Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water
Springtime Arctic mixed-phase convection over open water in the Fram Strait as observed during the recent ACLOUD (Arctic CLoud Observations Using airborne measurements during polar Day) field campaign is simulated at turbulence-resolving resolutions. The first objective is to assess the skill of lar...
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ftcopernicus:oai:publications.copernicus.org:acp98676 2023-06-11T04:09:05+02:00 Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water Chylik, Jan Chechin, Dmitry Dupuy, Regis Kulla, Birte S. Lüpkes, Christof Mertes, Stephan Mech, Mario Neggers, Roel A. J. 2023-04-27 application/pdf https://doi.org/10.5194/acp-23-4903-2023 https://acp.copernicus.org/articles/23/4903/2023/ eng eng doi:10.5194/acp-23-4903-2023 https://acp.copernicus.org/articles/23/4903/2023/ eISSN: 1680-7324 Text 2023 ftcopernicus https://doi.org/10.5194/acp-23-4903-2023 2023-05-01T16:23:11Z Springtime Arctic mixed-phase convection over open water in the Fram Strait as observed during the recent ACLOUD (Arctic CLoud Observations Using airborne measurements during polar Day) field campaign is simulated at turbulence-resolving resolutions. The first objective is to assess the skill of large-eddy simulation (LES) in reproducing the observed mixed-phase convection. The second goal is to then use the model to investigate how aerosol modulates the way in which turbulent mixing and clouds transform the low-level air mass. The focus lies on the low-level thermal structure and lapse rate, the heating efficiency of turbulent entrainment, and the low-level energy budget. A composite case is constructed based on data collected by two research aircraft on 18 June 2017. Simulations are evaluated against independent datasets, showing that the observed thermodynamic, cloudy, and turbulent states are well reproduced. Sensitivity tests on cloud condensation nuclei (CCN) concentration are then performed, covering a broad range between pristine polar and polluted continental values. We find a significant response in the resolved mixed-phase convection, which is in line with previous LES studies. An increased CCN substantially enhances the depth of convection and liquid cloud amount, accompanied by reduced surface precipitation. Initializing with the in situ CCN data yields the best agreement with the cloud and turbulence observations, a result that prioritizes its measurement during field campaigns for supporting high-resolution modeling efforts. A deeper analysis reveals that CCN significantly increases the efficiency of radiatively driven entrainment in warming the boundary layer. The marked strengthening of the thermal inversion plays a key role in this effect. The low-level heat budget shifts from surface driven to radiatively driven. This response is accompanied by a substantial reduction in the surface energy budget, featuring a weakened flow of solar radiation into the ocean. Results are interpreted in the ... Text Arctic Fram Strait Copernicus Publications: E-Journals Arctic Atmospheric Chemistry and Physics 23 8 4903 4929 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Springtime Arctic mixed-phase convection over open water in the Fram Strait as observed during the recent ACLOUD (Arctic CLoud Observations Using airborne measurements during polar Day) field campaign is simulated at turbulence-resolving resolutions. The first objective is to assess the skill of large-eddy simulation (LES) in reproducing the observed mixed-phase convection. The second goal is to then use the model to investigate how aerosol modulates the way in which turbulent mixing and clouds transform the low-level air mass. The focus lies on the low-level thermal structure and lapse rate, the heating efficiency of turbulent entrainment, and the low-level energy budget. A composite case is constructed based on data collected by two research aircraft on 18 June 2017. Simulations are evaluated against independent datasets, showing that the observed thermodynamic, cloudy, and turbulent states are well reproduced. Sensitivity tests on cloud condensation nuclei (CCN) concentration are then performed, covering a broad range between pristine polar and polluted continental values. We find a significant response in the resolved mixed-phase convection, which is in line with previous LES studies. An increased CCN substantially enhances the depth of convection and liquid cloud amount, accompanied by reduced surface precipitation. Initializing with the in situ CCN data yields the best agreement with the cloud and turbulence observations, a result that prioritizes its measurement during field campaigns for supporting high-resolution modeling efforts. A deeper analysis reveals that CCN significantly increases the efficiency of radiatively driven entrainment in warming the boundary layer. The marked strengthening of the thermal inversion plays a key role in this effect. The low-level heat budget shifts from surface driven to radiatively driven. This response is accompanied by a substantial reduction in the surface energy budget, featuring a weakened flow of solar radiation into the ocean. Results are interpreted in the ... |
format |
Text |
author |
Chylik, Jan Chechin, Dmitry Dupuy, Regis Kulla, Birte S. Lüpkes, Christof Mertes, Stephan Mech, Mario Neggers, Roel A. J. |
spellingShingle |
Chylik, Jan Chechin, Dmitry Dupuy, Regis Kulla, Birte S. Lüpkes, Christof Mertes, Stephan Mech, Mario Neggers, Roel A. J. Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water |
author_facet |
Chylik, Jan Chechin, Dmitry Dupuy, Regis Kulla, Birte S. Lüpkes, Christof Mertes, Stephan Mech, Mario Neggers, Roel A. J. |
author_sort |
Chylik, Jan |
title |
Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water |
title_short |
Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water |
title_full |
Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water |
title_fullStr |
Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water |
title_full_unstemmed |
Aerosol impacts on the entrainment efficiency of Arctic mixed-phase convection in a simulated air mass over open water |
title_sort |
aerosol impacts on the entrainment efficiency of arctic mixed-phase convection in a simulated air mass over open water |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-4903-2023 https://acp.copernicus.org/articles/23/4903/2023/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Fram Strait |
genre_facet |
Arctic Fram Strait |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-23-4903-2023 https://acp.copernicus.org/articles/23/4903/2023/ |
op_doi |
https://doi.org/10.5194/acp-23-4903-2023 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
23 |
container_issue |
8 |
container_start_page |
4903 |
op_container_end_page |
4929 |
_version_ |
1768382793659711488 |