Articles | Volume 22, issue 3
https://doi.org/10.5194/acp-22-2135-2022
© Author(s) 2022. 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-22-2135-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Feb 2022
Research article |
| 15 Feb 2022
| 15 Feb 2022
A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations
School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia
Luis Ackermann
School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia
Australian Research Council Centre of Excellence for Climate Extremes (CLEX), Melbourne, VIC, Australia
Australian Research Council Centre of Excellence for Climate Extremes (CLEX), Melbourne, VIC, Australia
School of Earth Sciences, University of Melbourne, Melbourne, VIC, Australia
Son C. H. Truong
School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia
Australian Research Council Centre of Excellence for Climate Extremes (CLEX), Melbourne, VIC, Australia
Steven T. Siems
School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia
Australian Research Council Centre of Excellence for Climate Extremes (CLEX), Melbourne, VIC, Australia
Michael J. Manton
School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia
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Clouds over the Southern Ocean are crucial to Earth's energy balance, but understanding the factors that control them is complex. Our research examines how weather patterns affect tiny particles called cloud condensation nuclei (CCN), which influence cloud properties. Using data from Kennaook / Cape Grim, we found that winter air from Antarctica brings cleaner conditions with lower CCN, while summer patterns from Australia transport more particles. Precipitation also helps reduce CCN in winter.
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Marine low-level clouds play a crucial role in the Earth's energy balance, trapping heat from the surface and reflecting sunlight back into space. These clouds are distinguishable by their large-scale spatial structures, primarily characterized as hexagonal patterns with either filled (closed) or empty (open) cells. Utilizing satellite observations, these two cloud type patterns have been categorized over the Southern Ocean and North Pacific Ocean through a pattern recognition program.
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Clouds over the Southern Ocean are crucial to Earth's energy balance, but understanding the factors that control them is complex. Our research examines how weather patterns affect tiny particles called cloud condensation nuclei (CCN), which influence cloud properties. Using data from Kennaook / Cape Grim, we found that winter air from Antarctica brings cleaner conditions with lower CCN, while summer patterns from Australia transport more particles. Precipitation also helps reduce CCN in winter.
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Subject: Clouds and Precipitation | Research Activity: Remote Sensing | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Zhenquan Wang
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Mengyuan Wang, Min Min, Jun Li, Han Lin, Yongen Liang, Binlong Chen, Zhigang Yao, Na Xu, and Miao Zhang
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Zhenquan Wang and Jian Yuan
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Tropical convection organizations are normally connected complexes of many convective activities. In this work, a novel variable-brightness-temperature segment tracking algorithm is established to partition the complex convective organizations into structural components of single cold cores for tracking separately. The duration, precipitation and anvil amount of the tracked organization segments have strong loglinear relationships with brightness temperature structures.
Anna Tippett, Edward Gryspeerdt, Peter Manshausen, Philip Stier, and Tristan W. P. Smith
Atmos. Chem. Phys., 24, 13269–13283, https://doi.org/10.5194/acp-24-13269-2024, https://doi.org/10.5194/acp-24-13269-2024, 2024
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Ship emissions can form artificially brightened clouds, known as ship tracks, and provide us with an opportunity to investigate how aerosols interact with clouds. Previous studies that used ship tracks suggest that clouds can experience large increases in the amount of water (LWP) from aerosols. Here, we show that there is a bias in previous research and that, when we account for this bias, the LWP response to aerosols is much weaker than previously reported.
Xiaoting Chen, Claudia J. Stubenrauch, and Giulio Mandorli
EGUsphere, https://doi.org/10.5194/egusphere-2024-3434, https://doi.org/10.5194/egusphere-2024-3434, 2024
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Strongly precipitating mesoscale convective systems produce large diabatic heating of the atmosphere, influencing atmospheric circulation. Their complete 3D description, attained by machine learning techniques in combination with satellite observations, has enabled a detailed study of the relationship between latent and radiative heating in these cloud systems. Convective organization increases both the average and vertical gradient of radiative effects of the mesoscale convective systems.
Kerstin Ebell, Christian Buhren, Rosa Gierens, Giovanni Chellini, Melanie Lauer, Andreas Walbröl, Sandro Dahlke, Pavel Krobot, and Mario Mech
EGUsphere, https://doi.org/10.5194/egusphere-2024-3368, https://doi.org/10.5194/egusphere-2024-3368, 2024
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Ground-based observations of precipitation are rare in the Arctic. In 2017, additional precipitation measurements by a precipitation gauge, a laser disdrometer, and a micro rain radar were established at the Arctic station AWIPEV in Ny-Ålesund, Svalbard. We present statistics on precipitation amount, frequency, and type for the first years of data. Large-scale systems like atmospheric rivers and cyclones strongly contribute to precipitation and, in particular, to extreme precipitation events.
Nikos Benas, Jan Fokke Meirink, Rob Roebeling, and Martin Stengel
EGUsphere, https://doi.org/10.5194/egusphere-2024-3135, https://doi.org/10.5194/egusphere-2024-3135, 2024
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This study examines how ship emissions affect clouds over a shipping corridor in the southeastern Atlantic. Using satellite data from 2004 to 2023, we find that ship emissions increase the number of cloud droplets while reducing their size, and slightly decrease cloud water content. Effects on seasonal and daily patterns vary based on regional factors. The impact of emissions weakened after stricter regulations were implemented in 2020.
Zackary Mages, Pavlos Kollias, Bernat Puigdomenech Treserras, Paloma Borque, and Mariko Oue
EGUsphere, https://doi.org/10.5194/egusphere-2024-2984, https://doi.org/10.5194/egusphere-2024-2984, 2024
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Convective clouds are a key component of the climate system. Using remote sensing observations during two field experiments in Houston, Texas, we identify four diurnal patterns of shallow convective clouds. We find areas more frequently experiencing shallow convective clouds, and we find areas where the vertical extent of shallow convective clouds is higher and where they are more likely to precipitate. This provides insight into the complicated environment that forms these clouds in Houston.
Rebecca J. Murray-Watson and Edward Gryspeerdt
Atmos. Chem. Phys., 24, 11115–11132, https://doi.org/10.5194/acp-24-11115-2024, https://doi.org/10.5194/acp-24-11115-2024, 2024
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The formation of mixed-phase clouds during marine cold-air outbreaks is not well understood. Our study, using satellite data and Lagrangian trajectories, reveals that the occurrence of these clouds depends on both time and temperature, influenced partly by the presence of biological ice-nucleating particles. This highlights the importance of comprehending local aerosol dynamics for precise modelling of cloud-phase transitions in the Arctic.
Yuxin Zhao, Jiming Li, Deyu Wen, Yarong Li, Yuan Wang, and Jianping Huang
Atmos. Chem. Phys., 24, 9435–9457, https://doi.org/10.5194/acp-24-9435-2024, https://doi.org/10.5194/acp-24-9435-2024, 2024
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This study identifies deep convection systems (DCSs), including deep convection cores and anvils, over the Tibetan Plateau (TP) and tropical Indian Ocean (TO). The DCSs over the TP are less frequent, showing narrower and thinner cores and anvils compared to those over the TO. TP DCSs show a stronger longwave cloud radiative effect at the surface and in the low-level atmosphere. Distinct aerosol–cloud–precipitation interaction is found in TP DCSs, probably due to the cold cloud bases.
Grégory V. Cesana, Olivia Pierpaoli, Matteo Ottaviani, Linh Vu, Zhonghai Jin, and Israel Silber
Atmos. Chem. Phys., 24, 7899–7909, https://doi.org/10.5194/acp-24-7899-2024, https://doi.org/10.5194/acp-24-7899-2024, 2024
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Better characterizing the relationship between sea ice and clouds is key to understanding Arctic climate because clouds and sea ice affect surface radiation and modulate Arctic surface warming. Our results indicate that Arctic liquid clouds robustly increase in response to sea ice decrease. This increase has a cooling effect on the surface because more solar radiation is reflected back to space, and it should contribute to dampening future Arctic surface warming.
Albert Ansmann, Cristofer Jimenez, Johanna Roschke, Johannes Bühl, Kevin Ohneiser, Ronny Engelmann, Martin Radenz, Hannes Griesche, Julian Hofer, Dietrich Althausen, Daniel A. Knopf, Sandro Dahlke, Tom Gaudek, Patric Seifert, and Ulla Wandinger
EGUsphere, https://doi.org/10.5194/egusphere-2024-2008, https://doi.org/10.5194/egusphere-2024-2008, 2024
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In this study, we focus on the potential impact of wildfire smoke on cirrus formation. For the first time, state-of-the-art aerosol and cirrus observations with lidar and radar, presented in part 1 of a series of two articles, are closely linked to comprehensive modeling of gravity-wave-induced ice nucleation in cirrus evolution processes, presented in part 2. We found a clear impact of wildfire smoke on cirrus evolution.
Ziming Wang, Husi Letu, Huazhe Shang, and Luca Bugliaro
Atmos. Chem. Phys., 24, 7559–7574, https://doi.org/10.5194/acp-24-7559-2024, https://doi.org/10.5194/acp-24-7559-2024, 2024
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The supercooled liquid fraction (SLF) in mixed-phase clouds is retrieved for the first time using passive geostationary satellite observations based on differences in liquid droplet and ice particle radiative properties. The retrieved results are comparable to global distributions observed by active instruments, and the feasibility of the retrieval method to analyze the observed trends of the SLF has been validated.
Barbara Dietel, Odran Sourdeval, and Corinna Hoose
Atmos. Chem. Phys., 24, 7359–7383, https://doi.org/10.5194/acp-24-7359-2024, https://doi.org/10.5194/acp-24-7359-2024, 2024
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Uncertainty with respect to cloud phases over the Southern Ocean and Arctic marine regions leads to large uncertainties in the radiation budget of weather and climate models. This study investigates the phases of low-base and mid-base clouds using satellite-based remote sensing data. A comprehensive analysis of the correlation of cloud phase with various parameters, such as temperature, aerosols, sea ice, vertical and horizontal cloud extent, and cloud radiative effect, is presented.
Ryan Eastman, Isabel L. McCoy, Hauke Schulz, and Robert Wood
Atmos. Chem. Phys., 24, 6613–6634, https://doi.org/10.5194/acp-24-6613-2024, https://doi.org/10.5194/acp-24-6613-2024, 2024
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Cloud types are determined using machine learning image classifiers applied to satellite imagery for 1 year in the North Atlantic. This survey of these cloud types shows that the climate impact of a cloud scene is, in part, a function of cloud type. Each type displays a different mix of thick and thin cloud cover, with the fraction of thin cloud cover having the strongest impact on the clouds' radiative effect. Future studies must account for differing properties and processes among cloud types.
Thomas Lesigne, François Ravetta, Aurélien Podglajen, Vincent Mariage, and Jacques Pelon
Atmos. Chem. Phys., 24, 5935–5952, https://doi.org/10.5194/acp-24-5935-2024, https://doi.org/10.5194/acp-24-5935-2024, 2024
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Upper tropical clouds have a strong impact on Earth's climate but are challenging to observe. We report the first long-duration observations of tropical clouds from lidars flying on board stratospheric balloons. Comparisons with spaceborne observations reveal the enhanced sensitivity of balloon-borne lidar to optically thin cirrus. These clouds, which have a significant coverage and lie in the uppermost troposphere, are linked with the dehydration of air masses on their way to the stratosphere.
Georgios Dekoutsidis, Martin Wirth, and Silke Groß
Atmos. Chem. Phys., 24, 5971–5987, https://doi.org/10.5194/acp-24-5971-2024, https://doi.org/10.5194/acp-24-5971-2024, 2024
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For decades the earth's temperature has been rising. The Arctic regions are warming faster. Cirrus clouds can contribute to this phenomenon. During warm-air intrusions, air masses are transported into the Arctic from the mid-latitudes. The HALO-(AC)3 campaign took place to measure cirrus during intrusion events and under normal conditions. We study the two cloud types based on these measurements and find differences in their geometry, relative humidity distribution and vertical structure.
Huige Di and Yun Yuan
Atmos. Chem. Phys., 24, 5783–5801, https://doi.org/10.5194/acp-24-5783-2024, https://doi.org/10.5194/acp-24-5783-2024, 2024
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We observed the seeder–feeder process among double-layer clouds using a cloud radar and microwave radiometer. By defining the parameters of the seeding depth and seeding time of the upper cloud affecting the lower cloud, we find that the cloud particle terminal velocity is significantly enhanced during the seeder–feeder period, and the lower the height and thinner the thickness of the height difference between double-layer clouds, the lower the height and thicker the thickness of seeding depth.
Kristofer S. Tuftedal, Bernat Puigdomènech Treserras, Mariko Oue, and Pavlos Kollias
Atmos. Chem. Phys., 24, 5637–5657, https://doi.org/10.5194/acp-24-5637-2024, https://doi.org/10.5194/acp-24-5637-2024, 2024
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This study analyzed coastal convective cells from June through September 2018–2021. The cells were classified and their lifecycles were analyzed to better understand their characteristics. Features such as convective-core growth, for example, are shown. The study found differences in the initiation location of shallow convection and in the aerosol loading in deep convective environments. This work provides a foundation for future analyses of convection or other tracked events elsewhere.
Michie Vianca De Vera, Larry Di Girolamo, Guangyu Zhao, Robert M. Rauber, Stephen W. Nesbitt, and Greg M. McFarquhar
Atmos. Chem. Phys., 24, 5603–5623, https://doi.org/10.5194/acp-24-5603-2024, https://doi.org/10.5194/acp-24-5603-2024, 2024
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Tropical oceanic low clouds remain a dominant source of uncertainty in cloud feedback in climate models due to their macrophysical properties (fraction, size, height, shape, distribution) being misrepresented. High-resolution satellite imagery over the Philippine oceans is used here to characterize cumulus macrophysical properties and their relationship to meteorological variables. Such information can act as a benchmark for cloud models and can improve low-cloud generation in climate models.
William K. Jones, Martin Stengel, and Philip Stier
Atmos. Chem. Phys., 24, 5165–5180, https://doi.org/10.5194/acp-24-5165-2024, https://doi.org/10.5194/acp-24-5165-2024, 2024
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Storm clouds cover large areas of the tropics. These clouds both reflect incoming sunlight and trap heat from the atmosphere below, regulating the temperature of the tropics. Over land, storm clouds occur in the late afternoon and evening and so exist both during the daytime and at night. Changes in this timing could upset the balance of the respective cooling and heating effects of these clouds. We find that isolated storms have a larger effect on this balance than their small size suggests.
George Horner and Edward Gryspeerdt
EGUsphere, https://doi.org/10.5194/egusphere-2024-1090, https://doi.org/10.5194/egusphere-2024-1090, 2024
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This work tracks the lifecycle of thin cirrus clouds that flow out of tropical convective storms. These cirrus clouds are found to have a warming effect on the atmosphere over their whole lifetime. Thin cirrus that originate from land origin convection warm more than those of ocean origin. Moreover, if the lifetime of these cirrus clouds increase, the warming they exert over their whole lifetime also increases. These results help us understand how these clouds might change in a future climate.
Shaoyue Qiu, Xue Zheng, David Painemal, Christopher R. Terai, and Xiaoli Zhou
Atmos. Chem. Phys., 24, 2913–2935, https://doi.org/10.5194/acp-24-2913-2024, https://doi.org/10.5194/acp-24-2913-2024, 2024
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The aerosol indirect effect (AIE) depends on cloud states, which exhibit significant diurnal variations in the northeastern Atlantic. Yet the AIE diurnal cycle remains poorly understood. Using satellite retrievals, we find a pronounced “U-shaped” diurnal variation in the AIE, which is contributed to by the transition of cloud states combined with the lagged cloud responses. This suggests that polar-orbiting satellites with overpass times at noon underestimate daytime mean values of the AIE.
Irene Bartolomé García, Odran Sourdeval, Reinhold Spang, and Martina Krämer
Atmos. Chem. Phys., 24, 1699–1716, https://doi.org/10.5194/acp-24-1699-2024, https://doi.org/10.5194/acp-24-1699-2024, 2024
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How many ice crystals of each size are in a cloud is a key parameter for the retrieval of cloud properties. The distribution of ice crystals is obtained from in situ measurements and used to create parameterizations that can be used when analyzing the remote-sensing data. Current parameterizations are based on data sets that do not include reliable measurements of small crystals, but in our study we use a data set that includes very small ice crystals to improve these parameterizations.
Wenyue Wang, Klemens Hocke, Leonardo Nania, Alberto Cazorla, Gloria Titos, Renaud Matthey, Lucas Alados-Arboledas, Agustín Millares, and Francisco Navas-Guzmán
Atmos. Chem. Phys., 24, 1571–1585, https://doi.org/10.5194/acp-24-1571-2024, https://doi.org/10.5194/acp-24-1571-2024, 2024
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The south-central interior of Andalusia experiences complex precipitation patterns as a result of the semi-arid Mediterranean climate and the influence of Saharan dust. This study monitored the inter-relations between aerosols, clouds, meteorological variables, and precipitation systems using ground-based remote sensing and in situ instruments.
Francisco Lang, Steven T. Siems, Yi Huang, Tahereh Alinejadtabrizi, and Luis Ackermann
Atmos. Chem. Phys., 24, 1451–1466, https://doi.org/10.5194/acp-24-1451-2024, https://doi.org/10.5194/acp-24-1451-2024, 2024
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Marine low-level clouds play a crucial role in the Earth's energy balance, trapping heat from the surface and reflecting sunlight back into space. These clouds are distinguishable by their large-scale spatial structures, primarily characterized as hexagonal patterns with either filled (closed) or empty (open) cells. Utilizing satellite observations, these two cloud type patterns have been categorized over the Southern Ocean and North Pacific Ocean through a pattern recognition program.
Julian Hofer, Patric Seifert, J. Ben Liley, Martin Radenz, Osamu Uchino, Isamu Morino, Tetsu Sakai, Tomohiro Nagai, and Albert Ansmann
Atmos. Chem. Phys., 24, 1265–1280, https://doi.org/10.5194/acp-24-1265-2024, https://doi.org/10.5194/acp-24-1265-2024, 2024
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An 11-year dataset of polarization lidar observations from Lauder, New Zealand / Aotearoa, was used to distinguish the thermodynamic phase of natural clouds. The cloud dataset was separated to assess the impact of air mass origin on the frequency of heterogeneous ice formation. Ice formation efficiency in clouds above Lauder was found to be lower than in the polluted Northern Hemisphere midlatitudes but higher than in very clean and pristine environments, such as Punta Arenas in southern Chile.
Hannes Jascha Griesche, Carola Barrientos-Velasco, Hartwig Deneke, Anja Hünerbein, Patric Seifert, and Andreas Macke
Atmos. Chem. Phys., 24, 597–612, https://doi.org/10.5194/acp-24-597-2024, https://doi.org/10.5194/acp-24-597-2024, 2024
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The Arctic is strongly affected by climate change and the role of clouds therein is not yet completely understood. Measurements from the Arctic expedition PS106 were used to simulate radiative fluxes with and without clouds at very low altitudes (below 165 m), and their radiative effect was calculated to be 54 Wm-2. The low heights of these clouds make them hard to observe. This study shows the importance of accurate measurements and simulations of clouds and gives suggestions for improvements.
Thomas D. DeWitt, Timothy J. Garrett, Karlie N. Rees, Corey Bois, Steven K. Krueger, and Nicolas Ferlay
Atmos. Chem. Phys., 24, 109–122, https://doi.org/10.5194/acp-24-109-2024, https://doi.org/10.5194/acp-24-109-2024, 2024
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Viewed from space, a defining feature of Earth's atmosphere is the wide spectrum of cloud sizes. A recent study predicted the distribution of cloud sizes, and this paper compares the prediction to observations. Although there is nuance in viewing perspective, we find robust agreement with theory across different climatological conditions, including land–ocean contrasts, time of year, or latitude, suggesting a minor role for Coriolis forces, aerosol loading, or surface temperature.
Marcus Klingebiel, André Ehrlich, Elena Ruiz-Donoso, Nils Risse, Imke Schirmacher, Evelyn Jäkel, Michael Schäfer, Kevin Wolf, Mario Mech, Manuel Moser, Christiane Voigt, and Manfred Wendisch
Atmos. Chem. Phys., 23, 15289–15304, https://doi.org/10.5194/acp-23-15289-2023, https://doi.org/10.5194/acp-23-15289-2023, 2023
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In this study we explain how we use aircraft measurements from two Arctic research campaigns to identify cloud properties (like droplet size) over sea-ice and ice-free ocean. To make sure that our measurements make sense, we compare them with other observations. Our results show, e.g., larger cloud droplets in early summer than in spring. Moreover, the cloud droplets are also larger over ice-free ocean than compared to sea ice. In the future, our data can be used to improve climate models.
Pablo Saavedra Garfias, Heike Kalesse-Los, Luisa von Albedyll, Hannes Griesche, and Gunnar Spreen
Atmos. Chem. Phys., 23, 14521–14546, https://doi.org/10.5194/acp-23-14521-2023, https://doi.org/10.5194/acp-23-14521-2023, 2023
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An important Arctic climate process is the release of heat fluxes from sea ice openings to the atmosphere that influence the clouds. The characterization of this process is the objective of this study. Using synergistic observations from the MOSAiC expedition, we found that single-layer cloud properties show significant differences when clouds are coupled or decoupled to the water vapour transport which is used as physical link between the upwind sea ice openings and the cloud under observation.
Matthew D. Lebsock and Mikael Witte
Atmos. Chem. Phys., 23, 14293–14305, https://doi.org/10.5194/acp-23-14293-2023, https://doi.org/10.5194/acp-23-14293-2023, 2023
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This paper evaluates measurements of cloud drop size distributions made from airplanes. We find that as the number of cloud drops increases the distribution of the cloud drop sizes narrows. The data are used to develop a simple equation that relates the drop number to the width of the drop sizes. We then use this equation to demonstrate that existing approaches to observe the drop number from satellites contain errors that can be corrected by including the new relationship.
George Horner and Edward Gryspeerdt
Atmos. Chem. Phys., 23, 14239–14253, https://doi.org/10.5194/acp-23-14239-2023, https://doi.org/10.5194/acp-23-14239-2023, 2023
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Tropical deep convective clouds, and the thin cirrus (ice) clouds that flow out from them, are important for modulating the energy budget of the tropical atmosphere. This work uses a new method to track the evolution of the properties of these clouds across their entire lifetimes. We find these clouds cool the atmosphere in the first 6 h before switching to a warming regime after the deep convective core has dissipated, which is sustained beyond 120 h from the initial convective event.
Rodanthi-Elisavet Mamouri, Albert Ansmann, Kevin Ohneiser, Daniel A. Knopf, Argyro Nisantzi, Johannes Bühl, Ronny Engelmann, Annett Skupin, Patric Seifert, Holger Baars, Dragos Ene, Ulla Wandinger, and Diofantos Hadjimitsis
Atmos. Chem. Phys., 23, 14097–14114, https://doi.org/10.5194/acp-23-14097-2023, https://doi.org/10.5194/acp-23-14097-2023, 2023
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For the first time, rather clear evidence is found that wildfire smoke particles can trigger strong cirrus formation. This finding is of importance because intensive and large wildfires may occur increasingly often in the future as climate change proceeds. Based on lidar observations in Cyprus in autumn 2020, we provide detailed insight into the cirrus formation at the tropopause in the presence of aged wildfire smoke (here, 8–9 day old Californian wildfire smoke).
Peter Manshausen, Duncan Watson-Parris, Matthew W. Christensen, Jukka-Pekka Jalkanen, and Philip Stier
Atmos. Chem. Phys., 23, 12545–12555, https://doi.org/10.5194/acp-23-12545-2023, https://doi.org/10.5194/acp-23-12545-2023, 2023
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Aerosol from burning fuel changes cloud properties, e.g., the number of droplets and the content of water. Here, we study how clouds respond to different amounts of shipping aerosol. Droplet numbers increase linearly with increasing aerosol over a broad range until they stop increasing, while the amount of liquid water always increases, independently of emission amount. These changes in cloud properties can make them reflect more or less sunlight, which is important for the earth's climate.
Hendrik Andersen, Jan Cermak, Alyson Douglas, Timothy A. Myers, Peer Nowack, Philip Stier, Casey J. Wall, and Sarah Wilson Kemsley
Atmos. Chem. Phys., 23, 10775–10794, https://doi.org/10.5194/acp-23-10775-2023, https://doi.org/10.5194/acp-23-10775-2023, 2023
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This study uses an observation-based cloud-controlling factor framework to study near-global sensitivities of cloud radiative effects to a large number of meteorological and aerosol controls. We present near-global sensitivity patterns to selected thermodynamic, dynamic, and aerosol factors and discuss the physical mechanisms underlying the derived sensitivities. Our study hopes to guide future analyses aimed at constraining cloud feedbacks and aerosol–cloud interactions.
Anne-Claire Billault-Roux, Paraskevi Georgakaki, Josué Gehring, Louis Jaffeux, Alfons Schwarzenboeck, Pierre Coutris, Athanasios Nenes, and Alexis Berne
Atmos. Chem. Phys., 23, 10207–10234, https://doi.org/10.5194/acp-23-10207-2023, https://doi.org/10.5194/acp-23-10207-2023, 2023
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Secondary ice production plays a key role in clouds and precipitation. In this study, we analyze radar measurements from a snowfall event in the Jura Mountains. Complex signatures are observed, which reveal that ice crystals were formed through various processes. An analysis of multi-sensor data suggests that distinct ice multiplication processes were taking place. Both the methods used and the insights gained through this case study contribute to a better understanding of snowfall microphysics.
Rebecca J. Murray-Watson, Edward Gryspeerdt, and Tom Goren
Atmos. Chem. Phys., 23, 9365–9383, https://doi.org/10.5194/acp-23-9365-2023, https://doi.org/10.5194/acp-23-9365-2023, 2023
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Clouds formed in Arctic marine cold air outbreaks undergo a distinct evolution, but the factors controlling their transition from high-coverage to broken cloud fields are poorly understood. We use satellite and reanalysis data to study how these clouds develop in time and the different influences on their evolution. The aerosol concentration is correlated with cloud break-up; more aerosol is linked to prolonged coverage and a stronger cooling effect, with implications for a more polluted Arctic.
Michael S. Diamond
Atmos. Chem. Phys., 23, 8259–8269, https://doi.org/10.5194/acp-23-8259-2023, https://doi.org/10.5194/acp-23-8259-2023, 2023
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Fuel sulfur regulations were implemented for ships in 2020 to improve air quality but may also accelerate global warming. We use spatial statistics and satellite retrievals to detect changes in the size of cloud droplets and find evidence for a resulting decrease in cloud brightness within a major shipping corridor after the sulfur limits went into effect. Our results confirm both that the regulations are being followed and that they are having a warming influence via their effect on clouds.
Hao Luo, Johannes Quaas, and Yong Han
Atmos. Chem. Phys., 23, 8169–8186, https://doi.org/10.5194/acp-23-8169-2023, https://doi.org/10.5194/acp-23-8169-2023, 2023
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Clouds exhibit a wide range of vertical structures with varying microphysical and radiative properties. We show a global survey of spatial distribution, vertical extent and radiative effect of various classified cloud vertical structures using joint satellite observations from the new CCCM datasets during 2007–2010. Moreover, the long-term trends in CVSs are investigated based on different CMIP6 future scenarios to capture the cloud variations with different, increasing anthropogenic forcings.
Gregor Köcher, Tobias Zinner, and Christoph Knote
Atmos. Chem. Phys., 23, 6255–6269, https://doi.org/10.5194/acp-23-6255-2023, https://doi.org/10.5194/acp-23-6255-2023, 2023
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Polarimetric radar observations of 30 d of convective precipitation events are used to statistically analyze 5 state-of-the-art microphysics schemes of varying complexity. The frequency and area of simulated heavy-precipitation events are in some cases significantly different from those observed, depending on the microphysics scheme. Analysis of simulated particle size distributions and reflectivities shows that some schemes have problems reproducing the correct particle size distributions.
Claudia J. Stubenrauch, Giulio Mandorli, and Elisabeth Lemaitre
Atmos. Chem. Phys., 23, 5867–5884, https://doi.org/10.5194/acp-23-5867-2023, https://doi.org/10.5194/acp-23-5867-2023, 2023
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Organized convection leads to large convective cloud systems and intense rain and may change with a warming climate. Their complete 3D description, attained by machine learning techniques in combination with various satellite observations, together with a cloud system concept, link convection to anvil properties, while convective organization can be identified by the horizontal structure of intense rain.
Scott E. Giangrande, Thiago S. Biscaro, and John M. Peters
Atmos. Chem. Phys., 23, 5297–5316, https://doi.org/10.5194/acp-23-5297-2023, https://doi.org/10.5194/acp-23-5297-2023, 2023
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Our study tracks thunderstorms observed during the wet and dry seasons of the Amazon Basin using weather radar. We couple this precipitation tracking with opportunistic overpasses of a wind profiler and other ground observations to add unique insights into the upwards and downwards air motions within these clouds at various stages in the storm life cycle. The results of a simple updraft model are provided to give physical explanations for observed seasonal differences.
Edward Gryspeerdt, Adam C. Povey, Roy G. Grainger, Otto Hasekamp, N. Christina Hsu, Jane P. Mulcahy, Andrew M. Sayer, and Armin Sorooshian
Atmos. Chem. Phys., 23, 4115–4122, https://doi.org/10.5194/acp-23-4115-2023, https://doi.org/10.5194/acp-23-4115-2023, 2023
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The impact of aerosols on clouds is one of the largest uncertainties in the human forcing of the climate. Aerosol can increase the concentrations of droplets in clouds, but observational and model studies produce widely varying estimates of this effect. We show that these estimates can be reconciled if only polluted clouds are studied, but this is insufficient to constrain the climate impact of aerosol. The uncertainty in aerosol impact on clouds is currently driven by cases with little aerosol.
Zackary Mages, Pavlos Kollias, Zeen Zhu, and Edward P. Luke
Atmos. Chem. Phys., 23, 3561–3574, https://doi.org/10.5194/acp-23-3561-2023, https://doi.org/10.5194/acp-23-3561-2023, 2023
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Cold-air outbreaks (when cold air is advected over warm water and creates low-level convection) are a dominant cloud regime in the Arctic, and we capitalized on ground-based observations, which did not previously exist, from the COMBLE field campaign to study them. We characterized the extent and strength of the convection and turbulence and found evidence of secondary ice production. This information is useful for model intercomparison studies that will represent cold-air outbreak processes.
Cited articles
Abel, S. J., Boutle, I. A., Waite, K., Fox, S., Brown, P. R., Cotton, R.,
Lloyd, G., Choularton, T. W., and Bower, K. N.: The role of precipitation in
controlling the transition from stratocumulus to cumulus clouds in a Northern
Hemisphere cold-air outbreak, J. Atmos. Sci., 74,
2293–2314, https://doi.org/10.1175/JAS-D-16-0362.1, 2017. a, b
Ahn, E., Huang, Y., Chubb, T. H., Baumgardner, D., Isaac, P., de Hoog, M.,
Siems, S. T., and Manton, M. J.: In situ observations of wintertime
low-altitude clouds over the Southern Ocean, Q. J. Roy.
Meteorol. Soc., 143, 1381–1394,
https://doi.org/10.1002/qj.3011, 2017. a, b, c
Atkinson, B. W. and Zhang, J. W.: Mesoscale shallow convection in the
atmosphere, Rev. Geophys., 34, 403–431,
https://doi.org/10.1029/96RG02623, 1996. a, b, c
Bauer, M. and Del Genio, A. D.: Composite analysis of winter cyclones in a GCM:
Influence on climatological humidity, J. Clim., 19, 1652–1672,
https://doi.org/10.1175/JCLI3690.1, 2006. a
Bates, T. S., Huebert, B. J., Gras, J. L., Griffiths, F. B., and Durkee, P. A.:
International Global Atmospheric Chemistry (IGAC) project's first aerosol
characterization experiment (ACE 1): Overview, J. Geophys.
Res.-Atmos., 103, 16297–16318,
https://doi.org/10.1029/97JD03741, 1998. a
Behrangi, A., Lebsock, M., Wong, S., and Lambrigtsen, B.: On the
quantification of oceanic rainfall using spaceborne sensors, J.
Geophys. Res.-Atmos., 117, D20105, https://doi.org/10.1029/2012JD017979,
2012. a
Behrangi, A., Stephens, G., Adler, R. F., Huffman, G. J., Lambrigtsen, B., and
Lebsock, M.: An update on the oceanic precipitation rate and its zonal
distribution in light of advanced observations from space, J.
Clim., 27, 3957–3965, https://doi.org/10.1175/JCLI-D-13-00679.1, 2014. a
Berry, G., Reeder, M. J., and Jakob, C.: A global climatology of atmospheric
fronts, Geophys. Res. Lett., 38, L04809,
https://doi.org/10.1029/2010GL046451, 2011. a, b, c
Bessho, K., Date, K., Hayashi, M., Ikeda, A., Imai, T., Inoue, H., Kumagai, Y.,
Miyakawa, T., Murata, H., Ohno, T., Okuyama, A., Oyama, R.,
Sasaki, Y., Shimazu, Y., Shimoji, K., Sumida, Y., Suzuki, M., Taniguchi, H.,
Tsuchiyama, H., Uesawa, D., Yokota, H., and Yoshida, R.: An introduction to
Himawari-8/9 – Japan's new-generation geostationary meteorological
satellites, J. Meteorol. Soc. Japn.. Ser. II, 94,
151–183, https://doi.org/10.2151/jmsj.2016-009, 2016. a
Bodas-Salcedo, A., Williams, K., Field, P., and Lock, A.: The surface
downwelling solar radiation surplus over the Southern Ocean in the Met Office
model: The role of midlatitude cyclone clouds, J. Clim., 25,
7467–7486, https://doi.org/10.1175/JCLI-D-11-00702.1, 2012. a, b
Bodas-Salcedo, A., Williams, K. D., Ringer, M. A., Beau, I., Cole, J. N.,
Dufresne, J.-L., Koshiro, T., Stevens, B., Wang, Z., and Yokohata, T.:
Origins of the solar radiation biases over the Southern Ocean in CFMIP2
models, J. Clim., 27, 41–56,
https://doi.org/10.1175/JCLI-D-13-00169.1, 2014. a
Bodas-Salcedo, A., Hill, P., Furtado, K., Williams, K., Field, P., Manners, J.,
Hyder, P., and Kato, S.: Large contribution of supercooled liquid clouds to
the solar radiation budget of the Southern Ocean, J. Clim., 29,
4213–4228, https://doi.org/10.1175/JCLI-D-15-0564.1, 2016. a, b
Brümmer, B.: Boundary-layer modification in wintertime cold-air outbreaks
from the Arctic sea ice, Bound.-Lay. Meteorol., 80, 109–125,
https://doi.org/10.1007/BF00119014, 1996. a
Dai, A.: Global precipitation and thunderstorm frequencies. Part II: Diurnal
variations, J. Clim., 14, 1112–1128, 2001. a
Dai, A., Lin, X., and Hsu, K.-L.: The frequency, intensity, and diurnal cycle
of precipitation in surface and satellite observations over low-and
mid-latitudes, Clim. Dynam., 29, 727–744,
https://doi.org/10.1007/s00382-007-0260-y, 2007. a
Diner, D. J., Asner, G. P., Davies, R., Knyazikhin, Y., Muller, J.-P., Nolin,
A. W., Pinty, B., Schaaf, C. B., and Stroeve, J.: New directions in earth
observing: Scientific applications of multiangle remote sensing, Bull. Am. Meteorol. Soc., 80, 2209–2228,
https://doi.org/10.1175/1520-0477(1999)080<2209:NDIEOS>2.0.CO;2, 1999. a
Dong, S., Sprintall, J., and Gille, S. T.: Location of the Antarctic polar
front from AMSR-E satellite sea surface temperature measurements, J.
Phys. Oceanogr., 36, 2075–2089,
https://doi.org/10.1175/JPO2973.1, 2006. a, b, c, d
Field, P., Bodas-Salcedo, A., and Brooks, M.: Using model analysis and
satellite data to assess cloud and precipitation in midlatitude cyclones,
Q. J. Roy. Meteorol. Soc., 137, 1501–1515,
https://doi.org/10.1002/qj.858, 2011. a
Field, P. R., Cotton, R. J., Mcbeath, K., Lock, A. P., Webster, S., and Allan,
R. P.: Improving a convection-permitting model simulation of a cold air
outbreak, Q. J. Roy. Meteorol. Soc., 140,
124–138, https://doi.org/10.1002/qj.2116, 2014. a
Fletcher, J., Mason, S., and Jakob, C.: The climatology, meteorology, and
boundary layer structure of marine cold air outbreaks in both hemispheres,
J. Clim., 29, 1999–2014,
https://doi.org/10.1175/JCLI-D-15-0268.1, 2016a. a
Fletcher, J. K., Mason, S., and Jakob, C.: A climatology of clouds in marine
cold air outbreaks in both hemispheres, J. Clim., 29, 6677–6692,
https://doi.org/10.1175/JCLI-D-15-0783.1, 2016b. a, b, c
Hartmann, D. L. and Short, D. A.: On the use of earth radiation budget
statistics for studies of clouds and climate, J. Atmos.
Sci., 37, 1233–1250,
https://doi.org/10.1175/1520-0469(1980)037<1233:OTUOER>2.0.CO;2, 1980. a
Haynes, J. M., Jakob, C., Rossow, W. B., Tselioudis, G., and Brown, J.: Major
characteristics of Southern Ocean cloud regimes and their effects on the
energy budget, J. Clim., 24, 5061–5080,
https://doi.org/10.1175/2011JCLI4052.1, 2011. a
Hersbach, H., Bell, B., Berrisford, P.,
et al.: The ERA5 global reanalysis, Q. J. Roy.
Meteorol. Soc., 146, 1999–2049,
https://doi.org/10.1002/qj.3803, 2020. a
Hewson, T. D.: Objective fronts, Meteorol. Appl., 5, 37–65,
https://doi.org/10.1017/S1350482798000553, 1998. a
Hoskins, B. J. and Hodges, K. I.: A new perspective on Southern Hemisphere
storm tracks, J. Clim., 18, 4108–4129,
https://doi.org/10.1175/JCLI3570.1, 2005. a
Huang, Y., Chubb, T., Baumgardner, D., deHoog, M., Siems, S. T., and Manton,
M. J.: Evidence for secondary ice production in Southern Ocean open cellular
convection, Q. J. Roy. Meteorol. Soc., 143,
1685–1703, https://doi.org/10.1002/qj.3041, 2017. a, b
Inatsu, M. and Hoskins, B. J.: The zonal asymmetry of the Southern Hemisphere
winter storm track, J. Clim., 17, 4882–4892,
https://doi.org/10.1175/JCLI-3232.1, 2004. a
Japan Meteorological Agency (JMA): Himawari L1 Gridded data, EORC [data set], https://www.eorc.jaxa.jp/ptree/index.html, last access: 25 January 2021. a
Kay, J. E., Wall, C., Yettella, V., Medeiros, B., Hannay, C., Caldwell, P., and
Bitz, C.: Global climate impacts of fixing the Southern Ocean shortwave
radiation bias in the Community Earth System Model (CESM), J.
Clim., 29, 4617–4636, https://doi.org/10.1175/JCLI-D-15-0358.1,
2016. a, b
Kazil, J., Feingold, G., Wang, H., and Yamaguchi, T.: On the interaction
between marine boundary layer cellular cloudiness and surface heat fluxes,
Atmos. Chem. Phys., 14, 61–79,
https://doi.org/10.5194/acp-14-61-2014, 2014. a
Klein, S. A. and Hartmann, D. L.: The seasonal cycle of low stratiform clouds,
J. Clim., 6, 1587–1606,
https://doi.org/10.1175/1520-0442(1993)006<1587:TSCOLS>2.0.CO;2, 1993. a, b, c
Lang, F., Huang, Y., Siems, S. T., and Manton, M. J.: Evidence of a Diurnal
Cycle in Precipitation over the Southern Ocean as Observed at Macquarie
Island, Atmosphere, 11, 181, https://doi.org/10.3390/atmos11020181,
2020. a, b, c
Lang, F., Huang, Y., Protat, A., Truong, S., Siems, S., and Manton, M.: Shallow
Convection and Precipitation Over the Southern Ocean: A Case Study During the
CAPRICORN 2016 Field Campaign, J. Geophys. Res.-Atmos.,
126, e2020JD034088, https://doi.org/10.1029/2020JD034088, 2021. a, b, c
Lim, E.-P. and Simmonds, I.: Southern Hemisphere winter extratropical cyclone
characteristics and vertical organization observed with the ERA-40 data in
1979–2001, J. Clim., 20, 2675–2690,
https://doi.org/10.1175/JCLI4135.1, 2007. a
Mace, G. G. and Zhang, Q.: The CloudSat radar-lidar geometrical profile product
(RL-GeoProf): Updates, improvements, and selected results, J.
Geophys. Res.-Atmos., 119, 9441–9462,
https://doi.org/10.1002/2013JD021374, 2014. a
Mace, G. G., Zhang, Q., Vaughan, M., Marchand, R., Stephens, G., Trepte, C.,
and Winker, D.: A description of hydrometeor layer occurrence statistics
derived from the first year of merged Cloudsat and CALIPSO data, J.
Geophys. Res.-Atmos., 114, D00A26,
https://doi.org/10.1029/2007JD009755, 2009. a, b, c
McCoy, I. L., Wood, R., and Fletcher, J. K.: Identifying Meteorological
Controls on Open and Closed Mesoscale Cellular Convection Associated with
Marine Cold Air Outbreaks, J. Geophys. Res.-Atmos.,
122, 11678–11702, https://doi.org/10.1002/2017JD027031, 2017. a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p
McFarquhar, G. M., Bretherton, C. S., Marchand, R.,
et al.: Observations of clouds, aerosols, precipitation, and surface
radiation over the southern ocean: An overview of CAPRICORN, MARCUS, MICRE,
and SOCRATES, Bull. Am. Meteorol. Soc., 102,
E894–E928, https://doi.org/10.1175/BAMS-D-20-0132.1, 2021. a
Mohrmann, J., Wood, R., Yuan, T., Song, H., Eastman, R., and Oreopoulos, L.:
Identifying meteorological influences on marine low-cloud mesoscale
morphology using satellite classifications, Atmos. Chem.
Phys., 21, 9629–9642, https://doi.org/10.5194/acp-21-9629-2021,
2021. a
Moore, J. K., Abbott, M. R., and Richman, J. G.: Location and dynamics of the
Antarctic Polar Front from satellite sea surface temperature data, J.
Geophys. Res.-Ocean., 104, 3059–3073,
https://doi.org/10.1029/1998JC900032, 1999. a
Murray, R. J. and Simmonds, I.: A numerical scheme for tracking cyclone centres
from digital data, Part I: Development and operation of the scheme,
Austr. Meteorol. Mag., 39, 155–166, 1991. a
Naud, C. M., Booth, J. F., and Del Genio, A. D.: Evaluation of ERA-Interim and
MERRA cloudiness in the Southern Ocean, J. Clim., 27, 2109–2124,
https://doi.org/10.1175/JCLI-D-13-00432.1, 2014. a, b, c, d
Papritz, L., Pfahl, S., Sodemann, H., and Wernli, H.: A climatology of cold air
outbreaks and their impact on air–sea heat fluxes in the high-latitude South
Pacific, J. Clim., 28, 342–364,
https://doi.org/10.1175/JCLI-D-14-00482.1, 2015. a, b
Pezza, A. B., Durrant, T., Simmonds, I., and Smith, I.: Southern Hemisphere
synoptic behavior in extreme phases of SAM, ENSO, sea ice extent, and
southern Australia rainfall, J. Clim., 21, 5566–5584,
https://doi.org/10.1175/2008JCLI2128.1, 2008. a
Platnick, S., King, M. D., Ackerman, S. A., Menzel, W. P., Baum, B. A.,
Riédi, J. C., and Frey, R. A.: The MODIS cloud products: Algorithms and
examples from Terra, IEEE T. Geosci. Remote Sens., 41,
459–473, https://doi.org/10.1109/TGRS.2002.808301, 2003. a
Rozendaal, M. A., Leovy, C. B., and Klein, S. A.: An observational study of
diurnal variations of marine stratiform cloud, J. Clim., 8,
1795–1809,
https://doi.org/10.1175/1520-0442(1995)008<1795:AOSODV>2.0.CO;2, 1995. a
Simmonds, I. and Keay, K.: Mean Southern Hemisphere extratropical cyclone
behavior in the 40-year NCEP–NCAR reanalysis, J. Clim., 13,
873–885,
https://doi.org/10.1175/1520-0442(2000)013<0873:MSHECB>2.0.CO;2, 2000. a, b
Stevens, B., Vali, G., Comstock, K., Wood, R., Van Zanten, M. C., Austin,
P. H., Bretherton, C. S., and Lenschow, D. H.: Pockets of open cells and
drizzle in marine stratocumulus, Bull. Am. Meteorol.
Soc., 86, 51–58, https://doi.org/10.1175/BAMS-86-1-51, 2005. a
Suhre, K., Mari, C., Bates, T. S., Johnson, J. E., Rosset, R., Wang, Q., Bandy,
A. R., Blake, D. R., Businger, S., Eisele, F. L., Huebert, B. J., Kok, G. L.,
Mauldin III, R. L., Prévôt, A. S. H., Schillawski, R. D., Tanner, D. J., and Thornton, D. C.: Physico-chemical
modeling of the First Aerosol Characterization Experiment (ACE 1) Lagrangian B: 1. A moving column approach, J. Geophys. Res.-Atmos.,
103, 16433–16455, 1998. a
Trenberth, K. E. and Fasullo, J. T.: Simulation of present-day and
twenty-first-century energy budgets of the southern oceans, J.
Clim., 23, 440–454, https://doi.org/10.1175/2009JCLI3152.1, 2010. a
Truong, S., Huang, Y., Lang, F., Messmer, M., Simmonds, I., Siems, S., and
Manton, M.: A climatology of the marine atmospheric boundary layer over the
Southern Ocean from four field campaigns during 2016–2018, J.
Geophys. Res.- Atmos., 125, e2020JD033214,
https://doi.org/10.1029/2020JD033214, 2020. a, b, c, d
Vial, J., Vogel, R., Bony, S., Stevens, B., Winker, D. M., Cai, X., Hohenegger,
C., Naumann, A. K., and Brogniez, H.: A new look at the daily cycle of trade
wind cumuli, J. Adv. Model. Earth Syst., 11, 3148–3166,
https://doi.org/10.1029/2019MS001746, 2019. a
Vial, J., Vogel, R., and Schulz, H.: On the daily cycle of mesoscale cloud
organization in the winter trades, Q. J. Roy.
Meteorol. Soc., 47, 2850–2873, https://doi.org/10.1002/qj.4103, 2021. a
Wang, H. and Feingold, G.: Modeling mesoscale cellular structures and drizzle
in marine stratocumulus, Part II: The microphysics and dynamics of the
boundary region between open and closed cells, J. Atmos.
Sci., 66, 3257–3275, https://doi.org/10.1175/2009JAS3120.1, 2009a. a
Wang, H. and Feingold, G.: Modeling mesoscale cellular structures and drizzle
in marine stratocumulus, Part I: Impact of drizzle on the formation and
evolution of open cells, J. Atmos. Sci., 66,
3237–3256, https://doi.org/10.1175/2009JAS3022.1, 2009b. a, b, c
Watson-Parris, D., Sutherland, S., Christensen, M., Eastman, R., and Stier, P.:
A Large-Scale Analysis of Pockets of Open Cells and Their Radiative Impact,
Geophys. Res. Lett., 48, e2020GL092213,
https://doi.org/10.1029/2020GL092213, 2021. a, b, c, d
Williams, K. D., Bodas-Salcedo, A., Déqué, M., Fermepin, S.,
Medeiros, B., Watanabe, M., Jakob, C., Klein, S. A., Senior, C. A., and
Williamson, D. L.: The Transpose-AMIP II experiment and its application to
the understanding of Southern Ocean cloud biases in climate models, J. Clim., 26, 3258–3274, https://doi.org/10.1175/JCLI-D-12-00429.1,
2013.
a, b, c
Wood, R.: Stratocumulus clouds, Month. Weather Rev., 140, 2373–2423,
https://doi.org/10.1175/MWR-D-11-00121.1, 2012. a, b
Wood, R., Bretherton, C. S., Leon, D., Clarke, A. D., Zuidema, P., Allen, G.,
and Coe, H.: An aircraft case study of the spatial transition from closed to
open mesoscale cellular convection over the Southeast Pacific, Atmos.
Chem. Phys., 11, 2341–2370,
https://doi.org/10.5194/acp-11-2341-2011, 2011. a
Yamaguchi, T. and Feingold, G.: On the relationship between open cellular
convective cloud patterns and the spatial distribution of precipitation,
Atmos. Chem. Phys., 15, 1237–1251,
https://doi.org/10.5194/acp-15-1237-2015, 2015. a
Zelinka, M. D., Myers, T. A., McCoy, D. T., Po-Chedley, S., Caldwell, P. M.,
Ceppi, P., Klein, S. A., and Taylor, K. E.: Causes of higher climate
sensitivity in CMIP6 models, Geophys. Res. Lett., 47,
e2019GL085782, https://doi.org/10.1029/2019GL085782, 2020. a
Short summary
Marine low-level clouds cover vast areas of the Southern Ocean, and they are essential to the Earth system energy balance. We use 3 years of satellite observations to group low-level clouds by their spatial structure using a pattern-recognizing program. We studied two primary cloud type patterns, i.e. open and closed clouds. Open clouds are uniformly distributed over the storm track, while closed clouds are most predominant in the southeastern Indian Ocean. Closed clouds exhibit a daily cycle.
Marine low-level clouds cover vast areas of the Southern Ocean, and they are essential to the...
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