Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds
International audience Marine stratocumuli are the most dominant cloud type by area coverage in the Southern Ocean (SO). They can be divided into different self-organized cellular morphological regimes known as open and closed mesoscale-cellular convective (MCC) clouds. Open and closed cells are the...
Published in: | Atmospheric Chemistry and Physics |
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Online Access: | https://insu.hal.science/insu-03779806 https://insu.hal.science/insu-03779806/document https://insu.hal.science/insu-03779806/file/acp-22-10247-2022.pdf https://doi.org/10.5194/acp-22-10247-2022 |
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ftunivlille:oai:HAL:insu-03779806v1 2024-06-23T07:56:57+00:00 Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds Danker, Jessica Sourdeval, Odran Mccoy, Isabel L. Wood, Robert Possner, Anna Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) 2022 https://insu.hal.science/insu-03779806 https://insu.hal.science/insu-03779806/document https://insu.hal.science/insu-03779806/file/acp-22-10247-2022.pdf https://doi.org/10.5194/acp-22-10247-2022 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-22-10247-2022 insu-03779806 https://insu.hal.science/insu-03779806 https://insu.hal.science/insu-03779806/document https://insu.hal.science/insu-03779806/file/acp-22-10247-2022.pdf BIBCODE: 2022ACP.2210247D doi:10.5194/acp-22-10247-2022 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://insu.hal.science/insu-03779806 Atmospheric Chemistry and Physics, 2022, 22, pp.10247-10265. ⟨10.5194/acp-22-10247-2022⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftunivlille https://doi.org/10.5194/acp-22-10247-2022 2024-06-10T14:49:09Z International audience Marine stratocumuli are the most dominant cloud type by area coverage in the Southern Ocean (SO). They can be divided into different self-organized cellular morphological regimes known as open and closed mesoscale-cellular convective (MCC) clouds. Open and closed cells are the two most frequent types of organizational regimes in the SO. Using the liDAR-raDAR (DARDAR) version 2 retrievals, we quantify 59 % of all MCC clouds in this region as mixed-phase clouds (MPCs) during a 4-year time period from 2007 to 2010. The net radiative effect of SO MCC clouds is governed by changes in cloud albedo. Both cloud morphology and phase have previously been shown to impact cloud albedo individually, but their interactions and their combined impact on cloud albedo remain unclear. Here, we investigate the relationships between cloud phase, organizational patterns, and their differences regarding their cloud radiative properties in the SO. The mixed-phase fraction, which is defined as the number of MPCs divided by the sum of MPC and supercooled liquid cloud (SLC) pixels, of all MCC clouds at a given cloud-top temperature (CTT) varies considerably between austral summer and winter. We further find that seasonal changes in cloud phase at a given CTT across all latitudes are largely independent of cloud morphology and are thus seemingly constrained by other external factors. Overall, our results show a stronger dependence of cloud phase on cloud-top height (CTH) than CTT for clouds below 2.5 km in altitude. Preconditioning through ice-phase processes in MPCs has been observed to accelerate individual closed-to-open cell transitions in extratropical stratocumuli. The hypothesis of preconditioning has been further substantiated in large-eddy simulations of open and closed MPCs. In this study, we do not find preconditioning to primarily impact climatological cloud morphology statistics in the SO. Meanwhile, in-cloud albedo analysis reveals stronger changes in open and closed cell albedo in SLCs than in MPCs. ... Article in Journal/Newspaper Southern Ocean LillOA (HAL Lille Open Archive, Université de Lille) Southern Ocean Austral Atmospheric Chemistry and Physics 22 15 10247 10265 |
institution |
Open Polar |
collection |
LillOA (HAL Lille Open Archive, Université de Lille) |
op_collection_id |
ftunivlille |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Danker, Jessica Sourdeval, Odran Mccoy, Isabel L. Wood, Robert Possner, Anna Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Marine stratocumuli are the most dominant cloud type by area coverage in the Southern Ocean (SO). They can be divided into different self-organized cellular morphological regimes known as open and closed mesoscale-cellular convective (MCC) clouds. Open and closed cells are the two most frequent types of organizational regimes in the SO. Using the liDAR-raDAR (DARDAR) version 2 retrievals, we quantify 59 % of all MCC clouds in this region as mixed-phase clouds (MPCs) during a 4-year time period from 2007 to 2010. The net radiative effect of SO MCC clouds is governed by changes in cloud albedo. Both cloud morphology and phase have previously been shown to impact cloud albedo individually, but their interactions and their combined impact on cloud albedo remain unclear. Here, we investigate the relationships between cloud phase, organizational patterns, and their differences regarding their cloud radiative properties in the SO. The mixed-phase fraction, which is defined as the number of MPCs divided by the sum of MPC and supercooled liquid cloud (SLC) pixels, of all MCC clouds at a given cloud-top temperature (CTT) varies considerably between austral summer and winter. We further find that seasonal changes in cloud phase at a given CTT across all latitudes are largely independent of cloud morphology and are thus seemingly constrained by other external factors. Overall, our results show a stronger dependence of cloud phase on cloud-top height (CTH) than CTT for clouds below 2.5 km in altitude. Preconditioning through ice-phase processes in MPCs has been observed to accelerate individual closed-to-open cell transitions in extratropical stratocumuli. The hypothesis of preconditioning has been further substantiated in large-eddy simulations of open and closed MPCs. In this study, we do not find preconditioning to primarily impact climatological cloud morphology statistics in the SO. Meanwhile, in-cloud albedo analysis reveals stronger changes in open and closed cell albedo in SLCs than in MPCs. ... |
author2 |
Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Danker, Jessica Sourdeval, Odran Mccoy, Isabel L. Wood, Robert Possner, Anna |
author_facet |
Danker, Jessica Sourdeval, Odran Mccoy, Isabel L. Wood, Robert Possner, Anna |
author_sort |
Danker, Jessica |
title |
Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds |
title_short |
Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds |
title_full |
Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds |
title_fullStr |
Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds |
title_full_unstemmed |
Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds |
title_sort |
exploring relations between cloud morphology, cloud phase, and cloud radiative properties in southern ocean's stratocumulus clouds |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03779806 https://insu.hal.science/insu-03779806/document https://insu.hal.science/insu-03779806/file/acp-22-10247-2022.pdf https://doi.org/10.5194/acp-22-10247-2022 |
geographic |
Southern Ocean Austral |
geographic_facet |
Southern Ocean Austral |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://insu.hal.science/insu-03779806 Atmospheric Chemistry and Physics, 2022, 22, pp.10247-10265. ⟨10.5194/acp-22-10247-2022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-22-10247-2022 insu-03779806 https://insu.hal.science/insu-03779806 https://insu.hal.science/insu-03779806/document https://insu.hal.science/insu-03779806/file/acp-22-10247-2022.pdf BIBCODE: 2022ACP.2210247D doi:10.5194/acp-22-10247-2022 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-22-10247-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
15 |
container_start_page |
10247 |
op_container_end_page |
10265 |
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