The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation
We explore the change in Southern Ocean upwelling during the last deglaciation, based on proxy records and a transient climate model simulation. Our analyses suggest that, beyond a conventional mechanism of the Southern Hemisphere westerlies shift, Southern Ocean upwelling is strongly influenced by...
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ftmdpi:oai:mdpi.com:/2076-3263/11/7/266/ 2023-08-20T04:01:16+02:00 The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation Wei Liu Zhengyu Liu Shouwei Li agris 2021-06-22 application/pdf https://doi.org/10.3390/geosciences11070266 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/geosciences11070266 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 11; Issue 7; Pages: 266 Southern Ocean upwelling last deglaciation Southern Hemisphere westerlies buoyancy forcing topography Text 2021 ftmdpi https://doi.org/10.3390/geosciences11070266 2023-08-01T02:00:44Z We explore the change in Southern Ocean upwelling during the last deglaciation, based on proxy records and a transient climate model simulation. Our analyses suggest that, beyond a conventional mechanism of the Southern Hemisphere westerlies shift, Southern Ocean upwelling is strongly influenced by surface buoyancy forcing and the local topography. Over the Antarctic Circumpolar Current region, the zonal mean and local upwelled flows exhibited distinct evolution patterns during the last deglaciation, since they are driven by different mechanisms. The zonal mean upwelling is primarily driven by surface wind stress via zonal mean Ekman pumping, whereas local upwelling is driven by both wind and buoyancy forcing, and is tightly coupled to local topography. During the early stage of the last deglaciation, the vertical extension of the upwelled flows increased downstream of submarine ridges but decreased upstream, which led to enhanced and diminished local upwelling, downstream and upstream of the submarine ridges, respectively. Text Antarc* Antarctic Southern Ocean MDPI Open Access Publishing Antarctic Southern Ocean The Antarctic Geosciences 11 7 266 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Southern Ocean upwelling last deglaciation Southern Hemisphere westerlies buoyancy forcing topography |
spellingShingle |
Southern Ocean upwelling last deglaciation Southern Hemisphere westerlies buoyancy forcing topography Wei Liu Zhengyu Liu Shouwei Li The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation |
topic_facet |
Southern Ocean upwelling last deglaciation Southern Hemisphere westerlies buoyancy forcing topography |
description |
We explore the change in Southern Ocean upwelling during the last deglaciation, based on proxy records and a transient climate model simulation. Our analyses suggest that, beyond a conventional mechanism of the Southern Hemisphere westerlies shift, Southern Ocean upwelling is strongly influenced by surface buoyancy forcing and the local topography. Over the Antarctic Circumpolar Current region, the zonal mean and local upwelled flows exhibited distinct evolution patterns during the last deglaciation, since they are driven by different mechanisms. The zonal mean upwelling is primarily driven by surface wind stress via zonal mean Ekman pumping, whereas local upwelling is driven by both wind and buoyancy forcing, and is tightly coupled to local topography. During the early stage of the last deglaciation, the vertical extension of the upwelled flows increased downstream of submarine ridges but decreased upstream, which led to enhanced and diminished local upwelling, downstream and upstream of the submarine ridges, respectively. |
format |
Text |
author |
Wei Liu Zhengyu Liu Shouwei Li |
author_facet |
Wei Liu Zhengyu Liu Shouwei Li |
author_sort |
Wei Liu |
title |
The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation |
title_short |
The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation |
title_full |
The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation |
title_fullStr |
The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation |
title_full_unstemmed |
The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation |
title_sort |
driving mechanisms on southern ocean upwelling change during the last deglaciation |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/geosciences11070266 |
op_coverage |
agris |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Geosciences; Volume 11; Issue 7; Pages: 266 |
op_relation |
https://dx.doi.org/10.3390/geosciences11070266 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences11070266 |
container_title |
Geosciences |
container_volume |
11 |
container_issue |
7 |
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266 |
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1774723933288792064 |