Atlantic-Origin Overflow Water in the East Greenland Current
Dense water masses transported southward along the east coast of Greenland in the East Greenland Current (EGC) form the largest contribution to the Denmark Strait Overflow. When exiting Denmark Strait these dense water masses sink to depth and feed the deep circulation in the North Atlantic. Based o...
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Online Access: | https://hdl.handle.net/1956/22937 https://doi.org/10.1175/jpo-d-18-0216.1 |
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ftunivbergen:oai:bora.uib.no:1956/22937 2023-05-15T16:00:35+02:00 Atlantic-Origin Overflow Water in the East Greenland Current Håvik, Lisbeth Almansi, Mattia Våge, Kjetil Haine, Thomas W.N. 2020-02-13T09:00:53Z application/pdf https://hdl.handle.net/1956/22937 https://doi.org/10.1175/jpo-d-18-0216.1 eng eng AMS Bergens forskningsstiftelse: BFS2016REK01 Norges forskningsråd: 231647 urn:issn:0022-3670 urn:issn:1520-0485 https://hdl.handle.net/1956/22937 https://doi.org/10.1175/jpo-d-18-0216.1 cristin:1742663 Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2019 American Meteorological Society Journal of Physical Oceanography Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1175/jpo-d-18-0216.1 2023-03-14T17:40:58Z Dense water masses transported southward along the east coast of Greenland in the East Greenland Current (EGC) form the largest contribution to the Denmark Strait Overflow. When exiting Denmark Strait these dense water masses sink to depth and feed the deep circulation in the North Atlantic. Based on one year of mooring observations upstream of Denmark Strait and historical hydrographic profiles between Fram Strait and Denmark Strait, we find that a large part (75%) of the overflow water ( ≥ 27.8 kg m−3) transported by the EGC is of Atlantic origin (potential temperature θ > 0°C). The along-stream changes in temperature of the Atlantic-origin Water are moderate north of 69°N at the northern end of Blosseville basin, but southward from this point the temperature decreases more rapidly. We hypothesize that this enhanced modification is related to the bifurcation of the EGC taking place close to 69°N into the shelfbreak EGC and the separated EGC. This is associated with enhanced eddy activity and strong water mass modification reducing the intermediate temperature and salinity maxima of the Atlantic-origin Water. During periods with a large (small) degree of modification the separated current is strong (weak). Output from a high-resolution numerical model supports our hypothesis and reveals that large eddy activity is associated with an offshore shift of the surface freshwater layer that characterizes the Greenland shelf. The intensity of the eddy activity regulates the density and the hydrographic properties of the Denmark Strait Overflow Water transported by the EGC system. publishedVersion Article in Journal/Newspaper Denmark Strait East Greenland east greenland current Fram Strait Greenland North Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Greenland Journal of Physical Oceanography 49 9 2255 2269 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Dense water masses transported southward along the east coast of Greenland in the East Greenland Current (EGC) form the largest contribution to the Denmark Strait Overflow. When exiting Denmark Strait these dense water masses sink to depth and feed the deep circulation in the North Atlantic. Based on one year of mooring observations upstream of Denmark Strait and historical hydrographic profiles between Fram Strait and Denmark Strait, we find that a large part (75%) of the overflow water ( ≥ 27.8 kg m−3) transported by the EGC is of Atlantic origin (potential temperature θ > 0°C). The along-stream changes in temperature of the Atlantic-origin Water are moderate north of 69°N at the northern end of Blosseville basin, but southward from this point the temperature decreases more rapidly. We hypothesize that this enhanced modification is related to the bifurcation of the EGC taking place close to 69°N into the shelfbreak EGC and the separated EGC. This is associated with enhanced eddy activity and strong water mass modification reducing the intermediate temperature and salinity maxima of the Atlantic-origin Water. During periods with a large (small) degree of modification the separated current is strong (weak). Output from a high-resolution numerical model supports our hypothesis and reveals that large eddy activity is associated with an offshore shift of the surface freshwater layer that characterizes the Greenland shelf. The intensity of the eddy activity regulates the density and the hydrographic properties of the Denmark Strait Overflow Water transported by the EGC system. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Håvik, Lisbeth Almansi, Mattia Våge, Kjetil Haine, Thomas W.N. |
spellingShingle |
Håvik, Lisbeth Almansi, Mattia Våge, Kjetil Haine, Thomas W.N. Atlantic-Origin Overflow Water in the East Greenland Current |
author_facet |
Håvik, Lisbeth Almansi, Mattia Våge, Kjetil Haine, Thomas W.N. |
author_sort |
Håvik, Lisbeth |
title |
Atlantic-Origin Overflow Water in the East Greenland Current |
title_short |
Atlantic-Origin Overflow Water in the East Greenland Current |
title_full |
Atlantic-Origin Overflow Water in the East Greenland Current |
title_fullStr |
Atlantic-Origin Overflow Water in the East Greenland Current |
title_full_unstemmed |
Atlantic-Origin Overflow Water in the East Greenland Current |
title_sort |
atlantic-origin overflow water in the east greenland current |
publisher |
AMS |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/22937 https://doi.org/10.1175/jpo-d-18-0216.1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Denmark Strait East Greenland east greenland current Fram Strait Greenland North Atlantic |
genre_facet |
Denmark Strait East Greenland east greenland current Fram Strait Greenland North Atlantic |
op_source |
Journal of Physical Oceanography |
op_relation |
Bergens forskningsstiftelse: BFS2016REK01 Norges forskningsråd: 231647 urn:issn:0022-3670 urn:issn:1520-0485 https://hdl.handle.net/1956/22937 https://doi.org/10.1175/jpo-d-18-0216.1 cristin:1742663 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2019 American Meteorological Society |
op_doi |
https://doi.org/10.1175/jpo-d-18-0216.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
49 |
container_issue |
9 |
container_start_page |
2255 |
op_container_end_page |
2269 |
_version_ |
1766396585556574208 |