Wind‐driven freshwater export at Cape Farewell
Increased freshwater input to the Subpolar North Atlantic from Greenland ice melt and the Arctic could strengthen stratification in deep convection regions and impact the overturning circulation. However, freshwater pathways from the east Greenland shelf to deep convection regions are not fully unde...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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Online Access: | https://www.vliz.be/imisdocs/publications/14/377414.pdf |
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ftnioz:oai:imis.nioz.nl:352135 2023-05-15T15:09:42+02:00 Wind‐driven freshwater export at Cape Farewell Duyck, E. Gelderloos, R. de Jong, M.F. 2022 application/pdf https://www.vliz.be/imisdocs/publications/14/377414.pdf en eng info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1029/2021jc018309 https://www.vliz.be/imisdocs/publications/14/377414.pdf info:eu-repo/semantics/openAccess %3Ci%3EJGR%3A+Oceans+127%285%29%3C%2Fi%3E%3A+e2021JC018309.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1029%2F2021jc018309%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1029%2F2021jc018309%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftnioz https://doi.org/10.1029/2021jc018309 2022-05-25T22:18:32Z Increased freshwater input to the Subpolar North Atlantic from Greenland ice melt and the Arctic could strengthen stratification in deep convection regions and impact the overturning circulation. However, freshwater pathways from the east Greenland shelf to deep convection regions are not fully understood. We investigate the role of strong wind events at Cape Farewell in driving surface freshwaters from the East Greenland Current to the Irminger Sea. Using a high-resolution model and an atmospheric reanalysis, we identify strong wind events and investigate their impact on freshwater export. Westerly tip jets are associated with the strongest and deepest freshwater export across the shelfbreak, with a mean of 37.5 mSv of freshwater in the first 100 m (with reference salinity 34.9). These wind events tilt isohalines and extend the front offshore, especially over Eirik Ridge. Moderate westerly events are associated with weaker export across the shelfbreak (mean of 15.9 mSv) but overall contribute to more freshwater export throughout the year, including in summer, when the shelf is particularly fresh. Particle tracking shows that half of the surface waters crossing the shelfbreak during tip jet events are exported away from the shelf, either entering the Irminger Gyre, or being driven over Eirik Ridge. During strong westerly wind events, sea ice detaches from the coast and veers toward the Irminger Sea, but the contribution of sea ice to freshwater export at the shelfbreak is minimal compared to liquid freshwater export due to limited sea ice cover at Cape Farewell. Article in Journal/Newspaper Arctic Cape Farewell East Greenland east greenland current Greenland North Atlantic Sea ice NIOZ Repository (Royal Netherlands Institute for Sea Research) Arctic Eirik Ridge ENVELOPE(-44.500,-44.500,58.500,58.500) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Journal of Geophysical Research: Oceans 127 5 |
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Open Polar |
collection |
NIOZ Repository (Royal Netherlands Institute for Sea Research) |
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ftnioz |
language |
English |
description |
Increased freshwater input to the Subpolar North Atlantic from Greenland ice melt and the Arctic could strengthen stratification in deep convection regions and impact the overturning circulation. However, freshwater pathways from the east Greenland shelf to deep convection regions are not fully understood. We investigate the role of strong wind events at Cape Farewell in driving surface freshwaters from the East Greenland Current to the Irminger Sea. Using a high-resolution model and an atmospheric reanalysis, we identify strong wind events and investigate their impact on freshwater export. Westerly tip jets are associated with the strongest and deepest freshwater export across the shelfbreak, with a mean of 37.5 mSv of freshwater in the first 100 m (with reference salinity 34.9). These wind events tilt isohalines and extend the front offshore, especially over Eirik Ridge. Moderate westerly events are associated with weaker export across the shelfbreak (mean of 15.9 mSv) but overall contribute to more freshwater export throughout the year, including in summer, when the shelf is particularly fresh. Particle tracking shows that half of the surface waters crossing the shelfbreak during tip jet events are exported away from the shelf, either entering the Irminger Gyre, or being driven over Eirik Ridge. During strong westerly wind events, sea ice detaches from the coast and veers toward the Irminger Sea, but the contribution of sea ice to freshwater export at the shelfbreak is minimal compared to liquid freshwater export due to limited sea ice cover at Cape Farewell. |
format |
Article in Journal/Newspaper |
author |
Duyck, E. Gelderloos, R. de Jong, M.F. |
spellingShingle |
Duyck, E. Gelderloos, R. de Jong, M.F. Wind‐driven freshwater export at Cape Farewell |
author_facet |
Duyck, E. Gelderloos, R. de Jong, M.F. |
author_sort |
Duyck, E. |
title |
Wind‐driven freshwater export at Cape Farewell |
title_short |
Wind‐driven freshwater export at Cape Farewell |
title_full |
Wind‐driven freshwater export at Cape Farewell |
title_fullStr |
Wind‐driven freshwater export at Cape Farewell |
title_full_unstemmed |
Wind‐driven freshwater export at Cape Farewell |
title_sort |
wind‐driven freshwater export at cape farewell |
publishDate |
2022 |
url |
https://www.vliz.be/imisdocs/publications/14/377414.pdf |
long_lat |
ENVELOPE(-44.500,-44.500,58.500,58.500) ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Arctic Eirik Ridge Greenland Irminger Sea |
geographic_facet |
Arctic Eirik Ridge Greenland Irminger Sea |
genre |
Arctic Cape Farewell East Greenland east greenland current Greenland North Atlantic Sea ice |
genre_facet |
Arctic Cape Farewell East Greenland east greenland current Greenland North Atlantic Sea ice |
op_source |
%3Ci%3EJGR%3A+Oceans+127%285%29%3C%2Fi%3E%3A+e2021JC018309.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1029%2F2021jc018309%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1029%2F2021jc018309%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1029/2021jc018309 https://www.vliz.be/imisdocs/publications/14/377414.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2021jc018309 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
5 |
_version_ |
1766340833689206784 |