Formation and Conservation of a polynya in the Weddell Sea
A dynamic–thermodynamic sea ice–mixed layer model for the Weddell Sea is complemented by a simple, diagnostic model to account for local sea ice–atmosphere interaction. To consider the atmospheric influence on the oceanic mixed layer, the pycnocline upwelling velocity is calculated using the theory...
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1999
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ftoceanrep:oai:oceanrep.geomar.de:5401 2023-05-15T18:17:20+02:00 Formation and Conservation of a polynya in the Weddell Sea Timmermann, R. Lemke, Peter Kottmeier, C. 1999 text https://oceanrep.geomar.de/id/eprint/5401/ https://oceanrep.geomar.de/id/eprint/5401/1/1520-0485%281999%29029_1251_famoap_2.0.co%3B2.pdf https://doi.org/10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 en eng AMS (American Meteorological Society) https://oceanrep.geomar.de/id/eprint/5401/1/1520-0485%281999%29029_1251_famoap_2.0.co%3B2.pdf Timmermann, R., Lemke, P. and Kottmeier, C. (1999) Formation and Conservation of a polynya in the Weddell Sea. Open Access Journal of Physical Oceanography, 29 (6). pp. 1251-1264. DOI 10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 <https://doi.org/10.1175/1520-0485%281999%29029%3C1251%3AFAMOAP%3E2.0.CO%3B2>. doi:10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 info:eu-repo/semantics/openAccess Article PeerReviewed 1999 ftoceanrep https://doi.org/10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 2023-04-07T14:51:03Z A dynamic–thermodynamic sea ice–mixed layer model for the Weddell Sea is complemented by a simple, diagnostic model to account for local sea ice–atmosphere interaction. To consider the atmospheric influence on the oceanic mixed layer, the pycnocline upwelling velocity is calculated using the theory of Ekman pumping. In several experiments, formation and conservation of a polynya in the Weddell Sea are investigated. Intrusion of heat into the lower atmosphere above the polynya area is assumed to cause a thermal perturbation and a cyclonic thermal wind field. Superposed with daily ECMWF surface winds, this modified atmospheric forcing field intensifies oceanic upwelling and induces divergent ice drift. Simulation results indicate that in case of a weak atmospheric cross-polynya flow the formation of a thermal wind field can significantly extend the lifetime of a large polynya. The repeated occurrence of the Weddell polynya in the years 1974–76 thus appears to be an effect of feedback mechanisms between sea ice, atmosphere, and oceanic mixed layer. Article in Journal/Newspaper Sea ice Weddell Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Weddell Weddell Sea |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
A dynamic–thermodynamic sea ice–mixed layer model for the Weddell Sea is complemented by a simple, diagnostic model to account for local sea ice–atmosphere interaction. To consider the atmospheric influence on the oceanic mixed layer, the pycnocline upwelling velocity is calculated using the theory of Ekman pumping. In several experiments, formation and conservation of a polynya in the Weddell Sea are investigated. Intrusion of heat into the lower atmosphere above the polynya area is assumed to cause a thermal perturbation and a cyclonic thermal wind field. Superposed with daily ECMWF surface winds, this modified atmospheric forcing field intensifies oceanic upwelling and induces divergent ice drift. Simulation results indicate that in case of a weak atmospheric cross-polynya flow the formation of a thermal wind field can significantly extend the lifetime of a large polynya. The repeated occurrence of the Weddell polynya in the years 1974–76 thus appears to be an effect of feedback mechanisms between sea ice, atmosphere, and oceanic mixed layer. |
format |
Article in Journal/Newspaper |
author |
Timmermann, R. Lemke, Peter Kottmeier, C. |
spellingShingle |
Timmermann, R. Lemke, Peter Kottmeier, C. Formation and Conservation of a polynya in the Weddell Sea |
author_facet |
Timmermann, R. Lemke, Peter Kottmeier, C. |
author_sort |
Timmermann, R. |
title |
Formation and Conservation of a polynya in the Weddell Sea |
title_short |
Formation and Conservation of a polynya in the Weddell Sea |
title_full |
Formation and Conservation of a polynya in the Weddell Sea |
title_fullStr |
Formation and Conservation of a polynya in the Weddell Sea |
title_full_unstemmed |
Formation and Conservation of a polynya in the Weddell Sea |
title_sort |
formation and conservation of a polynya in the weddell sea |
publisher |
AMS (American Meteorological Society) |
publishDate |
1999 |
url |
https://oceanrep.geomar.de/id/eprint/5401/ https://oceanrep.geomar.de/id/eprint/5401/1/1520-0485%281999%29029_1251_famoap_2.0.co%3B2.pdf https://doi.org/10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Sea ice Weddell Sea |
genre_facet |
Sea ice Weddell Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/5401/1/1520-0485%281999%29029_1251_famoap_2.0.co%3B2.pdf Timmermann, R., Lemke, P. and Kottmeier, C. (1999) Formation and Conservation of a polynya in the Weddell Sea. Open Access Journal of Physical Oceanography, 29 (6). pp. 1251-1264. DOI 10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 <https://doi.org/10.1175/1520-0485%281999%29029%3C1251%3AFAMOAP%3E2.0.CO%3B2>. doi:10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2 |
_version_ |
1766191481994870784 |