-10245-2024, 2024
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We employ two methods to examine a laboratory experiment on clouds with both ice and liquid phases. The first assumes well-mixed properties; the second resolves the spatial distribution of turbulence and cloud particles. Results show that while the trends in mean properties generally align, when turbulence is resolved, liquid droplets are not fully depleted by ice due to incomplete mixing. This underscores the threshold of ice mass fraction in distinguishing mixed-phase clouds from ice clouds.
Theresa Kiszler, Davide Ori, and Vera Schemann
Atmos. Chem. Phys., 24, 10039–10053, https://doi.org/10.5194/acp-24-10039-2024, https://doi.org/10.5194/acp-24-10039-2024, 2024
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Microphysical processes impact the phase-partitioning of clouds. In this study we evaluate these processes while focusing on low-level Arctic clouds. To achieve this we used an extensive simulation set in combination with a new diagnostic tool. This study presents our findings on the relevance of these processes and their behaviour under different thermodynamic regimes.
Shuaiqi Tang, Hailong Wang, Xiang-Yu Li, Jingyi Chen, Armin Sorooshian, Xubin Zeng, Ewan Crosbie, Kenneth L. Thornhill, Luke D. Ziemba, and Christiane Voigt
Atmos. Chem. Phys., 24, 10073–10092, https://doi.org/10.5194/acp-24-10073-2024, https://doi.org/10.5194/acp-24-10073-2024, 2024
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We examined marine boundary layer clouds and their interactions with aerosols in the E3SM single-column model (SCM) for a case study. The SCM shows good agreement when simulating the clouds with high-resolution models. It reproduces the relationship between cloud droplet and aerosol particle number concentrations as produced in global models. However, the relationship between cloud liquid water and droplet number concentration is different, warranting further investigation.
Tim Lüttmer, Peter Spichtinger, and Axel Seifert
EGUsphere, https://doi.org/10.5194/egusphere-2024-2157, https://doi.org/10.5194/egusphere-2024-2157, 2024
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We investigate ice formation pathways in idealized convective clouds using a novel microphysics scheme, that distinguishes between five ice classes each with their unique formation mechanism. Ice crystals from rime splintering forms the lowermost layer of ice crystals around the updraft core. The majority of ice crystals in the anvil of the convective cloud stems from frozen droplets. Ice stemming from homogeneous and deposition nucleation was only relevant in the overshoot.
Suf Lorian and Guy Dagan
Atmos. Chem. Phys., 24, 9323–9338, https://doi.org/10.5194/acp-24-9323-2024, https://doi.org/10.5194/acp-24-9323-2024, 2024
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We examine the combined effect of aerosols and sea surface temperature (SST) on clouds under equilibrium conditions in cloud-resolving radiative–convective equilibrium simulations. We demonstrate that the aerosol–cloud interaction's effect on top-of-atmosphere energy gain strongly depends on the underlying SST, while the shortwave part of the spectrum is significantly more sensitive to SST. Furthermore, increasing aerosols influences upper-troposphere stability and thus anvil cloud fraction.
Jianqi Zhao, Xiaoyan Ma, Johannes Quaas, and Hailing Jia
Atmos. Chem. Phys., 24, 9101–9118, https://doi.org/10.5194/acp-24-9101-2024, https://doi.org/10.5194/acp-24-9101-2024, 2024
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We explore aerosol–cloud interactions in liquid-phase clouds over eastern China and its adjacent ocean in winter based on the WRF-Chem–SBM model, which couples a spectral-bin microphysics scheme and an online aerosol module. Our study highlights the differences in aerosol–cloud interactions between land and ocean and between precipitation clouds and non-precipitation clouds, and it differentiates and quantifies their underlying mechanisms.
Ann Kristin Naumann, Monika Esch, and Bjorn Stevens
EGUsphere, https://doi.org/10.5194/egusphere-2024-2268, https://doi.org/10.5194/egusphere-2024-2268, 2024
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This study explores how uncertainties in the representation of microphysical processes affect the tropical condensate distribution in the global storm-resolving model ICON. The results point to the importance of the fall speed of hydrometeor particles and to a simple relationship: the faster a condensate falls, the less there is of it. Implications for the energy balance and precipitation properties are discussed.
Shiye Huang, Jing Yang, Qian Chen, Jiaojiao Li, Qilin Zhang, and Fengxia Guo
EGUsphere, https://doi.org/10.5194/egusphere-2024-2013, https://doi.org/10.5194/egusphere-2024-2013, 2024
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Aerosol and secondary ice production are both vital to charge separation in thunderstorms, but the relative importance of different SIP processes to cloud electrification under different aerosol conditions is not well understood. In this study, we show in a clean environment, the shattering of freezing drops has the greatest effect on the charging rate, while in a polluted environment, both rime splintering and the shattering of freezing drops have a significant effect on cloud electrification.
Thomas D. DeWitt and Timothy J. Garrett
Atmos. Chem. Phys., 24, 8457–8472, https://doi.org/10.5194/acp-24-8457-2024, https://doi.org/10.5194/acp-24-8457-2024, 2024
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There is considerable disagreement on mathematical parameters that describe the number of clouds of different sizes as well as the size of the largest clouds. Both are key defining characteristics of Earth's atmosphere. A previous study provided an incorrect explanation for the disagreement. Instead, the disagreement may be explained by prior studies not properly accounting for the size of their measurement domain. We offer recommendations for how the domain size can be accounted for.
Sarah Wilson Kemsley, Paulo Ceppi, Hendrik Andersen, Jan Cermak, Philip Stier, and Peer Nowack
Atmos. Chem. Phys., 24, 8295–8316, https://doi.org/10.5194/acp-24-8295-2024, https://doi.org/10.5194/acp-24-8295-2024, 2024
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Aiming to inform parameter selection for future observational constraint analyses, we incorporate five candidate meteorological drivers specifically targeting high clouds into a cloud controlling factor framework within a range of spatial domain sizes. We find a discrepancy between optimal domain size for predicting locally and globally aggregated cloud radiative anomalies and identify upper-tropospheric static stability as an important high-cloud controlling factor.
Ye Liu, Yun Qian, Larry K. Berg, Zhe Feng, Jianfeng Li, Jingyi Chen, and Zhao Yang
Atmos. Chem. Phys., 24, 8165–8181, https://doi.org/10.5194/acp-24-8165-2024, https://doi.org/10.5194/acp-24-8165-2024, 2024
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Deep convection under various large-scale meteorological patterns (LSMPs) shows distinct precipitation features. In southeastern Texas, mesoscale convective systems (MCSs) contribute significantly to precipitation year-round, while isolated deep convection (IDC) is prominent in summer and fall. Self-organizing maps (SOMs) reveal convection can occur without large-scale lifting or moisture convergence. MCSs and IDC events have distinct life cycles influenced by specific LSMPs.
Xiaoran Guo, Jianping Guo, Tianmeng Chen, Ning Li, Fan Zhang, and Yuping Sun
Atmos. Chem. Phys., 24, 8067–8083, https://doi.org/10.5194/acp-24-8067-2024, https://doi.org/10.5194/acp-24-8067-2024, 2024
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The prediction of downhill thunderstorms (DSs) remains elusive. We propose an objective method to identify DSs, based on which enhanced and dissipated DSs are discriminated. A radar wind profiler (RWP) mesonet is used to derive divergence and vertical velocity. The mid-troposphere divergence and prevailing westerlies enhance the intensity of DSs, whereas low-level divergence is observed when the DS dissipates. The findings highlight the key role that an RWP mesonet plays in the evolution of DSs.
Sina Hofer, Klaus Gierens, and Susanne Rohs
Atmos. Chem. Phys., 24, 7911–7925, https://doi.org/10.5194/acp-24-7911-2024, https://doi.org/10.5194/acp-24-7911-2024, 2024
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We try to improve the forecast of ice supersaturation (ISS) and potential persistent contrails using data on dynamical quantities in addition to temperature and relative humidity in a modern kind of regression model. Although the results are improved, they are not good enough for flight routing. The origin of the problem is the strong overlap of probability densities conditioned on cases with and without ice-supersaturated regions (ISSRs) in the important range of 70–100 %.
Harri Kokkola, Juha Tonttila, Silvia Calderón, Sami Romakkaniemi, Antti Lipponen, Aapo Peräkorpi, Tero Mielonen, Edward Gryspeerdt, Timo H. Virtanen, Pekka Kolmonen, and Antti Arola
EGUsphere, https://doi.org/10.5194/egusphere-2024-1964, https://doi.org/10.5194/egusphere-2024-1964, 2024
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Understanding how atmospheric aerosols affect clouds is a scientific challenge. One question is how aerosols affects the amount cloud water. We used a cloud-scale model to study these effects on marine clouds. The study showed that variations in cloud properties and instrument noise can cause bias in satellite derived cloud water content. However, our results suggest that for similar weather conditions with well-defined aerosol concentrations, satellite data can reliably track these effects.
Claudia Christine Stephan and Bjorn Stevens
EGUsphere, https://doi.org/10.5194/egusphere-2024-2020, https://doi.org/10.5194/egusphere-2024-2020, 2024
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Tropical precipitation cluster area and intensity distributions follow power laws, but the physical processes responsible for this behavior remain unknown. We analyze global simulations that realistically represent precipitation processes. We consider Earth-like planets as well as virtual planets to realize different types of large-scale dynamics. Our finding is that power laws in Earth’s precipitation cluster statistics stem from the robust power laws in Earth’s atmospheric wind field.
Naser Mahfouz, Johannes Mülmenstädt, and Susannah Burrows
Atmos. Chem. Phys., 24, 7253–7260, https://doi.org/10.5194/acp-24-7253-2024, https://doi.org/10.5194/acp-24-7253-2024, 2024
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Climate models are our primary tool to probe past, present, and future climate states unlike the more recent observation record. By constructing a hypothetical model configuration, we show that present-day correlations are insufficient to predict a persistent uncertainty in climate projection (how much sun because clouds will reflect in a changing climate). We hope our result will contribute to the scholarly conversation on better utilizing observations to constrain climate uncertainties.
Britta Schäfer, Robert Oscar David, Paraskevi Georgakaki, Julie Thérèse Pasquier, Georgia Sotiropoulou, and Trude Storelvmo
Atmos. Chem. Phys., 24, 7179–7202, https://doi.org/10.5194/acp-24-7179-2024, https://doi.org/10.5194/acp-24-7179-2024, 2024
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Mixed-phase clouds, i.e., clouds consisting of ice and supercooled water, are very common in the Arctic. However, how these clouds form is often not correctly represented in standard weather models. We show that both ice crystal concentrations in the cloud and precipitation from the cloud can be improved in the model when aerosol concentrations are prescribed from observations and when more processes for ice multiplication, i.e., the production of new ice particles from existing ice, are added.
Nan Sun, Gaopeng Lu, and Yunfei Fu
Atmos. Chem. Phys., 24, 7123–7135, https://doi.org/10.5194/acp-24-7123-2024, https://doi.org/10.5194/acp-24-7123-2024, 2024
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Microphysical characteristics of convective overshooting are essential but poorly understood, and we examine them by using the latest data. (1) Convective overshooting events mainly occur over NC (Northeast China) and northern MEC (Middle and East China). (2) Radar reflectivity of convective overshooting over NC accounts for a higher proportion below the zero level, while the opposite is the case for MEC and SC (South China). (3) Droplets of convective overshooting are large but sparse.
Liu Yang, Saisai Ding, Jing-Wu Liu, and Su-Ping Zhang
Atmos. Chem. Phys., 24, 6809–6824, https://doi.org/10.5194/acp-24-6809-2024, https://doi.org/10.5194/acp-24-6809-2024, 2024
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Advection fog occurs when warm and moist air moves over a cold sea surface. In this situation, the temperature of the foggy air usually drops below the sea surface temperature (SST), particularly at night. High-resolution simulations show that the cooling effect of longwave radiation from the top of the fog layer permeates through the fog, resulting in a cooling of the surface air below SST. This study emphasizes the significance of monitoring air temperature to enhance sea fog forecasting.
Nadja Omanovic, Sylvaine Ferrachat, Christopher Fuchs, Jan Henneberger, Anna J. Miller, Kevin Ohneiser, Fabiola Ramelli, Patric Seifert, Robert Spirig, Huiying Zhang, and Ulrike Lohmann
Atmos. Chem. Phys., 24, 6825–6844, https://doi.org/10.5194/acp-24-6825-2024, https://doi.org/10.5194/acp-24-6825-2024, 2024
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We present simulations with a high-resolution numerical weather prediction model to study the growth of ice crystals in low clouds following glaciogenic seeding. We show that the simulated ice crystals grow slower than observed and do not consume as many cloud droplets as measured in the field. This may have implications for forecasting precipitation, as the ice phase is crucial for precipitation at middle and high latitudes.
Matthew W. Christensen, Peng Wu, Adam C. Varble, Heng Xiao, and Jerome D. Fast
Atmos. Chem. Phys., 24, 6455–6476, https://doi.org/10.5194/acp-24-6455-2024, https://doi.org/10.5194/acp-24-6455-2024, 2024
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Clouds are essential to keep Earth cooler by reflecting sunlight back to space. We show that an increase in aerosol concentration suppresses precipitation in clouds, causing them to accumulate water and expand in a polluted environment with stronger turbulence and radiative cooling. This process enhances their reflectance by 51 %. It is therefore prudent to account for cloud fraction changes in assessments of aerosol–cloud interactions to improve predictions of climate change.
Jing Yang, Shiye Huang, Tianqi Yang, Qilin Zhang, Yuting Deng, and Yubao Liu
Atmos. Chem. Phys., 24, 5989–6010, https://doi.org/10.5194/acp-24-5989-2024, https://doi.org/10.5194/acp-24-5989-2024, 2024
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This study contributes to filling the dearth of understanding the impacts of different secondary ice production (SIP) processes on the cloud electrification in cold-season thunderstorms. The results suggest that SIP, especially the rime-splintering process and the shattering of freezing drops, has significant impacts on the charge structure of the storm. In addition, the modeled radar composite reflectivity and flash rate are improved after implementing the SIP processes in the model.
Ulrike Proske, Sylvaine Ferrachat, and Ulrike Lohmann
Atmos. Chem. Phys., 24, 5907–5933, https://doi.org/10.5194/acp-24-5907-2024, https://doi.org/10.5194/acp-24-5907-2024, 2024
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Climate models include treatment of aerosol particles because these influence clouds and radiation. Over time their representation has grown increasingly detailed. This complexity may hinder our understanding of model behaviour. Thus here we simplify the aerosol representation of our climate model by prescribing mean concentrations, which saves run time and helps to discover unexpected model behaviour. We conclude that simplifications provide a new perspective for model study and development.
Wenhui Zhao, Yi Huang, Steven Siems, Michael Manton, and Daniel Harrison
Atmos. Chem. Phys., 24, 5713–5736, https://doi.org/10.5194/acp-24-5713-2024, https://doi.org/10.5194/acp-24-5713-2024, 2024
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We studied how shallow clouds and rain behave over the Great Barrier Reef (GBR) using a detailed weather model. We found that the shape of the land, especially mountains, and particles in the air play big roles in influencing these clouds. Surprisingly, the sea's temperature had a smaller effect. Our research helps us understand the GBR's climate and how various factors can influence it, where the importance of the local cloud in thermal coral bleaching has recently been identified.
Sidiki Sanogo, Olivier Boucher, Nicolas Bellouin, Audran Borella, Kevin Wolf, and Susanne Rohs
Atmos. Chem. Phys., 24, 5495–5511, https://doi.org/10.5194/acp-24-5495-2024, https://doi.org/10.5194/acp-24-5495-2024, 2024
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Relative humidity relative to ice (RHi) is a key variable in the formation of cirrus clouds and contrails. This study shows that the properties of the probability density function of RHi differ between the tropics and higher latitudes. In line with RHi and temperature variability, aircraft are likely to produce more contrails with bioethanol and liquid hydrogen as fuel. The impact of this fuel change decreases with decreasing pressure levels but increases from high latitudes to the tropics.
Zane Dedekind, Ulrike Proske, Sylvaine Ferrachat, Ulrike Lohmann, and David Neubauer
Atmos. Chem. Phys., 24, 5389–5404, https://doi.org/10.5194/acp-24-5389-2024, https://doi.org/10.5194/acp-24-5389-2024, 2024
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Ice particles precipitating into lower clouds from an upper cloud, the seeder–feeder process, can enhance precipitation. A numerical modeling study conducted in the Swiss Alps found that 48 % of observed clouds were overlapping, with the seeder–feeder process occurring in 10 % of these clouds. Inhibiting the seeder–feeder process reduced the surface precipitation and ice particle growth rates, which were further reduced when additional ice multiplication processes were included in the model.
Liine Heikkinen, Daniel G. Partridge, Sara Blichner, Wei Huang, Rahul Ranjan, Paul Bowen, Emanuele Tovazzi, Tuukka Petäjä, Claudia Mohr, and Ilona Riipinen
Atmos. Chem. Phys., 24, 5117–5147, https://doi.org/10.5194/acp-24-5117-2024, https://doi.org/10.5194/acp-24-5117-2024, 2024
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The organic vapor condensation with water vapor (co-condensation) in rising air below clouds is modeled in this work over the boreal forest because the forest air is rich in organic vapors. We show that the number of cloud droplets can increase by 20 % if considering co-condensation. The enhancements are even larger if the air contains many small, naturally produced aerosol particles. Such conditions are most frequently met in spring in the boreal forest.
Kevin Wolf, Nicolas Bellouin, and Olivier Boucher
Atmos. Chem. Phys., 24, 5009–5024, https://doi.org/10.5194/acp-24-5009-2024, https://doi.org/10.5194/acp-24-5009-2024, 2024
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The contrail formation potential and its tempo-spatial distribution are estimated for the North Atlantic flight corridor. Meteorological conditions of temperature and relative humidity are taken from the ERA5 re-analysis and IAGOS. Based on IAGOS flight tracks, crossing length, size, orientation, frequency of occurrence, and overlap of persistent contrail formation areas are determined. The presented conclusions might provide a guide for statistical flight track optimization to reduce contrails.
Franziska Hellmuth, Tim Carlsen, Anne Sophie Daloz, Robert Oscar David, and Trude Storelvmo
EGUsphere, https://doi.org/10.5194/egusphere-2024-754, https://doi.org/10.5194/egusphere-2024-754, 2024
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This article compares the occurrence of supercooled liquid-containing clouds (sLCCs) and their link to surface snowfall in CloudSat-CALIPSO, ERA5, and CMIP6 models. Significant discrepancies were found, with ERA5 and CMIP6 consistently overestimating sLCC and snowfall frequency. This bias is likely due to cloud microphysics parameterization. This conclusion has implications for accurately representing cloud phase and snowfall in future climate projections.
Lucas J. Sterzinger and Adele L. Igel
Atmos. Chem. Phys., 24, 3529–3540, https://doi.org/10.5194/acp-24-3529-2024, https://doi.org/10.5194/acp-24-3529-2024, 2024
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Using idealized large eddy simulations, we find that clouds forming in the Arctic in environments with low concentrations of aerosol particles may be sustained by mixing in new particles through the cloud top. Observations show that higher concentrations of these particles regularly exist above cloud top in concentrations that are sufficient to promote this sustenance.
Andreas Bier, Simon Unterstrasser, Josef Zink, Dennis Hillenbrand, Tina Jurkat-Witschas, and Annemarie Lottermoser
Atmos. Chem. Phys., 24, 2319–2344, https://doi.org/10.5194/acp-24-2319-2024, https://doi.org/10.5194/acp-24-2319-2024, 2024
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Using hydrogen as aviation fuel affects contrails' climate impact. We study contrail formation behind aircraft with H2 combustion. Due to the absence of soot emissions, contrail ice crystals are assumed to form only on ambient particles mixed into the plume. The ice crystal number, which strongly varies with temperature and aerosol number density, is decreased by more than 80 %–90 % compared to kerosene contrails. However H2 contrails can form at lower altitudes due to higher H2O emissions.
Prasanth Prabhakaran, Fabian Hoffmann, and Graham Feingold
Atmos. Chem. Phys., 24, 1919–1937, https://doi.org/10.5194/acp-24-1919-2024, https://doi.org/10.5194/acp-24-1919-2024, 2024
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In this study, we explore the impact of deliberate aerosol perturbation in the northeast Pacific region using large-eddy simulations. Our results show that cloud reflectivity is sensitive to the aerosol sprayer arrangement in the pristine system, whereas in the polluted system it is largely proportional to the total number of aerosol particles injected. These insights would aid in assessing the efficiency of various aerosol injection strategies for climate intervention applications.
Cited articles
Alonso, L. and Renard, F: A new approach for understanding urban microclimate by integrating complementary predictors at different scales in regression and machine learning models, Remote Sens., 12, 2434, https://doi.org/10.3390/rs12152434, 2020.
An, X., Chen, Y., and Lv, S.: Mesoscale simulations of winter low-level wind and temperature fields in Lanzhou city, Plateau Meteorol., 21, 2, 186–192, https://doi.org/10.3321/j.issn:1000-0534.2002.02.011, 2002.
Ao, X., Wang, L., Zhi, X., Gu, W., Yang, H., and Li, D.: Observed synergies between urban heat islands and heat waves and their controlling factors in Shanghai, China, J. Appl. Meteorol. Climatol., 74, 1789–1802, https://doi.org/10.1175/jamc-d-19-0073.1, 2019.
Bady, M., Kato, S., Takahashi, T., and Huang, H.: An experimental investigation of the wind environment and air quality within a densely populated urban street canyon, J. Wind Eng. Indust. Aerodynam., 99, 857–867, https://doi.org/10.1016/j.jweia.2011.06.005, 2011.
Berger, C., Rosentreter, J., Voltersen, M., Baumgart, C., Schmullius, C., and Hese, S.: Spatio-temporal analysis of the relationship between 2D/3D urban site characteristics and land surface temperature, Remote Sens. Environ., 193, 225–243, https://doi.org/10.1016/j.rse.2017.02.020, 2017.
Breiman, L.: Random forest, Mach. Learn., 45, 5–32, 2001.
Cai, H. and Xu, X.: Impacts of built-up area expansion in 2D and 3D on regional surface temperature, Sustainability, 9, 10, https://doi.org/10.3390/su9101862, 2017.
Cai, X., Guo, Y., Liu, H., and Chen, J.: Flow patterns of lower atmosphere over Beijing area, Acta Scientiarum Naturalium Universitatis Pekinensis, 38, 5, 698–704, https://doi.org/10.3321/j.issn:0479-8023.2002.03.015, 2002.
Cao, J., Liu, X., Li, G., and Zou, H.: Analysis of the phenomenon of lake-land breeze in Poyang Lake area, Plateau Meteorol., 34, 426–435, https://doi.org/10.7522/J.ISSN.1000-0534.2013.00197, 2015.
Chen, S., Yang, Y., Deng, F., Zhang, Y., Liu, D., Liu, C., and Gao, Z.: A high-resolution monitoring approach of canopy urban heat island using a random forest model and multi-platform observations, Atmos. Meas. Tech., 15, 735–756, https://doi.org/10.5194/amt-15-735-2022, 2022.
Cutler, D. R., Edwards, T. C., Beard, K. H., Cutler, A., Kyle, T., Gibson, J., Lawler, J. J., Beard, H., and Hess, T.: Random forests for classification in ecology, Ecology, 88, 2783–2792, https://doi.org/10.1890/07-0539.12007, 2007.
Ding, Y.: Scientific questions and answers on climate change, Beijing:China Environmental Science Press, ISBN 9787511128805, 2018.
Dong, Q., Zhao, P., Wang, Y., Miao, S., and Gao, J.: Impact of mountain-valley wind circulation on typical cases of air pollution in Beijing, Environmental Science, 38, 6, 2218–2230, https://doi.org/10.13227/j.hjkx.201609231, 2017.
Dou, J., Wang, Y., and Miao, S.: Fine spatial and temporal characteristics of humidity and wind in Beijing urban area, J. Appl. Meteorol. Sci., 25, 559–569, https://doi.org/10.11898/1001-7313.20140505, 2014.
Drach, P., Krüger, E. L., and Emmanuel, R.: Effects of atmospheric stability and urban morphology on daytime intra-urban temperature variability for Glasgow, UK, Sci. Total Environ., 627, 782–791, https://doi.org/10.1016/j.scitotenv.2018.01.285, 2018.
Fenner, D., Meier, F., Bechtel, B., Otto, M., and Scherer, D.: Intra and inter “local climate zone” variability of air temperature as observed by crowdsourced citizen weather stations in Berlin, Germany, Meteorol. Z., 26, 525–547, https://doi.org/10.1127/metz/2017/0861, 2017.
Founda, D., Pierros, F., Petrakis, M., and Zerefos, C.: Interdecadal variations and trends of the urban heat island in Athens (Greece) and its response to heat waves, Atmos. Res., 161–162, 1–13, https://doi.org/10.1016/j.atmosres.2015.03.016, 2015.
Friedman, J. H.: Greedy function approximation: a gradient boosting machine, Ann. Stat., 29, 1189–1232, https://doi.org/10.1214/aos/1013203451, 2001.
Fu, B.: A method for calculating the velocity and local circulation by wind observation data, J. Meteorol. Sci., 17, 258–267, 1997.
Gao, J., Sun, Y., Liu, Q., Zhou, M., Lu, Y., and Li, L.: Impact of extreme high temperature on mortality and regional level definition of heat wave: A multi-city study in China, Sci. Total Environ., 505, 535–544, https://doi.org/10.1016/j.scitotenv.2014.10.028, 2015.
Gemechu, F. G.: How the interaction of heatwaves and urban heat islands amplify urban warming, Adv. Environ. Eng. Res., 3, 2, https://doi.org/10.21926/aeer.2202022, 2022.
Guo, G., Zhou, X., Wu, Z., Xiao, R., and Chen, Y.: Characterizing the impact of urban morphology heterogeneity on land surface temperature in Guangzhou, China, Environ. Model. Softw., 84, 427–439, https://doi.org/10.1016/j.envsoft.2016.06.021, 2016.
Guo, F., Hu, D., and Schlink, U.: A comprehensive metric scheme for characterizing the heterogeneity of urban thermal landscapes: A case study of 14-year evaluation in Beijing, Ecol. Indicator., 16, 112268–112268, https://doi.org/10.1016/j.ecolind.2024.112268, 2024.
Hang, J., Li, Y., and Sandberg, M.: Experimental and numerical studies of flows through and within high-rise building arrays and their link to ventilation strategy, J. Wind Eng. Indust., 99, 1036–1055, https://doi.org/10.1016/j.envsoft.2016.06.021, 2011.
Hastie, T., Tibshirani, R., and Friedman, J.: The elements of statistical learning: Data mining, inference, and prediction, 2nd Edition, Springer Series in Statistics, Springer, New York, 66, 4, https://doi.org/10.1111/j.1541-0420.2010.01516.x, 2010.
He B.: Potentials of meteorological characteristics and synoptic conditions to mitigate urban heat island effects, Urban Clim., 24, 26–33, https://doi.org/10.1016/j.uclim.2018.01.004, 2018.
Hu, X., Liu, S., Liang, F.,Wang, J., Liu, H., Li, J., and Wang, Y.: Numerical simulation of features of surface boundary-layer over Beijing area, Acta Scientiarum Naturalium Universitatis Pekinensis, 41, 514–522, https://doi.org/10.3321/j.issn:0479-8023.2005.04.003, 2005.
IPCC (Intergovernmental panel on climate change): Climate Change 2021: The physical science basis. Contribution of working group I to the sixth assessment report of the intergovernmental panel on climate change, Cambridge University Press, ISBN 9781009157896, 2023.
Jia, S., J., Wang, Y., Chen, L., and Bi, X.: A novel approach to estimating urban land surface temperature by the combination of geographically weighted regression and deep neural network models, Urban Clim., 47, 101390, https://doi.org/10.1016/j.uclim.2022.101390, 2023.
Jiang, S., Lee, X., Wang, J., and Wang, K.: Amplified urban heat islands during heat wave periods, J. Geophys. Res.-Atmos., 124, 7797–7812, https://doi.org/10.1029/2018jd030230, 2019.
Jiang, W., Xu, Y., and Yu, H.: Fundamentals of boundary layer meteorology, Nanjing: Nanjing University Press, ISBN 9787305025983, 1994.
Khan, H. S., Paolini, R., Santamouris, M., and Caccetta, P.: Exploring the synergies between urban overheating and heatwaves (HWs) in Western Sydney, Energies, 13, 470, https://doi.org/10.3390/en13020470, 2020.
Krayenhoff, E. S. and Voogt, J. A.: Daytime thermal anisotropy of urban neighbourhoods: Morphological causation, Remote Sens., 8, 2, https://doi.org/10.3390/rs8020108, 2016.
Letcher, T. W. and Minder, J. R.: The simulated impact of the snow albedo feedback on the large-scale mountain-plain circulation east of the Colorado Rocky mountains, J. Atmos. Sci., 75, 755–774, https://doi.org/10.1175/JAS-D-17-0166.1, 2018.
Li, Q.: Statistical modeling experiment of land precipitation variations since the start of the 20th Century with external forcing factors, Chinese Sci. Bull., 65, 2266–2278, https://doi.org/10.1360/TB-2020-0305, 2020.
Li, D. and Bou-Zeid, E.: Synergistic interactions between urban heat islands and heat waves: The impact in cities is larger than the sum of its parts, J. Appl. Meteorol. Climatol., 52, 2051–2064, https://doi.org/10.1175/JAMC-D-13-02.1, 2013.
Li, M., Wang, T., Xie, M., Zhuang, B., Li, S., Han, Y., and Cheng, N.: Modeling of urban heat island and its impacts on thermal circulations in the Beijing–Tianjin–Hebei region, China, Theor. Appl. Climatol., 128, 999–1013, https://doi.org/10.1007/s00704-016-1903-x, 2017.
Liu, S., Liu, Z., Li, J., Wang, Y,; Ma, Y., Sheng, L., Liu, H., Liang, F., Xin, G., and Wang, J.: Numerical simulation for the coupling effect of local atmospheric circulations over the area of Beijing, Tianjin and Hebei Province, Sci. China (Series D: Earth Sciences), 52, 382–392, https://doi.org/10.1007/s11430-009-0030-2, 2009.
Liu, W., Ji, C., Zhong, J., Jiang, X., and Zheng, Z.: Temporal characteristics of the Beijing urban heat island, Theor. Appl. Climatol., 87, 213–221, https://doi.org/10.1007/s00704-005-0192-6, 2007.
Merckx, T., Souffreau, C., Kaiser, A., Baardsen, L. F., Backeljau, T.,; Bonte, D., Brans, K. I., Cours, M., Dahirel, M., Debortoli, N.,Wolf, K, D., Engelen, J. M. T., Fontaneto, D., Gianuca, A. T., Govaert, L., Hendrickx, F., Higuti, J., Lens, L., Martens, K., Matheve, H., Matthysen, E., Piano, E., Sablon, R., Schön, L., Doninck, K. V., Meester, L. D., and Dyck, H. V.: Body-size shifts in aquatic and terrestrial urban communities, Nature, 558, 7708, https://doi.org/10.1038/s41586-018-0140-0, 2018.
Miao, Y., Liu, S., Chen, B., Zhang, B., Wang, S., and Li, S.: Simulating urban flow and dispersion in Beijing by coupling a CFD model with the WRF model, Adv. Atmos. Sci., 30, 1663–1678, https://doi.org/10.1007/s00376-013-2234-9, 2013.
Ng, E.: Policies and technical guidelines for urban planning of high-density cities-air ventilation assessment (AVA) of Hong Kong, Build. Environ., 44, 1478–1488, https://doi.org/10.1016/j.buildenv.2008.06.013, 2009.
Ngarambe, J., Nganyiyimana, J., Kim, I., Santamouris, M., and Yun, G. Y.: Synergies between urban heat island and heat waves in Seoul: The role of wind speed and land use characteristics, PLoS ONE, 15, 12, https://doi.org/10.1371/journal.pone.0243571, 2020.
NSTI: Daily Timed Data from automated weather stations in China, China Meteorological Data Service Centre, NSTI [data set], http://data.cma.cn/en/?r=data/detail&dataCode=A.0012.0001 (last access: 1 April 2024), 2024.
Oke, T. R.: Initial guidance to obtain representative meteorological observations at urban sites, University of British Columbia, IOM Rep. 81, WMO/TD-No. 1250, 2004.
Oke, T. R., Mills, G., Christen, A., and Voogt, J. A.: Urban Climates, Cambridge University Press, ISBN 9780521849500, 2017.
Patz, J. A., Campbell-Lendrum, D., Holloway, T., and Foley, J. A.: Impact of regional climate change on human health, Nature, 438, 310–317, https://doi.org/10.1038/nature04188, 2005.
Peng, F., Wong M. S., Ho, H. C., Nichol, J., and Chan, P. W.: Reconstruction of historical datasets for analyzing spatiotemporal influence of built environment on urban microclimates across a compact city, Build. Environ., 123, 649–660, https://doi.org/10.1016/j.buildenv.2017.07.038, 2017.
Radfar, M.: Urban microclimate, designing the spaces between buildings. Housing Stud., 27, 2, 293–294, https://doi.org/10.1080/02673037.2011.615987, 2012.
Rafiee, A., Dias, E., and Koomen, E.: Urban forestry & urban greening Local impact of tree volume on nocturnal urban heat island: a case study in Amsterdam, Urban For Urban Green, 16, 50–61, https://doi.org/10.1016/j.ufug.2016.01.008, 2016.
Rao, K. S. and Snodgrass, H. F.: A nonstationary nocturnal drainage flow model, Bound.-Lay. Meteorol., 20, 309–320, https://doi.org/10.1007/BF00121375, 1981.
Ren, G., Chu, Z., Chen, Z., and Ren, Y.: Implications of temporal change in urban heat island intensity observed at Beijing and Wuhan stations, Geophys. Res. Lett., 34, 5, https://doi.org/10.1029/2006GL027927, 2007.
Ryu, Y. H. and Baik, J. J.: Quantitative analysis of factors contributing to urban heat island intensity, J. Appl. Meteorol. Climatol., 51, 842–854, https://doi.org/10.1175/JAMC-D-11-098.1, 2012.
Scarano, M. and Mancini, F.: Assessing the relationship between sky view factor and land surface temperature to the spatial resolution, International J. Remote Sens., 38, 6910–6929, https://doi.org/10.1080/01431161.2017.1368099, 2017.
Seto, K. C., Guneralp, B., and Hutyra, L. R.: Global forecasts of urban expansion to 2030 and direct impacts on biodiversity and carbon pools, P. Natl. Acad. Sci. USA, 109, 16083–16088, https://doi.org/10.1073/pnas.1211658109, 2012.
Shi, T., Huang, Y., Shi, C., and Yang, Y.: Influence of urbanization on the thermal environment of meteorological stations: Satellite-observational evidence, Adv. Clim. Change Res., 1, 7–15, https://doi.org/10.1016/j.accre.2015.07.001, 2015.
Shiroyama, R. and Yoshimura, C.: Assessing bluegill (Lepomis macrochirus) habitat suitability using partial dependence function combined with classification approaches, Ecol. Inform., 35, 9–18, https://doi.org/10.1016/j.ecoinf.2016.06.005, 2016.
Smola, A. J. and Schölkopf, B.: A tutorial on support vector regression, Stat. Comput., 14, 199–222, https://doi.org/10.1023/B:STCO.0000035301.49549.88, 2004.
Srivanit, M. and Kazunori, H.: The influence of urban morphology indicators on summer diurnal range of urban climate in Bangkok metropolitan area, Thailand, Int. J. Civil Environ. Eng., 11, 34–46, 2011.
Stewart, I. D. and Oke T. R.: Local climate zones for urban temperature studies, B. Am. Meteorol. Soc., 93, 1879–1900, https://doi.org/10.1175/BAMS-D-11-00019.1, 2012.
Stewart, I. D., Oke, T. R., and Krayenhoff, E. S.: Evaluation of the 'local climate zone' scheme using temperature observations and model simulations, Int. J. Climatol., 34, 1062–1080, https://doi.org/10.1002/joc.3746, 2014.
Sun, J., Wang, H., and Yuan, W.: Decadal variability of the extreme hot event in China and its association with atmospheric circulations, Clim. Environ. Res., 16, 199–208, 2011.
Taleghani, M., Sailor, D., and Ban-Weiss, G. A.: Micrometeorological simulations to predict the impacts of heat mitigation strategies on pedestrian thermal comfort in a Los Angeles neighborhood, Environ. Res. Lett., 11, 2, https://doi.org/10.1088/1748-9326/11/2/024003, 2016.
Tan, M., Liu, K., Liu, L.,Zhu, Y., and Wang, D.: Population spatialization of 30 m grid in pearl river delta based on stochastic forest model, Prog. Geogr., 36, 122–130, https://doi.org/10.18306/dlkxjz.2017.10.012, 2017.
Tian, Y. and Miao, J.: Overview of mountain-valley breeze studies in China, Meteorol. Sci. Technol., 47, 11, https://doi.org/10.19517/j.1671-6345.20170777, 2019.
Tian, Y., Zhou, W., Qian, Y., Zheng, Z., and Yan, J.: The effect of urban 2D and 3D morphology on air temperature in residential neighborhoods, Landscape Ecol., 34, 1161–1178, https://doi.org/10.1007/s10980-019-00834-7, 2019.
Tompalski, P. and Wężyk, P.: LiDAR and VHRS Data for Assessing living quality in cities-an approach based on 3D spatial indices, International Archives of the Photogrammetry, Remote Sens. Spatial Inf. Sci., XXXIX-B6, 173–176, https://doi.org/10.5194/isprsarchives-XXXIX-B6-173-2012, 2012.
Unger, J.: Intra-urban relationship between surface geometry and urban heat island: review and new approach, Clim. Res., 27, 253–264, https://doi.org/10.3354/cr0272532004, 2004.
Unger, J., Sümeghy, Z., and Zoboki, J.: Temperature cross-section features in an urban area, Atmos. Res., 58, 117–127, https://doi.org/10.1016/S0169-8095(01)00087-4, 2001.
Wang, X., Wang, C., and Li, Q.: Wind regimes above and below a temperate deciduous forest canopy in complex terrain: Interactions between slope and valley winds, Atmosphere, 6, 60–87, https://doi.org/10.3390/atmos6010060, 2015.
Wang, Y., Zheng, D., and Li, Q.: Urban meteorological disasters. Beijing: China Meteorological Press, ISBN 9787502947163, 2009.
Wei, J. and Sun, J.: The analysis of summer heat wave and sultry weather in North China, Clim. Environ. Res., 12, 453–463, https://doi.org/10.1175/1520-0442(1998)011<3030:acrtai>2.0.co;2, 2007.
Whiteman, C. D. and Doran, J. C.: The relationship between overlying synoptic-scale flows and winds within a valley, J. Appl. Meteorol., 32, 1669–1682, https://doi.org/10.1175/1520-0450(1993)0322.0.CO;2, 1993.
Whiteman, C. D. and Zhong, S.: Downslope flows on a low-angle slope and their interactions with valley inversions, Part I: Observations, J. Appl. Meteorol. Climatol., 47, 2023–2038, https://doi.org/10.1175/2007JAMC1669.1, 2008.
Xie, J., Sun, T., Liu, C., Li, L., Xu, X., Miao, S., Lin, L., Chen, Y., and Fan, S.: Quantitative evaluation of impacts of the steadiness and duration of urban surface wind patterns on air quality, Sci. Total Environ., 850, 157957, https://doi.org/10.1016/j.scitotenv.2022.157957, 2022.
Xu, W. H., Li, Q. X., Wang, X. L., Yang, S., Cao, L., and Feng, Y.: Homogenization of Chinese daily surface air temperatures and analysis of trends in the extreme temperature indices, J. Geophys. Res.-Atmos., 118, 9708–9720, https://doi.org/10.1002/jgrd.50791, 2013.
Xu, Z., Fitzgerald, G., Guo, Y., Jalaludin, B., and Tong, S.: Impact of heatwave on mortality under different heatwave definitions: A systematic review and meta-analysis, Environ. Int., 89–90, 193–203, https://doi.org/10.1016/j.envint.2016.02.007, 2016.
Xue, J., Zong, L., Yang ,Y., Bi, X., Zhang, Y., and Zhao, M.: Diurnal and interannual variations of canopy urban heat island (CUHI) effects over a mountain-valley city with a semi-arid climate, Urban Clim., 48, 101425, https://doi.org/10.1016/j.uclim.2023.101425, 2023.
Yang, J. and Huang, X.: The 30 m annual land cover dataset and its dynamics in China from 1990 to 2019, Earth Syst. Sci. Data, 13, 3907–3925, https://doi.org/10.5194/essd-13-3907-2021, 2021.
Yang, J. and Huang, X.: The 30 m annual land cover datasets and its dynamics in China from 1990 to 2021, in: Earth System Science Data (1.0.1, Vol. 13, Number 1, 3907–3925 pp., Zenodo [data set], https://doi.org/10.5281/zenodo.5816591, 2022.
Yang, J., Su, J., Xia, J., Jin, C., Li, X., and Ge, Q.: The impact of spatial form of urban architecture on the urban thermal environment: A case study of the Zhongshan District, Dalian, China, IEEE J. Select. Top. Appl. Earth Observ. Remote Sens., 11, 2709–2716, https://doi.org/10.1109/JSTARS.2018.2808469, 2018.
Yang, P., Liu, W., Zhong, J., and Yang, J.: Evaluating the quality of temperature measured at automatic weather stations in Beijing, J. Appl. Meteorol. Sci., 22, 706–715, https://doi.org/10.1016/j.buildenv.2023.110180, 2011 (in Chinese).
Yang, P., Ren, G., and Liu, W.: Spatial and temporal characteristics of Beijing urban heat island intensity, J. Appl. Meteorol. Climatol., 52, 1803–1816, https://doi.org/10.1175/JAMC-D-12-0125.1, 2013.
Yang, Y., Guo, M., Wang, L., Zong, L., Liu, D., Zhang, W., Wang, M., Wan, B., and Guo, Y.: Unevenly spatiotemporal distribution of urban excess warming in coastal Shanghai megacity, China: Roles of geophysical environment, ventilation and sea breeze, Build. Environ., 235, 110180, https://doi.org/10.1016/j.buildenv.2023.110180, 2023.
Yang, Y., Luo, F., Xue, J., Zong, L., Tian, W., and Shi, T.: Research progress and perspective on synergy between urban heat waves and canopy urban heat island, Adv. Earth Sci., 39, 1–16, https://doi.org/10.11867/j.issn.1001-8166.2024.032, 2024.
Yang, Y., Zheng, X., Gao, Z., Wang, H., Wang, T., Li, Y., Lau, G. N. C., and Yim, S. H. L.: Long-term trends of persistent synoptic circulation events in planetary boundary layer and their relationships with haze pollution in winter half year over Eastern China, J. Geophys. Res.-Atmos., 123, 10991–11007, https://doi.org/10.1029/2018JD028982, 2018.
Yang, Y., Zheng, Z., Yim, S. Y. L., Roth, M., Ren, G., Gao, Z., Wang, T., Li, Q., Shi, C., and Ning, G.: PM2.5 pollution modulates wintertime urban heat island intensity in the BeijingTianjin-Hebei Megalopolis, China, Geophys. Res. Lett., 47, 1–12, https://doi.org/10.1029/2019GL084288, 2020.
You, C., Cai, X., Song, Y., and Guo, H.: Local atmospheric circulations over Beijing-Tianjin Area in summer, Acta Scientiarum Naturalium Universitatis Pekinensis, 42, 779–783, https://doi.org/10.3321/j.issn:0479-8023.2006.06.015, 2006.
Yu, Z., Chen, S., Wong, N., Ignatius, M., Deng, J., He, Y., and Hii, D. J. C.: Dependence between urban morphology and outdoor air temperature: A tropical campus study using random forests algorithm, Sustain. Cities Soc., 61, 1–12, https://doi.org/10.1016/j.scs.2020.102200, 2020.
Zakšek, K., Oštir, K., and Kokalj, Ž.: Sky-view factor as a relief visualization technique, Remote Sens., 3, 398–415, https://doi.org/10.3390/rs3020398, 2011.
Zängl, G.: The impact of weak synoptic forcing on the valley-wind circulation in the Alpine Inn valley, Meteorol. Atmos. Phys., 105, 37–53, https://doi.org/10.1007/s00703-009-0030-y, 2009.
Zhang, H., Zhu, S., Gao, Y., and Zhang, G.: The relationship between urban spatial morphology parameters and urban heat island intensity under fine weather condition, J. Appl. Meteorol. Sci., 27, 249–256, https://doi.org/10.11898/1001-7313.20160213, 2016.
Zhang, N., Zhu, L. F., and Zhu, Y.: Urban heat island and boundary layer structures under hot weather synoptic conditions: A case study of Suzhou City, China, Adv. Atmos. Sci., 28, 855–865, https://doi.org/10.1007/s00376-010-0040-1, 2011.
Zheng, Z., Ren, G., Wang, H., Dou, J., Gao, Z., Duan, C., Li, Y., Ngarukiyimana, J. P., Zhao, C., Cao, C., Jiang, M., and Yang, Y.: Relationship between fine-particle pollution and the urban heat island in Beijing, China: Observational evidence, Bound.-Lay. Meteorol., 169, 93–113, https://doi.org/10.1007/s10546-018-0362-6, 2018a.
Zheng, Z., Ren, G., and Gao, H.: Analysis of the local circulation in Beijing area, Meteorol. Monthly, 44, 425–433, https://doi.org/10.7519/j.issn.1000-0526.2018.03.009, 2018b.
Zheng, Z., Ren, G., Gao, H., and Yang, Y.: Urban ventilation planning and its associated benefits based on numerical experiments: A case study in beijing, China, Build. Environ., 222, 109383, https://doi.org/10.1016/j.buildenv.2022.109383, 2022.
Zhou, D., Zhao, S., Liu, S., Zhang, L., and Zhu, C.: Surface urban heat island in China's 32 major cities: Spatial patterns and drivers, Remote Sens. Environ., 152, 51–61, https://doi.org/10.1016/j.rse.2014.05.017, 2014.
Zhou, X., Okaze, T., Ren, C., Cai, M., and Mochida, A.: Evaluation of urban heat islands using local climate zones under the influences of sea-Land breeze, Sustain. Cities Soc., 55, 102060, https://doi.org/10.1016/j.scs.2020.102060, 2020.
Zinzi, M., Agnoli, S., Burattini, C., and Mattoni, B.: On the thermal response of buildings under the synergic effect of heat waves and urban heat island, Solar Energy, 211, 1270–1282, https://doi.org/10.1016/j.solener.2020.10.050, 2020.
Zong, L., Liu, S., Yang, Y., Ren, G., Yu, M., Zhang, Y., and Li, Y.: Synergistic influence of local climate zones and wind speeds on the urban heat island and heat waves in the Megacity of Beijing, China, Front. Earth Sci., 9, 673786, https://doi.org/10.3389/feart.2021.673786, 2021.
Zong, L., Yang, Y., Xia, H., Gao, M., Sun, Z., Zheng, Z., Li, X., Ning, G., Li, Y., and Lolli, S.: Joint occurrence of heatwaves and ozone pollution and increased health risks in Beijing, China: role of synoptic weather pattern and urbanization, Atmos. Chem. Phys., 22, 6523–6538, https://doi.org/10.5194/acp-22-6523-2022, 2022.
Short summary
This paper explored the formation mechanisms of the amplified canopy urban heat island intensity (ΔCUHII) during heat wave (HW) periods in the megacity of Beijing from the perspectives of mountain–valley breeze and urban morphology. During the mountain breeze phase, high-rise buildings with lower sky view factors (SVFs) had a pronounced effect on the ΔCUHII. During the valley breeze phase, high-rise buildings exerted a dual influence on the ΔCUHII.
This paper explored the formation mechanisms of the amplified canopy urban heat island intensity...
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