Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water
Late springtime Arctic mixed-phase convective clouds over open water in the Fram Strait as observed during the recent ACLOUD field campaign are simulated at turbulence-resolving resolutions. The main research objective is to gain more insight into the coupling of these cloud layers to the surface, a...
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ftcopernicus:oai:publications.copernicus.org:acpd98676 2023-05-15T15:00:02+02:00 Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water Chylik, Jan Chechin, Dmitry Dupuy, Regis Kulla, Birte S. Lüpkes, Christof Mertes, Stephan Mech, Mario Neggers, Roel A. J. 2021-11-05 application/pdf https://doi.org/10.5194/acp-2021-888 https://acp.copernicus.org/preprints/acp-2021-888/ eng eng doi:10.5194/acp-2021-888 https://acp.copernicus.org/preprints/acp-2021-888/ eISSN: 1680-7324 Text 2021 ftcopernicus https://doi.org/10.5194/acp-2021-888 2021-11-08T17:22:29Z Late springtime Arctic mixed-phase convective clouds over open water in the Fram Strait as observed during the recent ACLOUD field campaign are simulated at turbulence-resolving resolutions. The main research objective is to gain more insight into the coupling of these cloud layers to the surface, and into the role played by interactions between aerosol, hydrometeors and turbulence in this process. A composite case is constructed based on data collected by two research aircraft on 18 June 2017. The boundary conditions and large-scale forcings are based on weather model analyses, yielding a simulation that freely equilibrates towards the observed thermodynamic state. The results are evaluated against a variety of independent aircraft measurements. The observed cloud macro- and microphysical structure is well reproduced, consisting of a stratiform cloud layer in mixed-phase fed by surface-driven convective transport in predominantly liquid phase. Comparison to noseboom turbulence measurements suggests that the simulated cloud-surface coupling is realistic. A joint-pdf analysis of relevant state variables is conducted, suggesting that locations where the mixed-phase cloud layer is strongly coupled to the surface by convective updrafts act as hot-spots for invigorated interactions between turbulence, clouds and aerosol. A mixing-line analysis reveals that the turbulent mixing is similar to warm convective cloud regimes, but is accompanied by hydrometeor transitions that are unique for mixed-phase cloud systems. Distinct fingerprints in the joint-pdf diagrams also explain i) the typical ring-like shape of ice mass in the outflow cloud deck, ii) its slightly elevated buoyancy, and iii) an associated local minimum in CCN. Text Arctic Fram Strait Copernicus Publications: E-Journals Arctic |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Late springtime Arctic mixed-phase convective clouds over open water in the Fram Strait as observed during the recent ACLOUD field campaign are simulated at turbulence-resolving resolutions. The main research objective is to gain more insight into the coupling of these cloud layers to the surface, and into the role played by interactions between aerosol, hydrometeors and turbulence in this process. A composite case is constructed based on data collected by two research aircraft on 18 June 2017. The boundary conditions and large-scale forcings are based on weather model analyses, yielding a simulation that freely equilibrates towards the observed thermodynamic state. The results are evaluated against a variety of independent aircraft measurements. The observed cloud macro- and microphysical structure is well reproduced, consisting of a stratiform cloud layer in mixed-phase fed by surface-driven convective transport in predominantly liquid phase. Comparison to noseboom turbulence measurements suggests that the simulated cloud-surface coupling is realistic. A joint-pdf analysis of relevant state variables is conducted, suggesting that locations where the mixed-phase cloud layer is strongly coupled to the surface by convective updrafts act as hot-spots for invigorated interactions between turbulence, clouds and aerosol. A mixing-line analysis reveals that the turbulent mixing is similar to warm convective cloud regimes, but is accompanied by hydrometeor transitions that are unique for mixed-phase cloud systems. Distinct fingerprints in the joint-pdf diagrams also explain i) the typical ring-like shape of ice mass in the outflow cloud deck, ii) its slightly elevated buoyancy, and iii) an associated local minimum in CCN. |
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-cloud-turbulence interactions in well-coupled Arctic boundary layers 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-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water |
title_short |
Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water |
title_full |
Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water |
title_fullStr |
Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water |
title_full_unstemmed |
Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water |
title_sort |
aerosol-cloud-turbulence interactions in well-coupled arctic boundary layers over open water |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-2021-888 https://acp.copernicus.org/preprints/acp-2021-888/ |
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-2021-888 https://acp.copernicus.org/preprints/acp-2021-888/ |
op_doi |
https://doi.org/10.5194/acp-2021-888 |
_version_ |
1766332136240971776 |