Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice
We infer circumpolar maps of stress imparted to the ocean by the wind, mediated by sea-ice, in and around the Seasonal Ice Zone (SIZ) of Antarctica. In the open ocean we compute the wind stress using surface winds from daily atmospheric reanalyses and applying bulk formulae. In the presence of sea i...
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Online Access: | http://dx.doi.org/10.3389/fmars.2022.864808 https://www.frontiersin.org/articles/10.3389/fmars.2022.864808/full |
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crfrontiers:10.3389/fmars.2022.864808 2024-02-11T09:58:56+01:00 Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice Ramadhan, Ali Marshall, John Meneghello, Gianluca Illari, Lodovica Speer, Kevin 2022 http://dx.doi.org/10.3389/fmars.2022.864808 https://www.frontiersin.org/articles/10.3389/fmars.2022.864808/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 9 ISSN 2296-7745 Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography journal-article 2022 crfrontiers https://doi.org/10.3389/fmars.2022.864808 2024-01-26T09:58:03Z We infer circumpolar maps of stress imparted to the ocean by the wind, mediated by sea-ice, in and around the Seasonal Ice Zone (SIZ) of Antarctica. In the open ocean we compute the wind stress using surface winds from daily atmospheric reanalyses and applying bulk formulae. In the presence of sea ice, the stress imparted to the underlying ocean is computed from satellite observations of daily ice concentration and drift velocity assuming, first, that the ocean geostrophic currents beneath are negligible, and then including surface geostrophic ocean currents inferred from satellite altimetry. In this way maps of surface ocean stress in the SIZ are obtained. The maps are discussed and interpreted, and their importance in setting the circulation emphasised. Just as in parallel observational studies in the Arctic, we find that ocean currents significantly modify the stress field, the sense of the surface ageostrophic flow and thus pathways of exchange across the SIZ. Maps of Ekman pumping reveal broad patterns of upwelling within the SIZ enhanced near the sea ice edge, which are offset by strong narrow downwelling regions adjacent to the Antarctic continent. Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic Sea ice Frontiers (Publisher) Arctic Antarctic The Antarctic Frontiers in Marine Science 9 |
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Open Polar |
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Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
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Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography Ramadhan, Ali Marshall, John Meneghello, Gianluca Illari, Lodovica Speer, Kevin Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice |
topic_facet |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
description |
We infer circumpolar maps of stress imparted to the ocean by the wind, mediated by sea-ice, in and around the Seasonal Ice Zone (SIZ) of Antarctica. In the open ocean we compute the wind stress using surface winds from daily atmospheric reanalyses and applying bulk formulae. In the presence of sea ice, the stress imparted to the underlying ocean is computed from satellite observations of daily ice concentration and drift velocity assuming, first, that the ocean geostrophic currents beneath are negligible, and then including surface geostrophic ocean currents inferred from satellite altimetry. In this way maps of surface ocean stress in the SIZ are obtained. The maps are discussed and interpreted, and their importance in setting the circulation emphasised. Just as in parallel observational studies in the Arctic, we find that ocean currents significantly modify the stress field, the sense of the surface ageostrophic flow and thus pathways of exchange across the SIZ. Maps of Ekman pumping reveal broad patterns of upwelling within the SIZ enhanced near the sea ice edge, which are offset by strong narrow downwelling regions adjacent to the Antarctic continent. |
format |
Article in Journal/Newspaper |
author |
Ramadhan, Ali Marshall, John Meneghello, Gianluca Illari, Lodovica Speer, Kevin |
author_facet |
Ramadhan, Ali Marshall, John Meneghello, Gianluca Illari, Lodovica Speer, Kevin |
author_sort |
Ramadhan, Ali |
title |
Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice |
title_short |
Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice |
title_full |
Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice |
title_fullStr |
Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice |
title_full_unstemmed |
Observations of Upwelling and Downwelling Around Antarctica Mediated by Sea Ice |
title_sort |
observations of upwelling and downwelling around antarctica mediated by sea ice |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/fmars.2022.864808 https://www.frontiersin.org/articles/10.3389/fmars.2022.864808/full |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Arctic Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Arctic Sea ice |
op_source |
Frontiers in Marine Science volume 9 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2022.864808 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1790594762590388224 |