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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2021
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ftdoajarticles:oai:doaj.org/article:31a823ec164e40549d80593e1f15b35b 2023-05-15T13:45:45+02:00 The Driving Mechanisms on Southern Ocean Upwelling Change during the Last Deglaciation Wei Liu Zhengyu Liu Shouwei Li 2021-06-01T00:00:00Z https://doi.org/10.3390/geosciences11070266 https://doaj.org/article/31a823ec164e40549d80593e1f15b35b EN eng MDPI AG https://www.mdpi.com/2076-3263/11/7/266 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences11070266 2076-3263 https://doaj.org/article/31a823ec164e40549d80593e1f15b35b Geosciences, Vol 11, Iss 266, p 266 (2021) Southern Ocean upwelling last deglaciation Southern Hemisphere westerlies buoyancy forcing topography Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.3390/geosciences11070266 2022-12-31T06:36:55Z 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. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean The Antarctic Geosciences 11 7 266 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Southern Ocean upwelling last deglaciation Southern Hemisphere westerlies buoyancy forcing topography Geology QE1-996.5 |
spellingShingle |
Southern Ocean upwelling last deglaciation Southern Hemisphere westerlies buoyancy forcing topography Geology QE1-996.5 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 Geology QE1-996.5 |
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 |
Article in Journal/Newspaper |
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 |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/geosciences11070266 https://doaj.org/article/31a823ec164e40549d80593e1f15b35b |
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, Vol 11, Iss 266, p 266 (2021) |
op_relation |
https://www.mdpi.com/2076-3263/11/7/266 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences11070266 2076-3263 https://doaj.org/article/31a823ec164e40549d80593e1f15b35b |
op_doi |
https://doi.org/10.3390/geosciences11070266 |
container_title |
Geosciences |
container_volume |
11 |
container_issue |
7 |
container_start_page |
266 |
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1766230452272627712 |