Exchange across the shelf break at high southern latitudes
Exchange of water across the Antarctic shelf break has considerable scientific and societal importance due to its effects on circulation and biology of the region, conversion of water masses as part of the global overturning circulation and basal melt of glacial ice and the consequent effect on sea...
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ftdoajarticles:oai:doaj.org/article:aaf45ac6707a4407bb6658bf20210fb5 2023-05-15T13:51:08+02:00 Exchange across the shelf break at high southern latitudes J. M. Klinck M. S. Dinniman 2010-05-01T00:00:00Z https://doi.org/10.5194/os-6-513-2010 https://doaj.org/article/aaf45ac6707a4407bb6658bf20210fb5 EN eng Copernicus Publications http://www.ocean-sci.net/6/513/2010/os-6-513-2010.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-6-513-2010 1812-0784 1812-0792 https://doaj.org/article/aaf45ac6707a4407bb6658bf20210fb5 Ocean Science, Vol 6, Iss 2, Pp 513-524 (2010) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2010 ftdoajarticles https://doi.org/10.5194/os-6-513-2010 2022-12-31T04:21:50Z Exchange of water across the Antarctic shelf break has considerable scientific and societal importance due to its effects on circulation and biology of the region, conversion of water masses as part of the global overturning circulation and basal melt of glacial ice and the consequent effect on sea level rise. The focus in this paper is the onshore transport of warm, oceanic Circumpolar Deep Water (CDW); export of dense water from these shelves is equally important, but has been the focus of other recent papers and will not be considered here. A variety of physical mechanisms are described which could play a role in this onshore flux. The relative importance of some processes are evaluated by simple calculations. A numerical model for the Ross Sea continental shelf is used as an example of a more comprehensive evaluation of the details of cross-shelf break exchange. In order for an ocean circulation model to simulate these processes at high southern latitudes, it needs to have high spatial resolution, realistic geometry and bathymetry. Grid spacing smaller than the first baroclinic radius of deformation (a few km) is required to adequately represent the circulation. Because of flow-topography interactions, bathymetry needs to be represented at these same small scales. Atmospheric conditions used to force these circulation models also need to be known at a similar small spatial resolution (a few km) in order to represent orographically controlled winds (coastal jets) and katabatic winds. Significantly, time variability of surface winds strongly influences the structure of the mixed layer. Daily, if not more frequent, surface fluxes must be imposed for a realistic surface mixed layer. Sea ice and ice shelves are important components of the coastal circulation. Ice isolates the ocean from exchange with the atmosphere, especially in the winter. Melting and freezing of both sea ice and glacial ice influence salinity and thereby the character of shelf water. These water mass conversions are known to have an important ... Article in Journal/Newspaper Antarc* Antarctic Ice Shelves Ross Sea Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Ross Sea The Antarctic Ocean Science 6 2 513 524 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 J. M. Klinck M. S. Dinniman Exchange across the shelf break at high southern latitudes |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
Exchange of water across the Antarctic shelf break has considerable scientific and societal importance due to its effects on circulation and biology of the region, conversion of water masses as part of the global overturning circulation and basal melt of glacial ice and the consequent effect on sea level rise. The focus in this paper is the onshore transport of warm, oceanic Circumpolar Deep Water (CDW); export of dense water from these shelves is equally important, but has been the focus of other recent papers and will not be considered here. A variety of physical mechanisms are described which could play a role in this onshore flux. The relative importance of some processes are evaluated by simple calculations. A numerical model for the Ross Sea continental shelf is used as an example of a more comprehensive evaluation of the details of cross-shelf break exchange. In order for an ocean circulation model to simulate these processes at high southern latitudes, it needs to have high spatial resolution, realistic geometry and bathymetry. Grid spacing smaller than the first baroclinic radius of deformation (a few km) is required to adequately represent the circulation. Because of flow-topography interactions, bathymetry needs to be represented at these same small scales. Atmospheric conditions used to force these circulation models also need to be known at a similar small spatial resolution (a few km) in order to represent orographically controlled winds (coastal jets) and katabatic winds. Significantly, time variability of surface winds strongly influences the structure of the mixed layer. Daily, if not more frequent, surface fluxes must be imposed for a realistic surface mixed layer. Sea ice and ice shelves are important components of the coastal circulation. Ice isolates the ocean from exchange with the atmosphere, especially in the winter. Melting and freezing of both sea ice and glacial ice influence salinity and thereby the character of shelf water. These water mass conversions are known to have an important ... |
format |
Article in Journal/Newspaper |
author |
J. M. Klinck M. S. Dinniman |
author_facet |
J. M. Klinck M. S. Dinniman |
author_sort |
J. M. Klinck |
title |
Exchange across the shelf break at high southern latitudes |
title_short |
Exchange across the shelf break at high southern latitudes |
title_full |
Exchange across the shelf break at high southern latitudes |
title_fullStr |
Exchange across the shelf break at high southern latitudes |
title_full_unstemmed |
Exchange across the shelf break at high southern latitudes |
title_sort |
exchange across the shelf break at high southern latitudes |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/os-6-513-2010 https://doaj.org/article/aaf45ac6707a4407bb6658bf20210fb5 |
geographic |
Antarctic Ross Sea The Antarctic |
geographic_facet |
Antarctic Ross Sea The Antarctic |
genre |
Antarc* Antarctic Ice Shelves Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Ice Shelves Ross Sea Sea ice |
op_source |
Ocean Science, Vol 6, Iss 2, Pp 513-524 (2010) |
op_relation |
http://www.ocean-sci.net/6/513/2010/os-6-513-2010.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-6-513-2010 1812-0784 1812-0792 https://doaj.org/article/aaf45ac6707a4407bb6658bf20210fb5 |
op_doi |
https://doi.org/10.5194/os-6-513-2010 |
container_title |
Ocean Science |
container_volume |
6 |
container_issue |
2 |
container_start_page |
513 |
op_container_end_page |
524 |
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1766254744657985536 |