Cloud and boundary layer interactions over the Arctic sea ice in late summer
Observations from the Arctic Summer Cloud Ocean Study (ASCOS), in the central Arctic sea-ice pack in late summer 2008, provide a detailed view of cloud–atmosphere–surface interactions and vertical mixing processes over the sea-ice environment. Measurements from a suite of ground-based remote sensors...
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ftdoajarticles:oai:doaj.org/article:ae0edfee3b594bee87da45a553127ccb 2023-05-15T14:29:20+02:00 Cloud and boundary layer interactions over the Arctic sea ice in late summer M. D. Shupe P. O. G. Persson I. M. Brooks M. Tjernström J. Sedlar T. Mauritsen S. Sjogren C. Leck 2013-09-01T00:00:00Z https://doi.org/10.5194/acp-13-9379-2013 https://doaj.org/article/ae0edfee3b594bee87da45a553127ccb EN eng Copernicus Publications http://www.atmos-chem-phys.net/13/9379/2013/acp-13-9379-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-9379-2013 1680-7316 1680-7324 https://doaj.org/article/ae0edfee3b594bee87da45a553127ccb Atmospheric Chemistry and Physics, Vol 13, Iss 18, Pp 9379-9399 (2013) Physics QC1-999 Chemistry QD1-999 article 2013 ftdoajarticles https://doi.org/10.5194/acp-13-9379-2013 2022-12-31T13:20:52Z Observations from the Arctic Summer Cloud Ocean Study (ASCOS), in the central Arctic sea-ice pack in late summer 2008, provide a detailed view of cloud–atmosphere–surface interactions and vertical mixing processes over the sea-ice environment. Measurements from a suite of ground-based remote sensors, near-surface meteorological and aerosol instruments, and profiles from radiosondes and a helicopter are combined to characterize a week-long period dominated by low-level, mixed-phase, stratocumulus clouds. Detailed case studies and statistical analyses are used to develop a conceptual model for the cloud and atmosphere structure and their interactions in this environment. Clouds were persistent during the period of study, having qualities that suggest they were sustained through a combination of advective influences and in-cloud processes, with little contribution from the surface. Radiative cooling near cloud top produced buoyancy-driven, turbulent eddies that contributed to cloud formation and created a cloud-driven mixed layer. The depth of this mixed layer was related to the amount of turbulence and condensed cloud water. Coupling of this cloud-driven mixed layer to the surface boundary layer was primarily determined by proximity. For 75% of the period of study, the primary stratocumulus cloud-driven mixed layer was decoupled from the surface and typically at a warmer potential temperature. Since the near-surface temperature was constrained by the ocean–ice mixture, warm temperatures aloft suggest that these air masses had not significantly interacted with the sea-ice surface. Instead, back-trajectory analyses suggest that these warm air masses advected into the central Arctic Basin from lower latitudes. Moisture and aerosol particles likely accompanied these air masses, providing necessary support for cloud formation. On the occasions when cloud–surface coupling did occur, back trajectories indicated that these air masses advected at low levels, while mixing processes kept the mixed layer in equilibrium with ... Article in Journal/Newspaper Arctic Basin Arctic ice pack Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 13 18 9379 9399 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 M. D. Shupe P. O. G. Persson I. M. Brooks M. Tjernström J. Sedlar T. Mauritsen S. Sjogren C. Leck Cloud and boundary layer interactions over the Arctic sea ice in late summer |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Observations from the Arctic Summer Cloud Ocean Study (ASCOS), in the central Arctic sea-ice pack in late summer 2008, provide a detailed view of cloud–atmosphere–surface interactions and vertical mixing processes over the sea-ice environment. Measurements from a suite of ground-based remote sensors, near-surface meteorological and aerosol instruments, and profiles from radiosondes and a helicopter are combined to characterize a week-long period dominated by low-level, mixed-phase, stratocumulus clouds. Detailed case studies and statistical analyses are used to develop a conceptual model for the cloud and atmosphere structure and their interactions in this environment. Clouds were persistent during the period of study, having qualities that suggest they were sustained through a combination of advective influences and in-cloud processes, with little contribution from the surface. Radiative cooling near cloud top produced buoyancy-driven, turbulent eddies that contributed to cloud formation and created a cloud-driven mixed layer. The depth of this mixed layer was related to the amount of turbulence and condensed cloud water. Coupling of this cloud-driven mixed layer to the surface boundary layer was primarily determined by proximity. For 75% of the period of study, the primary stratocumulus cloud-driven mixed layer was decoupled from the surface and typically at a warmer potential temperature. Since the near-surface temperature was constrained by the ocean–ice mixture, warm temperatures aloft suggest that these air masses had not significantly interacted with the sea-ice surface. Instead, back-trajectory analyses suggest that these warm air masses advected into the central Arctic Basin from lower latitudes. Moisture and aerosol particles likely accompanied these air masses, providing necessary support for cloud formation. On the occasions when cloud–surface coupling did occur, back trajectories indicated that these air masses advected at low levels, while mixing processes kept the mixed layer in equilibrium with ... |
format |
Article in Journal/Newspaper |
author |
M. D. Shupe P. O. G. Persson I. M. Brooks M. Tjernström J. Sedlar T. Mauritsen S. Sjogren C. Leck |
author_facet |
M. D. Shupe P. O. G. Persson I. M. Brooks M. Tjernström J. Sedlar T. Mauritsen S. Sjogren C. Leck |
author_sort |
M. D. Shupe |
title |
Cloud and boundary layer interactions over the Arctic sea ice in late summer |
title_short |
Cloud and boundary layer interactions over the Arctic sea ice in late summer |
title_full |
Cloud and boundary layer interactions over the Arctic sea ice in late summer |
title_fullStr |
Cloud and boundary layer interactions over the Arctic sea ice in late summer |
title_full_unstemmed |
Cloud and boundary layer interactions over the Arctic sea ice in late summer |
title_sort |
cloud and boundary layer interactions over the arctic sea ice in late summer |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/acp-13-9379-2013 https://doaj.org/article/ae0edfee3b594bee87da45a553127ccb |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Basin Arctic ice pack Sea ice |
genre_facet |
Arctic Basin Arctic ice pack Sea ice |
op_source |
Atmospheric Chemistry and Physics, Vol 13, Iss 18, Pp 9379-9399 (2013) |
op_relation |
http://www.atmos-chem-phys.net/13/9379/2013/acp-13-9379-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-9379-2013 1680-7316 1680-7324 https://doaj.org/article/ae0edfee3b594bee87da45a553127ccb |
op_doi |
https://doi.org/10.5194/acp-13-9379-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
18 |
container_start_page |
9379 |
op_container_end_page |
9399 |
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1766303369489547264 |