Deep ocean exchange with west-European shelf seas
We review mechanisms and studies of exchange between the north-east Atlantic and the adjacent shelf seas. Well-developed summer upwelling and associated filaments off Portugal and north-west Spain give exchange O(3 m2/s per unit length of shelf). Prevailing westerly winds further north drive exchang...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2009
|
Subjects: | |
Online Access: | http://www.ocean-sci.net/5/621/2009/os-5-621-2009.pdf https://doaj.org/article/d1f85f655b424fba889db77eab8e0c74 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:d1f85f655b424fba889db77eab8e0c74 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:d1f85f655b424fba889db77eab8e0c74 2023-05-15T17:38:33+02:00 Deep ocean exchange with west-European shelf seas J. M. Huthnance J. T. Holt S. L. Wakelin 2009-12-01 http://www.ocean-sci.net/5/621/2009/os-5-621-2009.pdf https://doaj.org/article/d1f85f655b424fba889db77eab8e0c74 en eng Copernicus Publications 1812-0784 1812-0792 http://www.ocean-sci.net/5/621/2009/os-5-621-2009.pdf https://doaj.org/article/d1f85f655b424fba889db77eab8e0c74 undefined Ocean Science, Vol 5, Iss 4, Pp 621-634 (2009) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2009 fttriple 2023-01-22T19:12:04Z We review mechanisms and studies of exchange between the north-east Atlantic and the adjacent shelf seas. Well-developed summer upwelling and associated filaments off Portugal and north-west Spain give exchange O(3 m2/s per unit length of shelf). Prevailing westerly winds further north drive exchange O(1 m2/s). Poleward flow along most of the upper slope has associated secondary circulation O(1 m2/s), meanders and eddies. Eddies are shed from slope waters into the Bay of Biscay, and local exchanges occur at shelf spurs and depressions or canyons (e.g. dense-water cascading of order 1 m2/s). Tidal transports are larger, but their reversal every six hours makes exchange largely ineffective except where internal tides are large and non-linear, as in the Celtic Sea where solitons carry water with exchange O(1 m2/s). These various physical exchanges amount to an estimated 2–3 m2/s per unit length of shelf, between ocean and shelf. A numerical model estimate is comparable: 2.5×106 m3/s onto and off the shelf from Brittany to Norway. Mixing controls the seasonal thermocline, affecting primary production and hence fluxes and fate of organic matter. Specifically, CO2 take-up by primary production, settling below the thermocline before respiration, and then off-shelf transport, make an effective shelf-sea "pump" (for CO2 from the atmosphere to the deep ocean). However, knowledge of biogeochemical fluxes is generally sparse, giving scope for more measurements, model validation and estimates from models. Article in Journal/Newspaper North East Atlantic Unknown Norway |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo J. M. Huthnance J. T. Holt S. L. Wakelin Deep ocean exchange with west-European shelf seas |
topic_facet |
envir geo |
description |
We review mechanisms and studies of exchange between the north-east Atlantic and the adjacent shelf seas. Well-developed summer upwelling and associated filaments off Portugal and north-west Spain give exchange O(3 m2/s per unit length of shelf). Prevailing westerly winds further north drive exchange O(1 m2/s). Poleward flow along most of the upper slope has associated secondary circulation O(1 m2/s), meanders and eddies. Eddies are shed from slope waters into the Bay of Biscay, and local exchanges occur at shelf spurs and depressions or canyons (e.g. dense-water cascading of order 1 m2/s). Tidal transports are larger, but their reversal every six hours makes exchange largely ineffective except where internal tides are large and non-linear, as in the Celtic Sea where solitons carry water with exchange O(1 m2/s). These various physical exchanges amount to an estimated 2–3 m2/s per unit length of shelf, between ocean and shelf. A numerical model estimate is comparable: 2.5×106 m3/s onto and off the shelf from Brittany to Norway. Mixing controls the seasonal thermocline, affecting primary production and hence fluxes and fate of organic matter. Specifically, CO2 take-up by primary production, settling below the thermocline before respiration, and then off-shelf transport, make an effective shelf-sea "pump" (for CO2 from the atmosphere to the deep ocean). However, knowledge of biogeochemical fluxes is generally sparse, giving scope for more measurements, model validation and estimates from models. |
format |
Article in Journal/Newspaper |
author |
J. M. Huthnance J. T. Holt S. L. Wakelin |
author_facet |
J. M. Huthnance J. T. Holt S. L. Wakelin |
author_sort |
J. M. Huthnance |
title |
Deep ocean exchange with west-European shelf seas |
title_short |
Deep ocean exchange with west-European shelf seas |
title_full |
Deep ocean exchange with west-European shelf seas |
title_fullStr |
Deep ocean exchange with west-European shelf seas |
title_full_unstemmed |
Deep ocean exchange with west-European shelf seas |
title_sort |
deep ocean exchange with west-european shelf seas |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
http://www.ocean-sci.net/5/621/2009/os-5-621-2009.pdf https://doaj.org/article/d1f85f655b424fba889db77eab8e0c74 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
Ocean Science, Vol 5, Iss 4, Pp 621-634 (2009) |
op_relation |
1812-0784 1812-0792 http://www.ocean-sci.net/5/621/2009/os-5-621-2009.pdf https://doaj.org/article/d1f85f655b424fba889db77eab8e0c74 |
op_rights |
undefined |
_version_ |
1766139038123687936 |