Articles | Volume 18, issue 18
https://doi.org/10.5194/acp-18-13687-2018
© Author(s) 2018. 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-18-13687-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
27 Sep 2018
Research article |
| 27 Sep 2018
| 27 Sep 2018
Surface roughness during depositional growth and sublimation of ice crystals
Jens Voigtländer
Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
Cedric Chou
School of Physics Astronomy and Mathematics, University of Hertfordshire, Hatfield, AL10 9AB, UK
Department of Medicine, University of British Columbia, Vancouver, BC, Canada
Henner Bieligk
Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
Tina Clauss
Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
DBFZ – Deutsches Biomasseforschungszentrum, Torgauer Str. 116, 04347 Leipzig, Germany
Susan Hartmann
Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
Paul Herenz
Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
Dennis Niedermeier
Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
Georg Ritter
School of Physics Astronomy and Mathematics, University of Hertfordshire, Hatfield, AL10 9AB, UK
Frank Stratmann
Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
Zbigniew Ulanowski
CORRESPONDING AUTHOR
School of Physics Astronomy and Mathematics, University of Hertfordshire, Hatfield, AL10 9AB, UK
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Revised manuscript not accepted
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Maria Kezoudi, Matthias Tesche, Helen Smith, Alexandra Tsekeri, Holger Baars, Maximilian Dollner, Víctor Estellés, Johannes Bühl, Bernadett Weinzierl, Zbigniew Ulanowski, Detlef Müller, and Vassilis Amiridis
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Mineral dust concentrations in the diameter range from 0.4 to 14.0 μm were measured with the balloon-borne UCASS optical particle counter. Launches were coordinated with ground-based remote-sensing and airborne in situ measurements during a Saharan dust outbreak over Cyprus. Particle number concentrations reached 50 cm−3 for the diameter range 0.8–13.9 μm. Comparisons with aircraft data show reasonable agreement in magnitude and shape of the particle size distribution.
Sebastian O'Shea, Jonathan Crosier, James Dorsey, Louis Gallagher, Waldemar Schledewitz, Keith Bower, Oliver Schlenczek, Stephan Borrmann, Richard Cotton, Christopher Westbrook, and Zbigniew Ulanowski
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The number, shape, and size of ice crystals in clouds are important properties that influence the Earth's radiation budget, cloud evolution, and precipitation formation. This work suggests that one of the most widely used methods for in situ measurements of these properties has significant uncertainties and biases. We suggest methods that dramatically improve these measurements, which can be applied to past and future datasets from these instruments.
Vasiliki Daskalopoulou, Sotirios A. Mallios, Zbigniew Ulanowski, George Hloupis, Anna Gialitaki, Ioanna Tsikoudi, Konstantinos Tassis, and Vassilis Amiridis
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Joseph Girdwood, Helen Smith, Warren Stanley, Zbigniew Ulanowski, Chris Stopford, Charles Chemel, Konstantinos-Matthaios Doulgeris, David Brus, David Campbell, and Robert Mackenzie
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Manuela van Pinxteren, Khanneh Wadinga Fomba, Nadja Triesch, Christian Stolle, Oliver Wurl, Enno Bahlmann, Xianda Gong, Jens Voigtländer, Heike Wex, Tiera-Brandy Robinson, Stefan Barthel, Sebastian Zeppenfeld, Erik Hans Hoffmann, Marie Roveretto, Chunlin Li, Benoit Grosselin, Veronique Daële, Fabian Senf, Dominik van Pinxteren, Malena Manzi, Nicolás Zabalegui, Sanja Frka, Blaženka Gašparović, Ryan Pereira, Tao Li, Liang Wen, Jiarong Li, Chao Zhu, Hui Chen, Jianmin Chen, Björn Fiedler, Wolf von Tümpling, Katie Alana Read, Shalini Punjabi, Alastair Charles Lewis, James Roland Hopkins, Lucy Jane Carpenter, Ilka Peeken, Tim Rixen, Detlef Schulz-Bull, María Eugenia Monge, Abdelwahid Mellouki, Christian George, Frank Stratmann, and Hartmut Herrmann
Atmos. Chem. Phys., 20, 6921–6951, https://doi.org/10.5194/acp-20-6921-2020, https://doi.org/10.5194/acp-20-6921-2020, 2020
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Dennis Niedermeier, Jens Voigtländer, Silvio Schmalfuß, Daniel Busch, Jörg Schumacher, Raymond A. Shaw, and Frank Stratmann
Atmos. Meas. Tech., 13, 2015–2033, https://doi.org/10.5194/amt-13-2015-2020, https://doi.org/10.5194/amt-13-2015-2020, 2020
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Xianda Gong, Heike Wex, Jens Voigtländer, Khanneh Wadinga Fomba, Kay Weinhold, Manuela van Pinxteren, Silvia Henning, Thomas Müller, Hartmut Herrmann, and Frank Stratmann
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Xianda Gong, Heike Wex, Manuela van Pinxteren, Nadja Triesch, Khanneh Wadinga Fomba, Jasmin Lubitz, Christian Stolle, Tiera-Brandy Robinson, Thomas Müller, Hartmut Herrmann, and Frank Stratmann
Atmos. Chem. Phys., 20, 1451–1468, https://doi.org/10.5194/acp-20-1451-2020, https://doi.org/10.5194/acp-20-1451-2020, 2020
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In this study, we examined number concentrations of ice nucleating particles (INPs) at Cabo Verde in the oceanic sea surface microlayer and underlying seawater, in the air close to both sea level and cloud level, and in cloud water. The results show that most INPs are supermicron in size, that INP number concentrations in air fit well to those in cloud water and that sea spray aerosols at maximum contributed a small fraction of all INPs in the air at Cabo Verde.
Helen R. Smith, Zbigniew Ulanowski, Paul H. Kaye, Edwin Hirst, Warren Stanley, Richard Kaye, Andreas Wieser, Chris Stopford, Maria Kezoudi, Joseph Girdwood, Richard Greenaway, and Robert Mackenzie
Atmos. Meas. Tech., 12, 6579–6599, https://doi.org/10.5194/amt-12-6579-2019, https://doi.org/10.5194/amt-12-6579-2019, 2019
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The Universal Cloud and Aerosol Sounding System (UCASS) is a low-cost miniature optical particle counter (OPC) capable of sizing particles in the size range 0.4–40 μm. The open-geometry design makes the instrument suitable for deployment on balloon-borne sounding systems, dropsonde systems or as part of an unmanned aerial vehicle (UAV). Laboratory and field experiments show good agreement with reference instruments in a range of cloudy and dusty environments.
Valentin Duflot, Pierre Tulet, Olivier Flores, Christelle Barthe, Aurélie Colomb, Laurent Deguillaume, Mickael Vaïtilingom, Anne Perring, Alex Huffman, Mark T. Hernandez, Karine Sellegri, Ellis Robinson, David J. O'Connor, Odessa M. Gomez, Frédéric Burnet, Thierry Bourrianne, Dominique Strasberg, Manon Rocco, Allan K. Bertram, Patrick Chazette, Julien Totems, Jacques Fournel, Pierre Stamenoff, Jean-Marc Metzger, Mathilde Chabasset, Clothilde Rousseau, Eric Bourrianne, Martine Sancelme, Anne-Marie Delort, Rachel E. Wegener, Cedric Chou, and Pablo Elizondo
Atmos. Chem. Phys., 19, 10591–10618, https://doi.org/10.5194/acp-19-10591-2019, https://doi.org/10.5194/acp-19-10591-2019, 2019
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The Forests gAses aeRosols Clouds Exploratory (FARCE) campaign was conducted in March–April 2015 on the tropical island of La Réunion. For the first time, several scientific teams from different disciplines collaborated to provide reference measurements and characterization of La Réunion vegetation, volatile organic compounds (VOCs), biogenic VOCs (BVOCs), (bio)aerosols and composition of clouds, with a strong focus on the Maïdo mount slope area.
Luis A. Ladino, Graciela B. Raga, Harry Alvarez-Ospina, Manuel A. Andino-Enríquez, Irma Rosas, Leticia Martínez, Eva Salinas, Javier Miranda, Zyanya Ramírez-Díaz, Bernardo Figueroa, Cedric Chou, Allan K. Bertram, Erika T. Quintana, Luis A. Maldonado, Agustín García-Reynoso, Meng Si, and Victoria E. Irish
Atmos. Chem. Phys., 19, 6147–6165, https://doi.org/10.5194/acp-19-6147-2019, https://doi.org/10.5194/acp-19-6147-2019, 2019
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This study presents results obtained during a field campaign conducted in the tropical village of Sisal located on the coast of the Gulf of Mexico. Air masses arriving in Sisal during the passage of cold fronts have surprisingly higher ice-nucleating particle (INP) concentrations than the campaign average. The high concentrations of INPs at T > −15 C and the supermicron size of the INPs suggest that biological particles may have been a significant contributor to the INP population in Sisal.
Zamin A. Kanji, Ryan C. Sullivan, Monika Niemand, Paul J. DeMott, Anthony J. Prenni, Cédric Chou, Harald Saathoff, and Ottmar Möhler
Atmos. Chem. Phys., 19, 5091–5110, https://doi.org/10.5194/acp-19-5091-2019, https://doi.org/10.5194/acp-19-5091-2019, 2019
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Paolo Dandini, Zbigniew Ulanowski, David Campbell, and Richard Kaye
Atmos. Meas. Tech., 12, 1295–1309, https://doi.org/10.5194/amt-12-1295-2019, https://doi.org/10.5194/amt-12-1295-2019, 2019
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The halo ratio indicates the strength of the 22° cirrus halo and gives valuable information on cloud properties. We obtain it from all-sky images by applying a range of transformations and corrections and averaging brightness azimuthally over sun-centred images. The ratio is then taken at two angles from the sun, 20° and 23°, in variance from previous suggestions. While we find ratios > 1 to be linked to halos, they can also occur under scattered cumuli as artefacts due to cloud edges.
Paul J. DeMott, Ottmar Möhler, Daniel J. Cziczo, Naruki Hiranuma, Markus D. Petters, Sarah S. Petters, Franco Belosi, Heinz G. Bingemer, Sarah D. Brooks, Carsten Budke, Monika Burkert-Kohn, Kristen N. Collier, Anja Danielczok, Oliver Eppers, Laura Felgitsch, Sarvesh Garimella, Hinrich Grothe, Paul Herenz, Thomas C. J. Hill, Kristina Höhler, Zamin A. Kanji, Alexei Kiselev, Thomas Koop, Thomas B. Kristensen, Konstantin Krüger, Gourihar Kulkarni, Ezra J. T. Levin, Benjamin J. Murray, Alessia Nicosia, Daniel O'Sullivan, Andreas Peckhaus, Michael J. Polen, Hannah C. Price, Naama Reicher, Daniel A. Rothenberg, Yinon Rudich, Gianni Santachiara, Thea Schiebel, Jann Schrod, Teresa M. Seifried, Frank Stratmann, Ryan C. Sullivan, Kaitlyn J. Suski, Miklós Szakáll, Hans P. Taylor, Romy Ullrich, Jesus Vergara-Temprado, Robert Wagner, Thomas F. Whale, Daniel Weber, André Welti, Theodore W. Wilson, Martin J. Wolf, and Jake Zenker
Atmos. Meas. Tech., 11, 6231–6257, https://doi.org/10.5194/amt-11-6231-2018, https://doi.org/10.5194/amt-11-6231-2018, 2018
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The ability to measure ice nucleating particles is vital to quantifying their role in affecting clouds and precipitation. Methods for measuring droplet freezing were compared while co-sampling relevant particle types. Measurement correspondence was very good for ice nucleating particles of bacterial and natural soil origin, and somewhat more disparate for those of mineral origin. Results reflect recently improved capabilities and provide direction toward addressing remaining measurement issues.
Paul J. DeMott, Thomas C. J. Hill, Markus D. Petters, Allan K. Bertram, Yutaka Tobo, Ryan H. Mason, Kaitlyn J. Suski, Christina S. McCluskey, Ezra J. T. Levin, Gregory P. Schill, Yvonne Boose, Anne Marie Rauker, Anna J. Miller, Jake Zaragoza, Katherine Rocci, Nicholas E. Rothfuss, Hans P. Taylor, John D. Hader, Cedric Chou, J. Alex Huffman, Ulrich Pöschl, Anthony J. Prenni, and Sonia M. Kreidenweis
Atmos. Chem. Phys., 17, 11227–11245, https://doi.org/10.5194/acp-17-11227-2017, https://doi.org/10.5194/acp-17-11227-2017, 2017
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The consistency and complementarity of different methods for measuring the numbers of particles capable of forming ice in clouds are examined in the atmosphere. Four methods for collecting particles for later (offline) freezing studies are compared to a common instantaneous method. Results support very good agreement in many cases but also biases that require further research. Present capabilities and uncertainties for obtaining global data on these climate-relevant aerosols are thus defined.
Victoria E. Irish, Pablo Elizondo, Jessie Chen, Cédric Chou, Joannie Charette, Martine Lizotte, Luis A. Ladino, Theodore W. Wilson, Michel Gosselin, Benjamin J. Murray, Elena Polishchuk, Jonathan P. D. Abbatt, Lisa A. Miller, and Allan K. Bertram
Atmos. Chem. Phys., 17, 10583–10595, https://doi.org/10.5194/acp-17-10583-2017, https://doi.org/10.5194/acp-17-10583-2017, 2017
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The ocean is a possible source of atmospheric ice-nucleating particles (INPs). In this study we found that INPs were ubiquitous in the sea-surface microlayer and bulk seawater in the Canadian Arctic. A strong negative correlation was observed between salinity and freezing temperatures (after correcting for freezing point depression). Heat and filtration treatments of the samples showed that the INPs were likely biological material with sizes between 0.02 μm and 0.2 μm in diameter.
Leonid Nichman, Emma Järvinen, James Dorsey, Paul Connolly, Jonathan Duplissy, Claudia Fuchs, Karoliina Ignatius, Kamalika Sengupta, Frank Stratmann, Ottmar Möhler, Martin Schnaiter, and Martin Gallagher
Atmos. Meas. Tech., 10, 3231–3248, https://doi.org/10.5194/amt-10-3231-2017, https://doi.org/10.5194/amt-10-3231-2017, 2017
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Optical probes are frequently used for the detection of cloud particles. The detected microphysical properties may affect particle growth and accretion mechanisms and the light scattering properties of cirrus clouds. In the CLOUD chamber study at CERN, we compared four optical measurement techniques. We show that shape derivation alone is not sufficient to determine the phase of the small cloud particles. None of the instruments were able to unambiguously determine the phase of small particles.
Sarvesh Garimella, Thomas Bjerring Kristensen, Karolina Ignatius, Andre Welti, Jens Voigtländer, Gourihar R. Kulkarni, Frank Sagan, Gregory Lee Kok, James Dorsey, Leonid Nichman, Daniel Alexander Rothenberg, Michael Rösch, Amélie Catharina Ruth Kirchgäßner, Russell Ladkin, Heike Wex, Theodore W. Wilson, Luis Antonio Ladino, Jon P. D. Abbatt, Olaf Stetzer, Ulrike Lohmann, Frank Stratmann, and Daniel James Cziczo
Atmos. Meas. Tech., 9, 2781–2795, https://doi.org/10.5194/amt-9-2781-2016, https://doi.org/10.5194/amt-9-2781-2016, 2016
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The SPectrometer for Ice Nuclei (SPIN) is a commercially available ice nuclei counter manufactured by Droplet Measurement Technologies in Boulder, CO. This study characterizes the SPIN chamber, reporting data from laboratory measurements and quantifying uncertainties. Overall, we report that the SPIN is able to reproduce previous CFDC ice nucleation measurements.
Markus Hermann, Andreas Weigelt, Denise Assmann, Sascha Pfeifer, Thomas Müller, Thomas Conrath, Jens Voigtländer, Jost Heintzenberg, Alfred Wiedensohler, Bengt G. Martinsson, Terry Deshler, Carl A. M. Brenninkmeijer, and Andreas Zahn
Atmos. Meas. Tech., 9, 2179–2194, https://doi.org/10.5194/amt-9-2179-2016, https://doi.org/10.5194/amt-9-2179-2016, 2016
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Aerosol particles are an important component of the Earth's atmosphere. Here we describe the composition and characterization of a new optical particle size spectrometer (OPSS) for aircraft-borne measurements of the aerosol particle size distribution (how many particles there are with a certain size) in the 140–1050 nm size range. The OPSS was characterized throughout concerning its measurement capabilities (response, pressure dependence, coincidence) and validated versus balloon measurement.
Martin Schnaiter, Emma Järvinen, Paul Vochezer, Ahmed Abdelmonem, Robert Wagner, Olivier Jourdan, Guillaume Mioche, Valery N. Shcherbakov, Carl G. Schmitt, Ugo Tricoli, Zbigniew Ulanowski, and Andrew J. Heymsfield
Atmos. Chem. Phys., 16, 5091–5110, https://doi.org/10.5194/acp-16-5091-2016, https://doi.org/10.5194/acp-16-5091-2016, 2016
Z. Ulanowski, P. H. Kaye, E. Hirst, R. S. Greenaway, R. J. Cotton, E. Hesse, and C. T. Collier
Atmos. Chem. Phys., 14, 1649–1662, https://doi.org/10.5194/acp-14-1649-2014, https://doi.org/10.5194/acp-14-1649-2014, 2014
Related subject area
Subject: Clouds and Precipitation | Research Activity: Laboratory Studies | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
Stable and unstable fall motions of plate-like ice crystal analogues
Secondary ice production – no evidence of efficient rime-splintering mechanism
Fragmentation of ice particles: laboratory experiments on graupel–graupel and graupel–snowflake collisions
Molecular simulations reveal that heterogeneous ice nucleation occurs at higher temperatures in water under capillary tension
Measurement of the collision rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber
Re-evaluating cloud chamber constraints on depositional ice growth in cirrus clouds – Part 1: Model description and sensitivity tests
Ice nucleation by smectites: the role of the edges
A single-parameter hygroscopicity model for functionalized insoluble aerosol surfaces
Mexican agricultural soil dust as a source of ice nucleating particles
The impact of (bio-)organic substances on the ice nucleation activity of the K-feldspar microcline in aqueous solutions
Secondary ice production during the break-up of freezing water drops on impact with ice particles
High homogeneous freezing onsets of sulfuric acid aerosol at cirrus temperatures
Laboratory and field studies of ice-nucleating particles from open-lot livestock facilities in Texas
Comment on “Review of experimental studies of secondary ice production” by Korolev and Leisner (2020)
Effect of chemically induced fracturing on the ice nucleation activity of alkali feldspar
Ice nucleation ability of ammonium sulfate aerosol particles internally mixed with secondary organics
Ice-nucleating particles in precipitation samples from the Texas Panhandle
Comparative study on immersion freezing utilizing single-droplet levitation methods
Exploratory experiments on pre-activated freezing nucleation on mercuric iodide
Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals
Review of experimental studies of secondary ice production
The role of contact angle and pore width on pore condensation and freezing
Technical note: Equilibrium droplet size distributions in a turbulent cloud chamber with uniform supersaturation
Protein aggregates nucleate ice: the example of apoferritin
No anomalous supersaturation in ultracold cirrus laboratory experiments
Lateral facet growth of ice and snow – Part 1: Observations and applications to secondary habits
The ice-nucleating ability of quartz immersed in water and its atmospheric importance compared to K-feldspar
Ice nucleation properties of K-feldspar polymorphs and plagioclase feldspars
Enhanced ice nucleation activity of coal fly ash aerosol particles initiated by ice-filled pores
A comprehensive characterization of ice nucleation by three different types of cellulose particles immersed in water
Activation of intact bacteria and bacterial fragments mixed with agar as cloud droplets and ice crystals in cloud chamber experiments
Anomalous holiday precipitation over southern China
Coal fly ash: linking immersion freezing behavior and physicochemical particle properties
Ice nucleation abilities of soot particles determined with the Horizontal Ice Nucleation Chamber
The efficiency of secondary organic aerosol particles acting as ice-nucleating particles under mixed-phase cloud conditions
Uncertainty in counting ice nucleating particles with continuous flow diffusion chambers
Experimental evidence of the rear capture of aerosol particles by raindrops
Refreeze experiments with water droplets containing different types of ice nuclei interpreted by classical nucleation theory
Pre-activation of aerosol particles by ice preserved in pores
Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide – Part 1: Immersion freezing
A comparative study of K-rich and Na/Ca-rich feldspar ice-nucleating particles in a nanoliter droplet freezing assay
Ice nucleation efficiency of AgI: review and new insights
The adsorption of fungal ice-nucleating proteins on mineral dusts: a terrestrial reservoir of atmospheric ice-nucleating particles
Exploring an approximation for the homogeneous freezing temperature of water droplets
Cloud chamber experiments on the origin of ice crystal complexity in cirrus clouds
Phase transition observations and discrimination of small cloud particles by light polarization in expansion chamber experiments
Analysis of isothermal and cooling-rate-dependent immersion freezing by a unifying stochastic ice nucleation model
Pre-activation of ice-nucleating particles by the pore condensation and freezing mechanism
Influence of the ambient humidity on the concentration of natural deposition-mode ice-nucleating particles
Comparison of measured and calculated collision efficiencies at low temperatures
Jennifer R. Stout, Christopher D. Westbrook, Thorwald H. M. Stein, and Mark W. McCorquodale
Atmos. Chem. Phys., 24, 11133–11155, https://doi.org/10.5194/acp-24-11133-2024, https://doi.org/10.5194/acp-24-11133-2024, 2024
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This study uses 3D-printed ice crystal analogues falling in a water–glycerine mix and observed with multi-view cameras, simulating atmospheric conditions. Four types of motion are observed: stable, zigzag, transitional, and spiralling. Particle shape strongly influences motion; complex shapes have a wider range of conditions where they fall steadily compared to simple plates. The most common orientation of unstable particles is non-horizontal, contrary to prior assumptions of always horizontal.
Johanna S. Seidel, Alexei A. Kiselev, Alice Keinert, Frank Stratmann, Thomas Leisner, and Susan Hartmann
Atmos. Chem. Phys., 24, 5247–5263, https://doi.org/10.5194/acp-24-5247-2024, https://doi.org/10.5194/acp-24-5247-2024, 2024
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Clouds often contain several thousand times more ice crystals than aerosol particles catalyzing ice formation. This phenomenon, commonly known as ice multiplication, is often explained by secondary ice formation due to the collisions between falling ice particles and droplets. In this study, we mimic this riming process. Contrary to earlier experiments, we found no efficient ice multiplication, which fundamentally questions the importance of the rime-splintering mechanism.
Pierre Grzegorczyk, Sudha Yadav, Florian Zanger, Alexander Theis, Subir K. Mitra, Stephan Borrmann, and Miklós Szakáll
Atmos. Chem. Phys., 23, 13505–13521, https://doi.org/10.5194/acp-23-13505-2023, https://doi.org/10.5194/acp-23-13505-2023, 2023
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Secondary ice production generates high concentrations of ice crystals in clouds. These processes have been poorly understood. We conducted experiments at the wind tunnel laboratory of the Johannes Gutenberg University, Mainz, on graupel–graupel and graupel–snowflake collisions. From these experiments fragment number, size, cross-sectional area, and aspect ratio were determined.
Elise Rosky, Will Cantrell, Tianshu Li, Issei Nakamura, and Raymond A. Shaw
Atmos. Chem. Phys., 23, 10625–10642, https://doi.org/10.5194/acp-23-10625-2023, https://doi.org/10.5194/acp-23-10625-2023, 2023
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Using computer simulations of water, we find that water under tension freezes more easily than under normal conditions. A linear equation describes how freezing temperature increases with tension. Accordingly, simulations show that naturally occurring tension in water capillary bridges leads to higher freezing temperatures. This work is an early step in determining if atmospheric cloud droplets freeze due to naturally occurring tension, for example, during processes such as droplet collisions.
Joschka Pfeifer, Naser G. A. Mahfouz, Benjamin C. Schulze, Serge Mathot, Dominik Stolzenburg, Rima Baalbaki, Zoé Brasseur, Lucia Caudillo, Lubna Dada, Manuel Granzin, Xu-Cheng He, Houssni Lamkaddam, Brandon Lopez, Vladimir Makhmutov, Ruby Marten, Bernhard Mentler, Tatjana Müller, Antti Onnela, Maxim Philippov, Ana A. Piedehierro, Birte Rörup, Meredith Schervish, Ping Tian, Nsikanabasi S. Umo, Dongyu S. Wang, Mingyi Wang, Stefan K. Weber, André Welti, Yusheng Wu, Marcel Zauner-Wieczorek, Antonio Amorim, Imad El Haddad, Markku Kulmala, Katrianne Lehtipalo, Tuukka Petäjä, António Tomé, Sander Mirme, Hanna E. Manninen, Neil M. Donahue, Richard C. Flagan, Andreas Kürten, Joachim Curtius, and Jasper Kirkby
Atmos. Chem. Phys., 23, 6703–6718, https://doi.org/10.5194/acp-23-6703-2023, https://doi.org/10.5194/acp-23-6703-2023, 2023
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Attachment rate coefficients between ions and charged aerosol particles determine their lifetimes and may also influence cloud dynamics and aerosol processing. Here we present novel experiments that measure ion–aerosol attachment rate coefficients for multiply charged aerosol particles under atmospheric conditions in the CERN CLOUD chamber. Our results provide experimental discrimination between various theoretical models.
Kara D. Lamb, Jerry Y. Harrington, Benjamin W. Clouser, Elisabeth J. Moyer, Laszlo Sarkozy, Volker Ebert, Ottmar Möhler, and Harald Saathoff
Atmos. Chem. Phys., 23, 6043–6064, https://doi.org/10.5194/acp-23-6043-2023, https://doi.org/10.5194/acp-23-6043-2023, 2023
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This study investigates how ice grows directly from vapor in cirrus clouds by comparing observations of populations of ice crystals growing in a cloud chamber against models developed in the context of single-crystal laboratory studies. We demonstrate that previous discrepancies between different experimental measurements do not necessarily point to different physical interpretations but are rather due to assumptions that were made in terms of how experiments were modeled in previous studies.
Anand Kumar, Kristian Klumpp, Chen Barak, Giora Rytwo, Michael Plötze, Thomas Peter, and Claudia Marcolli
Atmos. Chem. Phys., 23, 4881–4902, https://doi.org/10.5194/acp-23-4881-2023, https://doi.org/10.5194/acp-23-4881-2023, 2023
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Smectites are a major class of clay minerals that are ice nucleation (IN) active. They form platelets that swell or even delaminate in water by intercalation of water between their layers. We hypothesize that at least three smectite layers need to be stacked together to host a critical ice embryo on clay mineral edges and that the larger the surface edge area is, the higher the freezing temperature. Edge sites on such clay particles play a crucial role in imparting IN ability to such particles.
Chun-Ning Mao, Kanishk Gohil, and Akua A. Asa-Awuku
Atmos. Chem. Phys., 22, 13219–13228, https://doi.org/10.5194/acp-22-13219-2022, https://doi.org/10.5194/acp-22-13219-2022, 2022
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The impact of molecular-level surface chemistry for aerosol water uptake and droplet growth is not well understood. In this work we show changes in water uptake due to molecular-level surface chemistry can be measured and quantified. In addition, we develop a single-parameter model, representing changes in aerosol chemistry that can be used in global climate models to reduce the uncertainty in aerosol-cloud predictions.
Diana L. Pereira, Irma Gavilán, Consuelo Letechipía, Graciela B. Raga, Teresa Pi Puig, Violeta Mugica-Álvarez, Harry Alvarez-Ospina, Irma Rosas, Leticia Martinez, Eva Salinas, Erika T. Quintana, Daniel Rosas, and Luis A. Ladino
Atmos. Chem. Phys., 22, 6435–6447, https://doi.org/10.5194/acp-22-6435-2022, https://doi.org/10.5194/acp-22-6435-2022, 2022
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Airborne particles were i) collected in an agricultural fields and ii) generated in the laboratory from agricultural soil samples to analyze their ice nucleating abilities. It was found that the size and chemical composition of the Mexican agricultural dust particles influence their ice nucleating behavior, where the organic components are likely responsible for their efficiency as INPs. The INP concentrations from the present study are comparable to those from higher latitudes.
Kristian Klumpp, Claudia Marcolli, and Thomas Peter
Atmos. Chem. Phys., 22, 3655–3673, https://doi.org/10.5194/acp-22-3655-2022, https://doi.org/10.5194/acp-22-3655-2022, 2022
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Surface interactions with solutes can significantly alter the ice nucleation activity of mineral dust. Past studies revealed the sensitivity of microcline, one of the most ice-active types of dust in the atmosphere, to inorganic solutes. This study focuses on the interaction of microcline with bio-organic substances and the resulting effects on its ice nucleation activity. We observe strongly hampered ice nucleation activity due to the presence of carboxylic and amino acids but not for polyols.
Rachel L. James, Vaughan T. J. Phillips, and Paul J. Connolly
Atmos. Chem. Phys., 21, 18519–18530, https://doi.org/10.5194/acp-21-18519-2021, https://doi.org/10.5194/acp-21-18519-2021, 2021
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Secondary ice production (SIP) plays an important role in ice formation within mixed-phase clouds. We present a laboratory investigation of a potentially new SIP mechanism involving the collisions of supercooled water drops with ice particles. At impact, the supercooled water drop fragments form smaller secondary drops. Approximately 30 % of the secondary drops formed during the retraction phase of the supercooled water drop impact freeze over a temperature range of −4 °C to −12 °C.
Julia Schneider, Kristina Höhler, Robert Wagner, Harald Saathoff, Martin Schnaiter, Tobias Schorr, Isabelle Steinke, Stefan Benz, Manuel Baumgartner, Christian Rolf, Martina Krämer, Thomas Leisner, and Ottmar Möhler
Atmos. Chem. Phys., 21, 14403–14425, https://doi.org/10.5194/acp-21-14403-2021, https://doi.org/10.5194/acp-21-14403-2021, 2021
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Homogeneous freezing is a relevant mechanism for the formation of cirrus clouds in the upper troposphere. Based on an extensive set of homogeneous freezing experiments at the AIDA chamber with aqueous sulfuric acid aerosol, we provide a new fit line for homogeneous freezing onset conditions of sulfuric acid aerosol focusing on cirrus temperatures. In the atmosphere, homogeneous freezing thresholds have important implications on the cirrus cloud occurrence and related cloud radiative effects.
Naruki Hiranuma, Brent W. Auvermann, Franco Belosi, Jack Bush, Kimberly M. Cory, Dimitrios G. Georgakopoulos, Kristina Höhler, Yidi Hou, Larissa Lacher, Harald Saathoff, Gianni Santachiara, Xiaoli Shen, Isabelle Steinke, Romy Ullrich, Nsikanabasi S. Umo, Hemanth S. K. Vepuri, Franziska Vogel, and Ottmar Möhler
Atmos. Chem. Phys., 21, 14215–14234, https://doi.org/10.5194/acp-21-14215-2021, https://doi.org/10.5194/acp-21-14215-2021, 2021
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We present laboratory and field studies showing that an open-lot livestock facility is a substantial source of atmospheric ice-nucleating particles (INPs). The ambient concentration of INPs from livestock facilities in Texas is very high. It is up to several thousand INPs per liter below –20 °C and may impact regional aerosol–cloud interactions. About 50% of feedlot INPs were supermicron in diameter. No notable amount of known ice-nucleating microorganisms was found in our feedlot samples.
Vaughan T. J. Phillips, Jun-Ichi Yano, Akash Deshmukh, and Deepak Waman
Atmos. Chem. Phys., 21, 11941–11953, https://doi.org/10.5194/acp-21-11941-2021, https://doi.org/10.5194/acp-21-11941-2021, 2021
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For decades, high concentrations of ice observed in precipitating mixed-phase clouds have created an enigma. Such concentrations are higher than can be explained by the action of aerosols or by the spontaneous freezing of most cloud droplets. The controversy has partly persisted due to the lack of laboratory experimentation in ice microphysics, especially regarding fragmentation of ice, a topic reviewed by a recent paper. Our comment attempts to clarify some issues with regards to that review.
Alexei A. Kiselev, Alice Keinert, Tilia Gaedeke, Thomas Leisner, Christoph Sutter, Elena Petrishcheva, and Rainer Abart
Atmos. Chem. Phys., 21, 11801–11814, https://doi.org/10.5194/acp-21-11801-2021, https://doi.org/10.5194/acp-21-11801-2021, 2021
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Alkali feldspar is the most abundant mineral in the Earth's crust and is often present in mineral dust aerosols that are responsible for the formation of rain and snow in clouds. However, the cloud droplets containing pure potassium-rich feldspar would not freeze unless cooled down to a very low temperature. Here we show that partly replacing potassium with sodium would induce fracturing of feldspar, exposing a crystalline surface that could initiate freezing at higher temperature.
Barbara Bertozzi, Robert Wagner, Junwei Song, Kristina Höhler, Joschka Pfeifer, Harald Saathoff, Thomas Leisner, and Ottmar Möhler
Atmos. Chem. Phys., 21, 10779–10798, https://doi.org/10.5194/acp-21-10779-2021, https://doi.org/10.5194/acp-21-10779-2021, 2021
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Internally mixed particles composed of sulfate and organics are among the most abundant aerosol types. Their ice nucleation (IN) ability influences the formation of cirrus and, thus, the climate. We show that the presence of a thin organic coating suppresses the heterogeneous IN ability of crystalline ammonium sulfate particles. However, the IN ability of the same particle can substantially change if subjected to atmospheric processing, mainly due to differences in the resulting morphology.
Hemanth S. K. Vepuri, Cheyanne A. Rodriguez, Dimitrios G. Georgakopoulos, Dustin Hume, James Webb, Gregory D. Mayer, and Naruki Hiranuma
Atmos. Chem. Phys., 21, 4503–4520, https://doi.org/10.5194/acp-21-4503-2021, https://doi.org/10.5194/acp-21-4503-2021, 2021
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Due to a high frequency of storm events, West Texas is an ideal location to study ice-nucleating particles (INPs) in severe precipitation. Our results present that cumulative INP concentration in our precipitation samples below −20 °C could be high in the samples collected while observing > 10 mm h−1 precipitation with notably large hydrometeor sizes and an implication of cattle feedyard bacteria inclusion. Marine bacteria were found in a subset of our precipitation and cattle feedyard samples.
Miklós Szakáll, Michael Debertshäuser, Christian Philipp Lackner, Amelie Mayer, Oliver Eppers, Karoline Diehl, Alexander Theis, Subir Kumar Mitra, and Stephan Borrmann
Atmos. Chem. Phys., 21, 3289–3316, https://doi.org/10.5194/acp-21-3289-2021, https://doi.org/10.5194/acp-21-3289-2021, 2021
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The freezing of cloud drops is promoted by ice-nucleating particles immersed in the drops. This process is essential to understand ice and subsequent precipitation formation in clouds. We investigated the efficiency of several particle types to trigger immersion freezing with two single-drop levitation techniques: a wind tunnel and an acoustic levitator. The evaluation accounted for different conditions during our two series of experiments, which is also applicable to future comparison studies.
Gabor Vali
Atmos. Chem. Phys., 21, 2551–2568, https://doi.org/10.5194/acp-21-2551-2021, https://doi.org/10.5194/acp-21-2551-2021, 2021
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The freezing of water drops in clouds is a prime example for the role of ice-nucleating particles (INPs). Mercuric iodide particles and a few other substances can be conditioned to become very effective INPs after previous ice formation and moderate heating to melt temperatures, opening a new pathway to ice formation in the atmosphere and in other systems like tissue preservation, artificial snow making, and more.
Maximilian Weitzel, Subir K. Mitra, Miklós Szakáll, Jacob P. Fugal, and Stephan Borrmann
Atmos. Chem. Phys., 20, 14889–14901, https://doi.org/10.5194/acp-20-14889-2020, https://doi.org/10.5194/acp-20-14889-2020, 2020
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The properties of ice crystals smaller than 150 µm in diameter were investigated in a cold-room laboratory using digital holography and microscopy. Automated image processing has been used to determine the track of falling ice crystals, and collected crystals were melted and scanned under a microscope to infer particle mass. A parameterization relating particle size and mass was determined which describes ice crystals in this size range more accurately than existing relationships.
Alexei Korolev and Thomas Leisner
Atmos. Chem. Phys., 20, 11767–11797, https://doi.org/10.5194/acp-20-11767-2020, https://doi.org/10.5194/acp-20-11767-2020, 2020
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Secondary ice production (SIP) plays a key role in the formation of ice particles in tropospheric clouds. This work presents a critical review of the laboratory studies related to secondary ice production. It aims to identify gaps in our knowledge of SIP as well as to stimulate further laboratory studies focused on obtaining a quantitative description of efficiencies for each SIP mechanism.
Robert O. David, Jonas Fahrni, Claudia Marcolli, Fabian Mahrt, Dominik Brühwiler, and Zamin A. Kanji
Atmos. Chem. Phys., 20, 9419–9440, https://doi.org/10.5194/acp-20-9419-2020, https://doi.org/10.5194/acp-20-9419-2020, 2020
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Ice crystal formation plays an important role in controlling the Earth's climate. However, the mechanisms responsible for ice formation in the atmosphere are still uncertain. Here we use surrogates for atmospherically relevant porous particles to determine the role of pore diameter and wettability on the ability of porous particles to nucleate ice in the atmosphere. Our results are consistent with the pore condensation and freeing mechanism.
Steven K. Krueger
Atmos. Chem. Phys., 20, 7895–7909, https://doi.org/10.5194/acp-20-7895-2020, https://doi.org/10.5194/acp-20-7895-2020, 2020
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When CCN are injected into a turbulent cloud chamber at a constant rate, and the rate of droplet activation is balanced by the rate of droplet fallout, a steady-state droplet size distribution (DSD) can be achieved. Analytic DSDs and PDFs of droplet radius were derived for such conditions when there is uniform supersaturation. Given the chamber height, the analytic PDF is determined by the supersaturation alone. This could allow one to infer the supersaturation that produced a measured PDF.
María Cascajo-Castresana, Robert O. David, Maiara A. Iriarte-Alonso, Alexander M. Bittner, and Claudia Marcolli
Atmos. Chem. Phys., 20, 3291–3315, https://doi.org/10.5194/acp-20-3291-2020, https://doi.org/10.5194/acp-20-3291-2020, 2020
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Atmospheric ice-nucleating particles are rare but relevant for cloud glaciation. A source of particles that nucleate ice above −15 °C is biological material including some proteins. Here we show that proteins of very diverse functions and structures can nucleate ice. Among these, the iron storage protein apoferritin stands out, with activity up to −4 °C. We show that its activity does not stem from correctly assembled proteins but from misfolded protein monomers or oligomers and aggregates.
Benjamin W. Clouser, Kara D. Lamb, Laszlo C. Sarkozy, Jan Habig, Volker Ebert, Harald Saathoff, Ottmar Möhler, and Elisabeth J. Moyer
Atmos. Chem. Phys., 20, 1089–1103, https://doi.org/10.5194/acp-20-1089-2020, https://doi.org/10.5194/acp-20-1089-2020, 2020
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Previous measurements of water vapor in the upper troposphere and lower stratosphere (UT/LS) have shown unexpectedly high concentrations of water vapor in ice clouds, which may be due to an incomplete understanding of the structure of ice and the behavior of ice growth in this part of the atmosphere. Water vapor measurements during the 2013 IsoCloud campaign at the AIDA cloud chamber show no evidence of this
anomalous supersaturationin conditions similar to the real atmosphere.
Jon Nelson and Brian D. Swanson
Atmos. Chem. Phys., 19, 15285–15320, https://doi.org/10.5194/acp-19-15285-2019, https://doi.org/10.5194/acp-19-15285-2019, 2019
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Ice crystals in clouds have a wide variety. But many crystal forms are inexplicable using the common approach of modeling the growth rates normal to the crystal faces. Instead of using only this normal-growth approach, we suggest including lateral facet growth processes. Using such lateral processes, backed up by new experiments, we give explanations for some of these puzzling forms. The forms include the center droxtal in stellar crystals, scrolls, capped columns, sheath bundles, and trigonals.
Alexander D. Harrison, Katherine Lever, Alberto Sanchez-Marroquin, Mark A. Holden, Thomas F. Whale, Mark D. Tarn, James B. McQuaid, and Benjamin J. Murray
Atmos. Chem. Phys., 19, 11343–11361, https://doi.org/10.5194/acp-19-11343-2019, https://doi.org/10.5194/acp-19-11343-2019, 2019
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Mineral dusts are a source of ice-nucleating particles (INPs) in the atmosphere. Here we present a comprehensive survey of the ice-nucleating ability of naturally occurring quartz. We show the ice-nucleating variability of quartz and its sensitivity to time spent in water and air. We propose four new parameterizations for the minerals quartz, K feldspar, albite and plagioclase to predict INP concentrations in the atmosphere and show that K-feldspar is the dominant INP type in mineral dusts.
André Welti, Ulrike Lohmann, and Zamin A. Kanji
Atmos. Chem. Phys., 19, 10901–10918, https://doi.org/10.5194/acp-19-10901-2019, https://doi.org/10.5194/acp-19-10901-2019, 2019
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The ice nucleation ability of singly immersed feldspar particles in suspended water droplets relevant for ice crystal formation under mixed-phase cloud conditions is presented. The effects of particle size, crystal structure, trace metal and mineralogical composition are discussed by testing up to five different diameters in the submicron range and nine different feldspar samples at conditions relevant for ice nucleation in mixed-phase clouds.
Nsikanabasi Silas Umo, Robert Wagner, Romy Ullrich, Alexei Kiselev, Harald Saathoff, Peter G. Weidler, Daniel J. Cziczo, Thomas Leisner, and Ottmar Möhler
Atmos. Chem. Phys., 19, 8783–8800, https://doi.org/10.5194/acp-19-8783-2019, https://doi.org/10.5194/acp-19-8783-2019, 2019
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Annually, over 600 Tg of coal fly ash (CFA) is produced; a significant proportion of this amount is injected into the atmosphere, which could significantly contribute to heterogeneous ice formation in clouds. This study presents an improved understanding of CFA particles' behaviour in forming ice in clouds, especially when exposed to lower temperatures before being re-circulated in the upper troposphere or entrained into the lower troposphere.
Naruki Hiranuma, Kouji Adachi, David M. Bell, Franco Belosi, Hassan Beydoun, Bhaskar Bhaduri, Heinz Bingemer, Carsten Budke, Hans-Christian Clemen, Franz Conen, Kimberly M. Cory, Joachim Curtius, Paul J. DeMott, Oliver Eppers, Sarah Grawe, Susan Hartmann, Nadine Hoffmann, Kristina Höhler, Evelyn Jantsch, Alexei Kiselev, Thomas Koop, Gourihar Kulkarni, Amelie Mayer, Masataka Murakami, Benjamin J. Murray, Alessia Nicosia, Markus D. Petters, Matteo Piazza, Michael Polen, Naama Reicher, Yinon Rudich, Atsushi Saito, Gianni Santachiara, Thea Schiebel, Gregg P. Schill, Johannes Schneider, Lior Segev, Emiliano Stopelli, Ryan C. Sullivan, Kaitlyn Suski, Miklós Szakáll, Takuya Tajiri, Hans Taylor, Yutaka Tobo, Romy Ullrich, Daniel Weber, Heike Wex, Thomas F. Whale, Craig L. Whiteside, Katsuya Yamashita, Alla Zelenyuk, and Ottmar Möhler
Atmos. Chem. Phys., 19, 4823–4849, https://doi.org/10.5194/acp-19-4823-2019, https://doi.org/10.5194/acp-19-4823-2019, 2019
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A total of 20 ice nucleation measurement techniques contributed to investigate the immersion freezing behavior of cellulose particles – natural polymers. Our data showed several types of cellulose are able to nucleate ice as efficiently as some mineral dust samples and cellulose has the potential to be an important atmospheric ice-nucleating particle. Continued investigation/collaboration is necessary to obtain further insight into consistency or diversity of ice nucleation measurements.
Kaitlyn J. Suski, David M. Bell, Naruki Hiranuma, Ottmar Möhler, Dan Imre, and Alla Zelenyuk
Atmos. Chem. Phys., 18, 17497–17513, https://doi.org/10.5194/acp-18-17497-2018, https://doi.org/10.5194/acp-18-17497-2018, 2018
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This work investigates the cloud condensation nuclei and ice nucleation activity of bacteria using cloud chamber data and a single particle mass spectrometer. The size and chemical composition of the cloud residuals show that bacterial fragments mixed with agar growth media activate preferentially over intact bacteria cells as cloud condensation nuclei. Intact bacteria cells do not make it into cloud droplets; they thus cannot serve as immersion-mode ice nucleating particles.
Jiahui Zhang, Dao-Yi Gong, Rui Mao, Jing Yang, Ziyin Zhang, and Yun Qian
Atmos. Chem. Phys., 18, 16775–16791, https://doi.org/10.5194/acp-18-16775-2018, https://doi.org/10.5194/acp-18-16775-2018, 2018
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The Chinese Spring Festival (also known as the Chinese New Year or Lunar New Year) is the most important festival in China. This paper reports that during the Chinese Spring Festival, the precipitation over southern China has been significantly reduced. The precipitation reduction is due to anomalous northerly winds. We suppose that anomalous atmospheric circulation is likely related to the human activity during holidays. It is an interesting phenomenon.
Sarah Grawe, Stefanie Augustin-Bauditz, Hans-Christian Clemen, Martin Ebert, Stine Eriksen Hammer, Jasmin Lubitz, Naama Reicher, Yinon Rudich, Johannes Schneider, Robert Staacke, Frank Stratmann, André Welti, and Heike Wex
Atmos. Chem. Phys., 18, 13903–13923, https://doi.org/10.5194/acp-18-13903-2018, https://doi.org/10.5194/acp-18-13903-2018, 2018
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In this study, coal fly ash particles immersed in supercooled cloud droplets were analyzed concerning their freezing behavior. Additionally, physico-chemical particle properties (morphology, chemical composition, crystallography) were investigated. In combining both aspects, components that potentially contribute to the observed freezing behavior of the ash could be identified. Interactions at the particle-water interface, that depend on suspension time and influence freezing, are discussed.
Fabian Mahrt, Claudia Marcolli, Robert O. David, Philippe Grönquist, Eszter J. Barthazy Meier, Ulrike Lohmann, and Zamin A. Kanji
Atmos. Chem. Phys., 18, 13363–13392, https://doi.org/10.5194/acp-18-13363-2018, https://doi.org/10.5194/acp-18-13363-2018, 2018
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The ice nucleation ability of different soot particles in the cirrus and mixed-phase cloud temperature regime is presented. The impact of aerosol particle size, particle morphology, organic matter and hydrophilicity on ice nucleation is examined. We propose ice nucleation proceeds via a pore condensation freezing mechanism for soot particles with the necessary physicochemical properties that nucleated ice well below water saturation.
Wiebke Frey, Dawei Hu, James Dorsey, M. Rami Alfarra, Aki Pajunoja, Annele Virtanen, Paul Connolly, and Gordon McFiggans
Atmos. Chem. Phys., 18, 9393–9409, https://doi.org/10.5194/acp-18-9393-2018, https://doi.org/10.5194/acp-18-9393-2018, 2018
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The coupled system of the Manchester Aerosol Chamber and Manchester Ice Cloud Chamber was used to study the ice-forming abilities of secondary
organic aerosol particles under mixed-phase cloud conditions. Given the vast abundance of secondary organic particles in the atmosphere, they
might present an important contribution to ice-nucleating particles. However, we find that in the studied temperature range (20 to 28 °C)
the secondary organic particles do not nucleate ice particles.
Sarvesh Garimella, Daniel A. Rothenberg, Martin J. Wolf, Robert O. David, Zamin A. Kanji, Chien Wang, Michael Rösch, and Daniel J. Cziczo
Atmos. Chem. Phys., 17, 10855–10864, https://doi.org/10.5194/acp-17-10855-2017, https://doi.org/10.5194/acp-17-10855-2017, 2017
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This study investigates systematic and variable low bias in the measurement of ice nucleating particle concentration using continuous flow diffusion chambers. We find that non-ideal instrument behavior exposes particles to different humidities and/or temperatures than predicted from theory. We use a machine learning approach to quantify and minimize the uncertainty associated with this measurement bias.
Pascal Lemaitre, Arnaud Querel, Marie Monier, Thibault Menard, Emmanuel Porcheron, and Andrea I. Flossmann
Atmos. Chem. Phys., 17, 4159–4176, https://doi.org/10.5194/acp-17-4159-2017, https://doi.org/10.5194/acp-17-4159-2017, 2017
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We present new measurements of the efficiency with which aerosol particles are collected by raindrops. These measurements provide the link to reconcile the scavenging coefficients obtained from theoretical approaches with those from experimental studies. We provide proof of the rear capture that is a fundamental effect on submicroscopic particles. Finally, we propose an expression to take into account this mechanism to calculate the collection efficiency for drops within the rain size range.
Lukas Kaufmann, Claudia Marcolli, Beiping Luo, and Thomas Peter
Atmos. Chem. Phys., 17, 3525–3552, https://doi.org/10.5194/acp-17-3525-2017, https://doi.org/10.5194/acp-17-3525-2017, 2017
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To improve the understanding of heterogeneous ice nucleation, we have subjected different ice nuclei to repeated freezing cycles and evaluated the freezing temperatures with different parameterizations of classical nucleation theory. It was found that two fit parameters were necessary to describe the temperature dependence of the nucleation rate.
Claudia Marcolli
Atmos. Chem. Phys., 17, 1595–1622, https://doi.org/10.5194/acp-17-1595-2017, https://doi.org/10.5194/acp-17-1595-2017, 2017
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Laboratory studies from the last century have shown that some types of particles are susceptible to pre-activation, i.e. they are able to develop macroscopic ice at warmer temperatures or lower relative humidities after they had been involved in an ice nucleation event before. This review analyses these works under the presumption that pre-activation occurs by ice preserved in pores, and it discusses atmospheric scenarios for which pre-activation might be important.
Yvonne Boose, André Welti, James Atkinson, Fabiola Ramelli, Anja Danielczok, Heinz G. Bingemer, Michael Plötze, Berko Sierau, Zamin A. Kanji, and Ulrike Lohmann
Atmos. Chem. Phys., 16, 15075–15095, https://doi.org/10.5194/acp-16-15075-2016, https://doi.org/10.5194/acp-16-15075-2016, 2016
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We compare the immersion freezing behavior of four airborne to 11 surface-collected dust samples to investigate the role of different minerals for atmospheric ice nucleation on desert dust. We find that present K-feldspars dominate at T > 253 K, while quartz does at colder temperatures, and surface-collected dust samples are not necessarily representative for airborne dust. For improved ice cloud prediction, modeling of quartz and feldspar emission and transport are key.
Andreas Peckhaus, Alexei Kiselev, Thibault Hiron, Martin Ebert, and Thomas Leisner
Atmos. Chem. Phys., 16, 11477–11496, https://doi.org/10.5194/acp-16-11477-2016, https://doi.org/10.5194/acp-16-11477-2016, 2016
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The precipitation in midlatitude clouds proceeds predominantly via nucleation of ice in the supercooled droplets containing foreign inclusions, like feldspar mineral dust, that have been recently identified as one of the most active ice nucleating agents in the atmosphere. We have built an apparatus to observe the freezing of feldspar immersed in up to 1500 identical droplets simultaneously. With this setup we investigated four feldspar samples and show that it can induce freezing at −5 °C.
Claudia Marcolli, Baban Nagare, André Welti, and Ulrike Lohmann
Atmos. Chem. Phys., 16, 8915–8937, https://doi.org/10.5194/acp-16-8915-2016, https://doi.org/10.5194/acp-16-8915-2016, 2016
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Silver iodide is one of the best-investigated ice nuclei. It has relevance for the atmosphere since it is used for glaciogenic cloud seeding. Nevertheless, many open questions remain. This paper gives an overview of silver iodide as an ice nucleus and tries to identify the factors that influence the ice nucleation ability of silver iodide.
Daniel O'Sullivan, Benjamin J. Murray, James F. Ross, and Michael E. Webb
Atmos. Chem. Phys., 16, 7879–7887, https://doi.org/10.5194/acp-16-7879-2016, https://doi.org/10.5194/acp-16-7879-2016, 2016
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In the absence of particles which can trigger freezing, cloud droplets can exist in a supercooled liquid state well below the melting point. However, the sources of efficient ice-nucleating particles in the atmosphere are uncertain. Here we show that ice-nucleating proteins produced by soil fungi can bind to clay particles in soils. Hence, the subsequent dispersion of soil particles into the atmosphere acts as a route through which biological ice nucleators can influence clouds.
Kuan-Ting O and Robert Wood
Atmos. Chem. Phys., 16, 7239–7249, https://doi.org/10.5194/acp-16-7239-2016, https://doi.org/10.5194/acp-16-7239-2016, 2016
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In this work, based on the well-known formulae of classical nucleation theory (CNT), the temperature at which the mean number of critical embryos inside a droplet is unity is derived from the Boltzmann distribution function and explored as a new simplified approximation for homogeneous freezing temperature. It thus appears that the simplicity of this approximation makes it potentially useful for predicting homogeneous freezing temperatures of water droplets in the atmosphere.
Martin Schnaiter, Emma Järvinen, Paul Vochezer, Ahmed Abdelmonem, Robert Wagner, Olivier Jourdan, Guillaume Mioche, Valery N. Shcherbakov, Carl G. Schmitt, Ugo Tricoli, Zbigniew Ulanowski, and Andrew J. Heymsfield
Atmos. Chem. Phys., 16, 5091–5110, https://doi.org/10.5194/acp-16-5091-2016, https://doi.org/10.5194/acp-16-5091-2016, 2016
Leonid Nichman, Claudia Fuchs, Emma Järvinen, Karoliina Ignatius, Niko Florian Höppel, Antonio Dias, Martin Heinritzi, Mario Simon, Jasmin Tröstl, Andrea Christine Wagner, Robert Wagner, Christina Williamson, Chao Yan, Paul James Connolly, James Robert Dorsey, Jonathan Duplissy, Sebastian Ehrhart, Carla Frege, Hamish Gordon, Christopher Robert Hoyle, Thomas Bjerring Kristensen, Gerhard Steiner, Neil McPherson Donahue, Richard Flagan, Martin William Gallagher, Jasper Kirkby, Ottmar Möhler, Harald Saathoff, Martin Schnaiter, Frank Stratmann, and António Tomé
Atmos. Chem. Phys., 16, 3651–3664, https://doi.org/10.5194/acp-16-3651-2016, https://doi.org/10.5194/acp-16-3651-2016, 2016
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Processes in the atmosphere are often governed by the physical and chemical properties of small cloud particles. Ice, water, and mixed clouds, as well as viscous aerosols, were formed under controlled conditions at the CLOUD-CERN facility. The experimental results show a link between cloud particle properties and their unique optical fingerprints. The classification map presented here allows easier discrimination between various particles such as viscous organic aerosol, salt, ice, and liquid.
Peter A. Alpert and Daniel A. Knopf
Atmos. Chem. Phys., 16, 2083–2107, https://doi.org/10.5194/acp-16-2083-2016, https://doi.org/10.5194/acp-16-2083-2016, 2016
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A stochastic immersion freezing model is introduced capable of reproducing laboratory data for a variety of experimental methods using a time and surface area dependent ice nucleation process. The assumption that droplets contain identical surface area is evaluated. A quantitative uncertainty analysis of the laboratory observed freezing process is presented. Our results imply that ice nuclei surface area assumptions are crucial for interpretation of experimental immersion freezing results.
Robert Wagner, Alexei Kiselev, Ottmar Möhler, Harald Saathoff, and Isabelle Steinke
Atmos. Chem. Phys., 16, 2025–2042, https://doi.org/10.5194/acp-16-2025-2016, https://doi.org/10.5194/acp-16-2025-2016, 2016
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We have investigated the enhancement of the ice nucleation ability of well-known and abundant ice nucleating particles like dust grains due to pre-activation. Temporary exposure to a low temperature (228 K) provokes that pores and surface cracks of the particles are filled with ice, which makes them better nuclei for the growth of macroscopic ice crystals at high temperatures (245–260 K).
M. L. López and E. E. Ávila
Atmos. Chem. Phys., 16, 927–932, https://doi.org/10.5194/acp-16-927-2016, https://doi.org/10.5194/acp-16-927-2016, 2016
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This work deals with the origin and nature of atmospheric ice-nucleating particles (INPs). An accurate determination of the atmospheric INP concentration is relevant since INPs induce freezing in clouds, thus initiating an efficient mechanism for cloud particles to reach a precipitating size.
The effect of relative humidity on the INP concentration at ground level was analyzed and discussed.
B. Nagare, C. Marcolli, O. Stetzer, and U. Lohmann
Atmos. Chem. Phys., 15, 13759–13776, https://doi.org/10.5194/acp-15-13759-2015, https://doi.org/10.5194/acp-15-13759-2015, 2015
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We determined collision efficiencies of cloud droplets with aerosol particles experimentally and found that they were around 1 order of magnitude higher than theoretical formulations that include Brownian diffusion, impaction, interception, thermophoretic, diffusiophoretic and electric forces. This is most probably due to uncertainties and inaccuracies in the theoretical formulations of thermophoretic and diffusiophoretic processes.
Cited articles
Auriol, F., Gayet, J.-F., Febvre, G., Jourdan, O., Labonnote, L., and Brogniez,
G.: In situ observations of cirrus cloud scattering phase function with
22∘ and 46∘ halos: Cloud field study on 19 February 1998, J.
Atmos. Sci., 58, 3376–3390,
https://doi.org/10.1175/1520-0469(2001)058<3376:ISOOCS>2.0.CO;2, 2001. a
Bacon, N. J., Baker, M. B., and Swanson, B. D.: Initial stages in the
morphological evolution of vapour-grown ice crystals: A laboratory
investigation, Q. J. Roy. Meteor. Soc., 129, 1903–1927,
https://doi.org/10.1256/qj.02.04, 2003. a, b, c
Bailey, M. and Hallett, J.: Growth rates and habits of ice crystals between
−20 ∘ and −70 ∘C, J. Atmos. Sci., 61, 514–544,
https://doi.org/10.1175/1520-0469(2004)061<0514:GRAHOI>2.0.CO;2, 2004. a, b
Baran, A. J.: From the single-scattering properties of ice crystals to climate
prediction: A way forward, Atmos. Res., 112, 45–69,
https://doi.org/10.1016/j.atmosres.2012.04.010, 2012. a
Baumgardner, D., Abel, S. J., Axisa, D., Cotton, R., Crosier, J., Field, P.,
Gurganus, C., Heymsfield, A., Korolev, A., Kraemer, M., Lawson, P.,
McFarquhar, G., Ulanowski, Z., and Um, J.: Cloud ice properties: in situ
measurement challenges, Meteor. Monographs, 58, 9.1–9.23,
https://doi.org/10.1175/AMSMONOGRAPHS-D-16-0011.1, 2017. a
Beckmann, W.: Interface kinectics of the growth and evaporation of ice single
crystals from the vapour phase: III. Measurements under partial pressures of
nitrogen, J. Cryst. Growth, 58, 443–451,
https://doi.org/10.1016/0022-0248(82)90291-3, 1982. a, b, c, d
Boucher, O., Randall, D., Artaxo, P., Bretherton, C., Feingold, G., Forster,
P., Kerminen, V.-M., Kondo, Y., Liao, H., Lohmann, U., Rasch, P., Satheesh, S. K., Sherwood, S., Stevens, B., and Zhang, X. Y.: Clouds and
aerosols, in: Climate change 2013: the physical science basis. Contribution
of Working Group I to the Fifth Assessment Report of the Intergovernmental
Panel on Climate Change, 571–657, Cambridge University Press, Cambridge, UK,
https://doi.org/10.1017/CBO9781107415324.016, 2013. a
Caranti, J. M. and Illingworth, A. J.: The contact potential of rimed ice, J.
Phys. Chem., 87, 4125–4130, https://doi.org/10.1021/j100244a028, 1983. a
Chou, C., Voigtländer, J., and Ulanowski, Z.: Evolution of 2-D light scattering patterns during cyclic ice growth experiment in Fig.
9, https://doi.org/10.5446/35425, 2018a.
Chou, C., Voigtländer, J., and Ulanowski, Z.: Evolution of 2-D light scattering patterns during cyclic ice growth experiment in Fig.
10, https://doi.org/10.5446/35426, 2018b.
Clarke, A. J. M., Hesse, E., Ulanowski, Z., and Kaye, P. H.: A 3D
implementation of ray tracing combined with diffraction on facets:
Verification and a potential application, J. Quant. Spectrosc. Ra.,
100, 103–114, https://doi.org/10.1016/j.jqsrt.2005.11.028, 2006. a
Cleveland, W. S. and Devlin, S. J.: Locally weighted regression: an approach to
regression analysis by local fitting, J. Am. Stat. Assoc., 83, 596–610,
https://doi.org/10.1080/01621459.1988.10478639, 1988. a
Connolly, P. J., Flynn, M. J., Ulanowski, Z., Choularton, T. W., Gallagher,
M. W., and Bower, K. N.: Calibration of 2-D imaging probes using calibration
beads and ice crystal analogues, J. Atmos. Ocean. Tech., 24, 1860–1879,
https://doi.org/10.1175/JTECH2096.1, 2007. a
Cotton, R., Osborne, S., Ulanowski, Z., Hirst, E., Kaye, P. H., and Greenaway,
R.: The ability of the Small Ice Detector (SID-2) to characterize cloud
particle and aerosol morphologies obtained during flights of the FAAM BAe-146
research aircraft, J. Atmos. Ocean. Tech., 27, 290–303,
https://doi.org/10.1175/2009JTECHA1282.1, 2010. a
Cross, J. D.: Scanning electron microscopy of evaporating ice, Science, 164,
174–175, https://doi.org/10.1126/science.164.3876.174, 1969. a, b
Dash, J. G. and Wettlaufer, J. S.: The surface physics of ice in thunderstorms,
Can. J. Phys., 81, 201–207, https://doi.org/10.1139/p03-011, 2003. a, b, c
Dash, J. G., Mason, B. L., and Wettlaufer, J. S.: Theory of charge and mass
transfer in ice-ice collisions, J. Geophys. Res., 106, 20395–20402,
https://doi.org/10.1029/2001JD900109, 2001. a, b
Dash, J. G., Rempel, A. W., and Wettlaufer, J. S.: The physics of premelted
ice and its geophysical consequences, Rev. Mod. Phys., 78, 695–741, https://doi.org/10.1103/RevModPhys.78.695, 2006. a, b
Dymarska, M., Murray, B. J., Sun, L., Eastwood, M. L., Knopf, D. A., and
Bertram, A. K.: Deposition ice nucleation on soot at temperatures relevant
for the lower troposphere, J. Geophys. Res., 111, D04204,
https://doi.org/10.1029/2005JD006627, 2006. a
Engel, I., Luo, B. P., Pitts, M. C., Poole, L. R., Hoyle, C. R., Grooß, J.-U.,
Dörnbrack, A., and Peter, T.: Heterogeneous formation of polar stratospheric
clouds – Part 2: Nucleation of ice on synoptic scales, Atmos. Chem. Phys., 13, 10769–10785, https://doi.org/10.5194/acp-13-10769-2013, 2013. a
Ferreira, A., Faria, N., and Rocha, F.: Roughness effect on the overall growth
rate of sucrose crystals, J. Cryst. Growth, 310, 442–451,
https://doi.org/10.1016/j.jcrysgro.2007.11.031, 2008. a, b, c
Field, P. R., Heymsfield, A. J., and Bansemer, A.: Shattering and particle
interarrival times measured by optical array probes in ice clouds, J. Atmos.
Ocean. Tech., 23, 1357–1371, https://doi.org/10.1175/JTECH1922.1, 2006. a
Flood, A. E.: Feedback between crystal growth rates and surface roughness,
Cryst. Eng. Comm., 12, 313–323, https://doi.org/10.1039/B914913A, 2010. a, b, c
Flossmann, A. I. and Wobrock, W.: A review of our understanding of the
aerosol–cloud interaction from the perspective of a bin resolved cloud scale
modelling, Atmos. Res., 97, 478–497,
https://doi.org/10.1016/j.atmosres.2010.05.008, 2010. a
Foot, J. S.: Some observations of the optical properties of clouds. II: Cirrus,
Q. J. Roy. Meteor. Soc., 114, 145–164,
https://doi.org/10.1002/qj.49711447908, 1988. a
Garrett, T. J., Hobbs, P. V., and Gerber, H.: Shortwave, single-scattering
properties of arctic ice clouds, J. Geophys. Res., 106, 15155–15172,
https://doi.org/10.1029/2000JD900195, 2001. a
Gierens, K., Schumann, U., Helten, M., Smit, H., and Marenco, A.: A distribution law
for relative humidity in the upper troposphere and lower stratosphere
derived from three years of MOZAIC measurements, Ann. Geophys., 17, 1218–1226, https://doi.org/10.1007/s00585-999-1218-7, 1999. a
Gierens, K., Schumann, U., Helten, M., Smit, H., and Wang, P.-H.:
Ice-supersaturated regions and subvisible cirrus in the northern midlatitude
upper troposphere, J. Geophys. Res., 105, 22743–22753,
https://doi.org/10.1029/2000JD900341, 2000. a
Gladich, I., Oswald, A., Bowens, N., Naatz, S., Rowe, P., Roeselova, M., and
Neshyba, S.: Mechanism of anisotropic surface self-diffusivity at the
prismatic ice–vapor interface, Phys. Chem. Chem. Phys., 17, 22947–22958,
https://doi.org/10.1039/c5cp01330e, 2015. a
Gonda, T.: The growth of small ice crystals in gases of high and low pressures,
J. Meteor. Soc. Japan, 54, 233–240,
https://doi.org/10.2151/jmsj1965.54.4_233, 1976. a
Gonda, T.: The growth of small ice crystals in gases of high and low pressures
at −30 and −44 ∘C, J. Meteor. Soc. Japan, 55, 142–146,
https://doi.org/10.2151/jmsj1965.55.1_142, 1977. a
Hallett, J.: Faceted snow crystals, J. Opt. Soc. Am., 4, 581–588,
https://doi.org/10.1364/JOSAA.4.000581, 1987. a
Hansen, T. C., Koza, M. M., and Kuhs, W. F.: Formation and annealing of cubic
ice: I. Modelling of stacking faults, J. Phys., 20, 285104,
https://doi.org/10.1088/0953-8984/20/28/285104, 2008. a
Haralick, R. M., Shanmugam, K., and Dinstein, I.: Textural features for image
classification, IEEE T. Syst. Man. Cyb., SMC-3, 610–621,
https://doi.org/10.1109/TSMC.1973.4309314, 1973. a
Hartmann, D. L., Ockert-Bell, M. E., and Michelsen, M. L.: The effect of cloud
type on Earth's energy balance: Global analysis, J. Climate, 5, 1281–1304,
https://doi.org/10.1175/1520-0442(1992)005<1281:TEOCTO>2.0.CO;2, 1992. a
Hartmann, S., Niedermeier, D., Voigtländer, J., Clauss, T., Shaw, R. A., Wex, H.,
Kiselev, A., and Stratmann, F.: Homogeneous and heterogeneous ice nucleation at LACIS:
operating principle and theoretical studies, Atmos. Chem. Phys., 11, 1753–1767, https://doi.org/10.5194/acp-11-1753-2011, 2011. a, b
Heymsfield, A. J., Krämer, M., Luebke, A., Brown, P., Cziczo, D. J.,
Franklin, C., Lawson, P., Lohmann, U., McFarquhar, G., Ulanowski, Z., and
VanTricht, K.: Cirrus clouds, Meteor. Monographs, 58, 2.1–2.26,
https://doi.org/10.1175/AMSMONOGRAPHS-D-16-0010.1, 2017. a
Hioki, S., Yang, P., Baum, B. A., Platnick, S., Meyer, K. G., King, M. D., and Riedi, J.:
Degree of ice particle surface roughness inferred from polarimetric
observations, Atmos. Chem. Phys., 16, 7545–7558, https://doi.org/10.5194/acp-16-7545-2016, 2016. a
Hoyle, C. R., Luo, B. P., and Peter, T.: The origin of high ice crystal number
densities in cirrus clouds, J. Atmos. Sci., 62, 2568–2579,
https://doi.org/10.1175/JAS3487.1, 2005. a
Hudait, A. and Molinero, V.: What determines the ice polymorph in clouds?, J.
Amer. Chem. Soc., 138, 8958–8967, https://doi.org/10.1021/jacs.6b05227,
2016. a
Jensen, E. J., Lawson, P., Baker, B., Pilson, B., Mo, Q., Heymsfield, A. J.,
Bansemer, A., Bui, T. P., McGill, M., Hlavka, D., Heymsfield, G., Platnick, S.,
Arnold, G. T., and Tanelli, S.: On the importance of small ice crystals in tropical
anvil cirrus, Atmos. Chem. Phys., 9, 5519–5537, https://doi.org/10.5194/acp-9-5519-2009, 2009. a
Jensen, E. J., Lawson, R. P., Bergman, J. W., Pfister, L., Bui, T. P., and
Schmitt, C. G.: Physical processes controlling ice concentrations in
synoptically forced, midlatitude cirrus, J. Geophys. Res., 118, 5348–5360,
https://doi.org/10.1002/jgrd.50421, 2013. a
Jolic, K. I., Nagarajah, C. R., and Thompson, W.: Non-contact, optically based
measurement of surface roughness of ceramics, Meas. Sci. Technol., 5,
671–684, https://doi.org/10.1088/0957-0233/5/6/007, 1994. a
Kaye, P. H., Hirst, E., Greenaway, R. S., Ulanowski, Z., Hesse, E., DeMott,
P. J., Saunders, C., and Connolly, P.: Classifying atmospheric ice crystals
by spatial light scattering, Opt. Lett., 33, 1545–1547,
https://doi.org/10.1364/OL.33.001545, 2008. a, b
Keller, V. W. and Hallett, J.: Influence of air velocity on the habit of ice
crystal growth from the vapor, J. Cryst. Growth, 60, 91–106,
https://doi.org/10.1016/0022-0248(82)90176-2, 1982. a
Korolev, A. V., Isaac, G. A., and Hallett, J.: Ice particle habits in Arctic
clouds, Geophys. Res. Lett., 26, 1299–1302,
https://doi.org/10.1029/1999GL900232, 1999. a, b, c, d
Korolev, A. V., Emery, E. F., Strapp, J. W., Cober, S. G., Isaac, G. A., Wasey,
M., and Marcotte, D.: Small ice particles in tropospheric clouds: Fact or
artifact? Airborne Icing Instrumentation Evaluation Experiment, B. Am.
Meteorol. Soc., 92, 967–973, https://doi.org/10.1175/2010BAMS3141.1, 2011. a
Krämer, M., Schiller, C., Afchine, A., Bauer, R., Gensch, I., Mangold, A.,
Schlicht, S., Spelten, N., Sitnikov, N., Borrmann, S., de Reus, M., and Spichtinger, P.:
Ice supersaturations and cirrus cloud crystal
numbers, Atmos. Chem. Phys., 9, 3505–3522, https://doi.org/10.5194/acp-9-3505-2009, 2009. a, b
Kübbeler, M., Hildebrandt, M., Meyer, J., Schiller, C., Hamburger, Th., Jurkat, T.,
Minikin, A., Petzold, A., Rautenhaus, M., Schlager, H., Schumann, U., Voigt, C.,
Spichtinger, P., Gayet, J.-F., Gourbeyre, C., and Krämer, M.: Thin and subvisible
cirrus and contrails in a subsaturated environment, Atmos. Chem. Phys., 11, 5853–5865, https://doi.org/10.5194/acp-11-5853-2011, 2011. a, b
Kuhs, W. F., Sippel, C., Falenty, A., and Hansen, T. C.: Extent and relevance
of stacking disorder in “ice Ic”, P. Natl. Acad. Sci. USA, 109,
21259–21264, https://doi.org/10.1073/pnas.1210331110, 2012. a, b, c
Kuroda, T. and Gonda, T.: Rate determining provesses of growth of ice crystals
from the vapour phase, Part II: investigations of surface kinetic processes,
J. Meteor. Soc. Jap., 62, 563–572,
https://doi.org/10.2151/jmsj1965.62.3_563, 1984. a
Libbrecht, K. G.: Physical dynamics of ice crystal growth, Annu. Rev. Mat.
Res., 47, 271–295, https://doi.org/10.1146/annurev-matsci-070616-124135,
2017. a
Liu, C., Panetta, R. L., and Yang, P.: The effects of surface roughness on the
scattering properties of hexagonal columns with sizes from the Rayleigh to
the geometric optics regimes, J. Quant. Spectrosc. Ra., 129,
169–185, https://doi.org/10.1016/j.jqsrt.2013.06.011, 2013. a
Lu, R.-S., Tian, G.-Y., Gledhill, D., and Ward, S.: Grinding surface roughness
measurement based on the co-occurrence matrix of speckle pattern texture,
Appl. Optics, 45, 8839–8847, https://doi.org/10.1364/AO.45.008839, 2006. a
Magee, N. B., Miller, A., Amaral, M., and Cumiskey, A.: Mesoscopic surface roughness of
ice crystals pervasive across a wide range of ice crystal
conditions, Atmos. Chem. Phys., 14, 12357–12371, https://doi.org/10.5194/acp-14-12357-2014, 2014. a
Malkin, T. L., Murray, B. J., Brukhno, A. V., Anwar, J., and Salzmann, C. G.:
Structure of ice crystallized from supercooled water, P. Natl. Acad. Sci. USA,
109, 1041–1045, https://doi.org/10.1073/pnas.1113059109, 2012. a
Malkin, T. L., Murray, B. J., Salzmann, C. G., Molinero, V., Pickering, S. J.,
and Whale, T. F.: Stacking disorder in ice I, Phys. Chem. Chem. Phys., 17,
60–76, https://doi.org/10.1039/C4CP02893G, 2015. a
Mason, B. J., Bryant G. W., and Van den Heuvel, A. P.: The growth habits and
surface structure of ice crystals, Philos. Mag. 8, 505–526,
https://doi.org/10.1080/14786436308211150, 1963. a, b
McFarquhar, G. M. and Heymsfield, A. J.: Parameterization of tropical cirrus
ice crystal size distributions and implications for radiative transfer:
Results from CEPEX, J. Atmos. Sci., 54, 2187–2200,
https://doi.org/10.1175/1520-0469(1997)054<2187:POTCIC>2.0.CO;2, 1997. a
McFarquhar, G. M., Heymsfield, A. J., Spinhirne, J., and Hart, B.: Thin and
subvisual tropopause tropical cirrus: Observations and radiative impacts, J.
Atmos. Sci., 57, 1841–1853,
https://doi.org/10.1175/1520-0469(2000)057<1841:TASTTC>2.0.CO;2, 2000. a
Michaelides, A., and Slater, B.: Melting the ice one layer at a time, P.
Natl. Acad. Sci. USA, 114, 195–197, https://doi.org/10.1073/pnas.1619259114,
2017. a
Misbah, C., Pierre-Louis, O., and Saito, Y.: Crystal surfaces in and out of
equilibrium: A modern view, Rev. Mod. Phys., 82, 981–1040,
https://doi.org/10.1103/RevModPhys.82.981, 2010. a
Murray, B. J., Salzmann, C. G., Heymsfield, A. J., Dobbie, S., Neely III,
R. R., and Cox, C. J.: Trigonal ice crystals in Earth's atmosphere, B.
Am. Meteorol. Soc., 96, 1519–1531,
https://doi.org/10.1175/BAMS-D-13-00128.1, 2015. a, b
Nelson, J.: Sublimation of ice crystals, J. Atmos. Sci., 55, 910–919,
https://doi.org/10.1175/1520-0469(1998)055<0910:SOIC>2.0.CO;2, 1998. a, b
Neshyba, S. P., Lowen, B., Benning, M., Lawson, A., and Rowe, P. M.: Roughness
metrics of prismatic facets of ice, J. Geophys. Res., 118, 3309–3318,
https://doi.org/10.1002/jgrd.50357, 2013. a, b
Ovarlez, J., Gayet, J.-F., Gierens, K., Ström, J., Ovarlez, H., Auriol, F.,
Busen, R., and Schumann, U.: Water vapour measurements inside cirrus clouds
in Northern and Southern hemispheres during INCA, Geophys. Res. Lett., 29,
60-1–60-4, https://doi.org/10.1029/2001GL014440, 2002. a
Pantaraks, P. and Flood, A. E.: Effect of growth rate history on current
crystal growth: A second look at surface effects on crystal growth rates,
Cryst. Growth Des., 5, 365–371, https://doi.org/10.1021/cg049863k, 2005. a, b
Pfalzgraff, W. C., Hulscher, R. M., and Neshyba, S. P.: Scanning electron microscopy
and molecular dynamics of surfaces of growing and ablating hexagonal
ice crystals, Atmos. Chem. Phys., 10, 2927–2935, https://doi.org/10.5194/acp-10-2927-2010, 2010. a
Pitter, R. L. and Pruppacher, H. R.: A wind tunnel investigation of freezing of
small water drops falling at terminal velocity in air, Q. J. Roy. Meteor.
Soc., 99, 540–550, https://doi.org/10.1002/qj.49709942111, 1973. a, b
Sassen, K., Wang, Z., and Liu, D.: Cirrus clouds and deep convection in the
tropics: Insights from CALIPSO and CloudSat, J. Geophys. Res., 114, D00H06,
https://doi.org/10.1029/2009JD011916, 2009. a
Sazaki, G., Zepeda, S., Nakatsubo, S., Yokoyama, E., and Furukawa, Y.:
Elementary steps at the surface of ice crystals visualized by advanced
optical microscopy, P. Natl. Acad. Sci. USA, 107, 19702–19707,
https://doi.org/10.1073/pnas.1008866107, 2010. a
Schmitt, C. G., Schnaiter, M., Heymsfield, A. J., Yang, P., Hirst, E., and
Bansemer, A.: The Microphysical Properties of Small Ice Particles Measured by
the Small Ice Detector-3 Probe during the MACPEX Field Campaign, J. Atmos.
Sci., 73, 4775–4791, https://doi.org/10.1175/JAS-D-16-0126.1, 2016. a
Schnaiter, M., Järvinen, E., Vochezer, P., Abdelmonem, A., Wagner, R., Jourdan, O.,
Mioche, G., Shcherbakov, V. N., Schmitt, C. G., Tricoli, U., Ulanowski, Z., and
Heymsfield, A. J.: Cloud chamber experiments on the origin of ice crystal
complexity in cirrus clouds, Atmos. Chem. Phys., 16, 5091–5110, https://doi.org/10.5194/acp-16-5091-2016, 2016. a, b, c
Spichtinger, P., Gierens, K., and Read, W.: The global distribution of
ice-supersaturated regions as seen by the Microwave Limb Sounder, Q. J. Roy.
Meteor. Soc., 129, 3391–3410, https://doi.org/10.1256/qj.02.141, 2003. a
Spichtinger, P., Gierens, K., Smit, H. G. J., Ovarlez, J., and Gayet, J.-F.:
On the distribution of relative humidity in cirrus clouds, Atmos. Chem. Phys., 4, 639–647, https://doi.org/10.5194/acp-4-639-2004, 2004. a
Stratmann, F., Kiselev, A., Wurzler, S., Wendisch, M., Heintzenberg, J.,
Charlson, R. J., Diehl, K., Wex, H., and Schmidt, S.: Laboratory studies and
numerical simulations of cloud droplet formation under realistic
supersaturation conditions, J. Atmos. Ocean. Technol., 21, 876–887,
https://doi.org/10.1175/1520-0426(2004)021<0876:LSANSO>2.0.CO;2, 2004. a, b
Takahashi, C. and Mori, M.: Growth of snow crystals from frozen water droplets,
Atmos. Res., 82, 385–390,
https://doi.org/10.1016/j.atmosres.2005.12.013, 2006. a
Ulanowski, Z., Hesse, E., Kaye, P. H., Baran, A. J., and Chandrasekhar, R.:
Scattering of light from atmospheric ice analogues, J. Quant. Spectrosc. Ra.,
79, 1091–1102, https://doi.org/10.1016/S0022-4073(02)00342-4, 2003. a
Ulanowski, Z., Connolly, P., Flynn, M., Gallagher, M., Clarke, A. J. M., and
Hesse, E.: Using ice crystal analogues to validate cloud ice parameter
retrievals from the CPI ice spectrometer data, Proc. 14 Int. Conf. Clouds and
Precip., 1175–1178, available at: http://hdl.handle.net/2299/6753 (last access: 13 September 2018),
2004. a
Ulanowski, Z., Hesse, E., Kaye, P. H., and Baran, A. J.: Light scattering by
complex ice-analogue crystals, J. Quant. Spectrosc. Ra., 100, 382–392,
https://doi.org/10.1016/j.jqsrt.2005.11.052, 2006. a
Ulanowski, Z., Hirst, E., Kaye, P. H., and Greenaway, R.: Retrieving the size
of particles with rough and complex surfaces from two-dimensional scattering
patterns, J. Quant. Spectrosc. Ra., 113, 2457–2464,
https://doi.org/10.1016/j.jqsrt.2012.06.019, 2012. a, b, c
Ulanowski, Z., Kaye, P. H., Hirst, E., Greenaway, R. S., Cotton, R. J., Hesse, E.,
and Collier, C. T.: Incidence of rough and irregular atmospheric ice particles from
Small Ice Detector 3 measurements, Atmos. Chem. Phys., 14, 1649–1662, https://doi.org/10.5194/acp-14-1649-2014, 2014. a, b, c, d, e, f, g, h, i, j, k, l, m
Voigtländer, J., Stratmann, F., Niedermeier, D., Wex, H., and Kiselev, A.:
Mass accommodation coefficient of water: A combined computational fluid
dynamics and experimental data analysis, J. Geophys. Res., 112, D20208,
https://doi.org/10.1029/2007JD008604, 2007. a
Westbrook, C. D. and Heymsfield, A. J.: Ice crystals growing from vapor in
supercooled clouds between −2.5 ∘C and −22 ∘C: Testing current
parameterization methods using laboratory data, J. Atmos. Sci., 68,
2416–2429, https://doi.org/10.1175/JAS-D-11-017.1, 2011. a
Wylie, D., Jackson, D. L., Menzel, W. P., and Bates, J. J.: Trends in global
cloud cover in two decades of HIRS observations, J. Climate, 18, 3021–3031,
https://doi.org/10.1175/JCLI3461.1, 2005. a
Yang, P., Hong, G., Kattawar, G. W., Minnis, P., and Hu, Y.: Uncertainties
associated with the surface texture of ice particles in satellite-based
retrieval of cirrus clouds – Part II: Effect of particle surface roughness
on retrieved cloud optical thickness and effective particle size, IEEE T.
Geosci. Remote Sens., 46, 1948–1957,
https://doi.org/10.1109/TGRS.2008.916472, 2008a. a
Yang, P., Kattawar, G. W., Hong, G., Minnis, P., and Hu, Y.: Uncertainties
associated with the surface texture of ice particles in satellite-based
retrieval of cirrus clouds – Part I: Single-scattering properties of ice
crystals with surface roughness, IEEE T. Geosci. Remote Sens., 46,
1940–1947, https://doi.org/10.1109/TGRS.2008.916471, 2008b.
a
Yang, P., Liou, K.-N., Bi, L., Liu, C., Yi, B., and Baum, B. A.: On the
radiative properties of ice clouds: Light scattering, remote sensing, and
radiation parameterization, Adv. Atmos. Sci., 32, 32–63,
https://doi.org/10.1007/s00376-014-0011-z, 2015. a, b
Yi, B., Yang, P., Baum, B. A., L'Ecuyer, T., Oreopoulos, L., Mlawer, E. J.,
Heymsfield, A. J., and Liou, K.-N.: Influence of ice particle surface
roughening on the global cloud radiative effect, J. Atmos. Sci., 70,
2794–2807, https://doi.org/10.1175/JAS-D-13-020.1, 2013. a
Yokoyama, E. and Kuroda, T.: Pattern formation in growth of snow crystals
occurring in the surface kinetic process and the diffusion process, Phys.
Rev. A, 41, 2038–2050, https://doi.org/10.1103/PhysRevA.41.2038, 1990. a, b, c
Short summary
Surface roughness of ice crystals has recently been acknowledged to strongly influence the radiative properties of cold clouds such as cirrus, but it is unclear how this roughness arises. The study investigates the origins of ice surface roughness under a variety of atmospherically relevant conditions, using a novel method to measure roughness quantitatively. It is found that faster growth leads to stronger roughness. Roughness also increases following repeated growth–sublimation cycles.
Surface roughness of ice crystals has recently been acknowledged to strongly influence the...
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