Observed impact of meso-scale vertical motion on cloudiness
International audience Abstract We use estimates of meso-scale vertical velocity and co-located cloud measurements from the second Next-Generation Aircraft Remote Sensing for Validation campaign (NARVAL2) in the tropical North Atlantic to show the observed impact of meso-scale vertical motion on tro...
Published in: | Journal of the Atmospheric Sciences |
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Format: | Article in Journal/Newspaper |
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2021
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Online Access: | https://hal.sorbonne-universite.fr/hal-03440242 https://hal.sorbonne-universite.fr/hal-03440242/document https://hal.sorbonne-universite.fr/hal-03440242/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Observed%20Impact%20of%20Mesoscale%20Vertical%20Motion%20on%20Cloudiness.pdf https://doi.org/10.1175/JAS-D-20-0335.1 |
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ftinspolytechpar:oai:HAL:hal-03440242v1 2024-06-16T07:41:51+00:00 Observed impact of meso-scale vertical motion on cloudiness George, Geet Stevens, Bjorn Bony, Sandrine Klingebiel, Marcus Vogel, Raphaela Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) 2021-05-17 https://hal.sorbonne-universite.fr/hal-03440242 https://hal.sorbonne-universite.fr/hal-03440242/document https://hal.sorbonne-universite.fr/hal-03440242/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Observed%20Impact%20of%20Mesoscale%20Vertical%20Motion%20on%20Cloudiness.pdf https://doi.org/10.1175/JAS-D-20-0335.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-20-0335.1 hal-03440242 https://hal.sorbonne-universite.fr/hal-03440242 https://hal.sorbonne-universite.fr/hal-03440242/document https://hal.sorbonne-universite.fr/hal-03440242/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Observed%20Impact%20of%20Mesoscale%20Vertical%20Motion%20on%20Cloudiness.pdf doi:10.1175/JAS-D-20-0335.1 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.sorbonne-universite.fr/hal-03440242 Journal of the Atmospheric Sciences, 2021, ⟨10.1175/JAS-D-20-0335.1⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2021 ftinspolytechpar https://doi.org/10.1175/JAS-D-20-0335.1 2024-05-19T23:43:45Z International audience Abstract We use estimates of meso-scale vertical velocity and co-located cloud measurements from the second Next-Generation Aircraft Remote Sensing for Validation campaign (NARVAL2) in the tropical North Atlantic to show the observed impact of meso-scale vertical motion on tropical clouds. Our results not only confirm previously untested hypotheses about the role of dynamics being non-negligible in determining cloudiness, but go further to show that at the meso-scale, the dynamics has a more dominant control on cloudiness variability than thermodynamics. A simple mass-flux estimate reveals that meso-scale vertical velocity at the sub-cloud layer top explains much of the variations in peak shallow cumulus cloud fraction. In contrast, we find that thermodynamic cloud-controlling factors, such as humidity and stability, are unable to explain the variations in cloudiness at the meso-scale. Thus, capturing the observed variability of cloudiness may require not only a consideration of thermodynamic factors, but also dynamic ones such as the meso-scale vertical velocity. Article in Journal/Newspaper North Atlantic HAL de l'Institut Polytechnique de Paris Journal of the Atmospheric Sciences |
institution |
Open Polar |
collection |
HAL de l'Institut Polytechnique de Paris |
op_collection_id |
ftinspolytechpar |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere George, Geet Stevens, Bjorn Bony, Sandrine Klingebiel, Marcus Vogel, Raphaela Observed impact of meso-scale vertical motion on cloudiness |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Abstract We use estimates of meso-scale vertical velocity and co-located cloud measurements from the second Next-Generation Aircraft Remote Sensing for Validation campaign (NARVAL2) in the tropical North Atlantic to show the observed impact of meso-scale vertical motion on tropical clouds. Our results not only confirm previously untested hypotheses about the role of dynamics being non-negligible in determining cloudiness, but go further to show that at the meso-scale, the dynamics has a more dominant control on cloudiness variability than thermodynamics. A simple mass-flux estimate reveals that meso-scale vertical velocity at the sub-cloud layer top explains much of the variations in peak shallow cumulus cloud fraction. In contrast, we find that thermodynamic cloud-controlling factors, such as humidity and stability, are unable to explain the variations in cloudiness at the meso-scale. Thus, capturing the observed variability of cloudiness may require not only a consideration of thermodynamic factors, but also dynamic ones such as the meso-scale vertical velocity. |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
George, Geet Stevens, Bjorn Bony, Sandrine Klingebiel, Marcus Vogel, Raphaela |
author_facet |
George, Geet Stevens, Bjorn Bony, Sandrine Klingebiel, Marcus Vogel, Raphaela |
author_sort |
George, Geet |
title |
Observed impact of meso-scale vertical motion on cloudiness |
title_short |
Observed impact of meso-scale vertical motion on cloudiness |
title_full |
Observed impact of meso-scale vertical motion on cloudiness |
title_fullStr |
Observed impact of meso-scale vertical motion on cloudiness |
title_full_unstemmed |
Observed impact of meso-scale vertical motion on cloudiness |
title_sort |
observed impact of meso-scale vertical motion on cloudiness |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.sorbonne-universite.fr/hal-03440242 https://hal.sorbonne-universite.fr/hal-03440242/document https://hal.sorbonne-universite.fr/hal-03440242/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Observed%20Impact%20of%20Mesoscale%20Vertical%20Motion%20on%20Cloudiness.pdf https://doi.org/10.1175/JAS-D-20-0335.1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.sorbonne-universite.fr/hal-03440242 Journal of the Atmospheric Sciences, 2021, ⟨10.1175/JAS-D-20-0335.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-20-0335.1 hal-03440242 https://hal.sorbonne-universite.fr/hal-03440242 https://hal.sorbonne-universite.fr/hal-03440242/document https://hal.sorbonne-universite.fr/hal-03440242/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Observed%20Impact%20of%20Mesoscale%20Vertical%20Motion%20on%20Cloudiness.pdf doi:10.1175/JAS-D-20-0335.1 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JAS-D-20-0335.1 |
container_title |
Journal of the Atmospheric Sciences |
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1802009157175345152 |