Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic
To determine the impact of dynamic and aerosol processes on marine low clouds, we examine the seasonal impact of updraft speed w and cloud condensation nuclei concentration at 0.43 % supersaturation ( NCCN0.43%) on the cloud droplet number concentration (NC) of low-level clouds over the western Nort...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00061679 2023-05-15T17:32:02+02:00 Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic Kirschler, Simon Voigt, Christiane Anderson, Bruce Campos Braga, Ramon Chen, Gao Corral, Andrea F. Crosbie, Ewan Dadashazar, Hossein Ferrare, Richard A. Hahn, Valerian Hendricks, Johannes Kaufmann, Stefan Moore, Richard Pöhlker, Mira L. Robinson, Claire Scarino, Amy J. Schollmayer, Dominik Shook, Michael A. Thornhill, K. Lee Winstead, Edward Ziemba, Luke D. Sorooshian, Armin 2022-06 electronic https://doi.org/10.5194/acp-22-8299-2022 https://noa.gwlb.de/receive/cop_mods_00061679 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061103/acp-22-8299-2022.pdf https://acp.copernicus.org/articles/22/8299/2022/acp-22-8299-2022.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-22-8299-2022 https://noa.gwlb.de/receive/cop_mods_00061679 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061103/acp-22-8299-2022.pdf https://acp.copernicus.org/articles/22/8299/2022/acp-22-8299-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/acp-22-8299-2022 2022-07-03T23:11:41Z To determine the impact of dynamic and aerosol processes on marine low clouds, we examine the seasonal impact of updraft speed w and cloud condensation nuclei concentration at 0.43 % supersaturation ( NCCN0.43%) on the cloud droplet number concentration (NC) of low-level clouds over the western North Atlantic Ocean. Aerosol and cloud properties were measured with instruments on board the NASA LaRC Falcon HU-25 during the ACTIVATE (Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment) mission in summer (August) and winter (February–March) 2020. The data are grouped into different NCCN0.43% loadings, and the density functions of NC and w near the cloud bases are compared. For low updrafts (w < 1.3 m s−1), NC in winter is mainly limited by the updraft speed and in summer additionally by aerosols. At larger updrafts (w > 3 m s−1), NC is impacted by the aerosol population, while at clean marine conditions cloud nucleation is aerosol-limited, and for high NCCN0.43% it is influenced by aerosols and updraft. The aerosol size distribution in winter shows a bimodal distribution in clean marine environments, which transforms to a unimodal distribution in high NCCN0.43% due to chemical and physical aerosol processes, whereas unimodal distributions prevail in summer, with a significant difference in their aerosol concentration and composition. The increase of NCCN0.43% is accompanied with an increase of organic aerosol and sulfate compounds in both seasons. We demonstrate that NC can be explained by cloud condensation nuclei activation through upwards processed air masses with varying fractions of activated aerosols. The activation highly depends on w and thus supersaturation between the different seasons, while the aerosol size distribution additionally affects NC within a season. Our results quantify the seasonal influence of w and NCCN0.43% on NC and can be used to improve the representation of low marine clouds in models. Article in Journal/Newspaper North Atlantic Niedersächsisches Online-Archiv NOA Atmospheric Chemistry and Physics 22 12 8299 8319 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Kirschler, Simon Voigt, Christiane Anderson, Bruce Campos Braga, Ramon Chen, Gao Corral, Andrea F. Crosbie, Ewan Dadashazar, Hossein Ferrare, Richard A. Hahn, Valerian Hendricks, Johannes Kaufmann, Stefan Moore, Richard Pöhlker, Mira L. Robinson, Claire Scarino, Amy J. Schollmayer, Dominik Shook, Michael A. Thornhill, K. Lee Winstead, Edward Ziemba, Luke D. Sorooshian, Armin Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic |
topic_facet |
article Verlagsveröffentlichung |
description |
To determine the impact of dynamic and aerosol processes on marine low clouds, we examine the seasonal impact of updraft speed w and cloud condensation nuclei concentration at 0.43 % supersaturation ( NCCN0.43%) on the cloud droplet number concentration (NC) of low-level clouds over the western North Atlantic Ocean. Aerosol and cloud properties were measured with instruments on board the NASA LaRC Falcon HU-25 during the ACTIVATE (Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment) mission in summer (August) and winter (February–March) 2020. The data are grouped into different NCCN0.43% loadings, and the density functions of NC and w near the cloud bases are compared. For low updrafts (w < 1.3 m s−1), NC in winter is mainly limited by the updraft speed and in summer additionally by aerosols. At larger updrafts (w > 3 m s−1), NC is impacted by the aerosol population, while at clean marine conditions cloud nucleation is aerosol-limited, and for high NCCN0.43% it is influenced by aerosols and updraft. The aerosol size distribution in winter shows a bimodal distribution in clean marine environments, which transforms to a unimodal distribution in high NCCN0.43% due to chemical and physical aerosol processes, whereas unimodal distributions prevail in summer, with a significant difference in their aerosol concentration and composition. The increase of NCCN0.43% is accompanied with an increase of organic aerosol and sulfate compounds in both seasons. We demonstrate that NC can be explained by cloud condensation nuclei activation through upwards processed air masses with varying fractions of activated aerosols. The activation highly depends on w and thus supersaturation between the different seasons, while the aerosol size distribution additionally affects NC within a season. Our results quantify the seasonal influence of w and NCCN0.43% on NC and can be used to improve the representation of low marine clouds in models. |
format |
Article in Journal/Newspaper |
author |
Kirschler, Simon Voigt, Christiane Anderson, Bruce Campos Braga, Ramon Chen, Gao Corral, Andrea F. Crosbie, Ewan Dadashazar, Hossein Ferrare, Richard A. Hahn, Valerian Hendricks, Johannes Kaufmann, Stefan Moore, Richard Pöhlker, Mira L. Robinson, Claire Scarino, Amy J. Schollmayer, Dominik Shook, Michael A. Thornhill, K. Lee Winstead, Edward Ziemba, Luke D. Sorooshian, Armin |
author_facet |
Kirschler, Simon Voigt, Christiane Anderson, Bruce Campos Braga, Ramon Chen, Gao Corral, Andrea F. Crosbie, Ewan Dadashazar, Hossein Ferrare, Richard A. Hahn, Valerian Hendricks, Johannes Kaufmann, Stefan Moore, Richard Pöhlker, Mira L. Robinson, Claire Scarino, Amy J. Schollmayer, Dominik Shook, Michael A. Thornhill, K. Lee Winstead, Edward Ziemba, Luke D. Sorooshian, Armin |
author_sort |
Kirschler, Simon |
title |
Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic |
title_short |
Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic |
title_full |
Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic |
title_fullStr |
Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic |
title_full_unstemmed |
Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic |
title_sort |
seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western north atlantic |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-8299-2022 https://noa.gwlb.de/receive/cop_mods_00061679 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061103/acp-22-8299-2022.pdf https://acp.copernicus.org/articles/22/8299/2022/acp-22-8299-2022.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-22-8299-2022 https://noa.gwlb.de/receive/cop_mods_00061679 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061103/acp-22-8299-2022.pdf https://acp.copernicus.org/articles/22/8299/2022/acp-22-8299-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/acp-22-8299-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
12 |
container_start_page |
8299 |
op_container_end_page |
8319 |
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1766129965553680384 |