Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015
Using Argo floats, we show that a major deep convective activity occurred simultaneously in the Labrador Sea (LAB), South of Cap Farewell (SCF) and the Irminger Sea (IRM) during winter 2014–2015. Convection was driven by exceptional heat loss to the atmosphere (up to 50% higher than the climatologic...
Published in: | Geophysical Research Letters |
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Amer Geophysical Union
2017
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Online Access: | https://archimer.ifremer.fr/doc/00370/48072/48175.pdf https://archimer.ifremer.fr/doc/00370/48072/48176.pdf https://doi.org/10.1002/2016GL071895 https://archimer.ifremer.fr/doc/00370/48072/ |
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ftarchimer:oai:archimer.ifremer.fr:48072 2023-05-15T17:06:04+02:00 Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015 Piron, Anne Thierry, Virginie Mercier, Herle Caniaux, G. 2017-02 application/pdf https://archimer.ifremer.fr/doc/00370/48072/48175.pdf https://archimer.ifremer.fr/doc/00370/48072/48176.pdf https://doi.org/10.1002/2016GL071895 https://archimer.ifremer.fr/doc/00370/48072/ eng eng Amer Geophysical Union info:eu-repo/grantAgreement/EC/FP7/633211/EU//AtlantOS https://archimer.ifremer.fr/doc/00370/48072/48175.pdf https://archimer.ifremer.fr/doc/00370/48072/48176.pdf doi:10.1002/2016GL071895 https://archimer.ifremer.fr/doc/00370/48072/ 2016 American Geophysical Union. All rights reserved. info:eu-repo/semantics/openAccess restricted use Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2017-02 , Vol. 44 , N. 3 , P. 1439-1447 text Publication info:eu-repo/semantics/article 2017 ftarchimer https://doi.org/10.1002/2016GL071895 2021-09-23T20:29:12Z Using Argo floats, we show that a major deep convective activity occurred simultaneously in the Labrador Sea (LAB), South of Cap Farewell (SCF) and the Irminger Sea (IRM) during winter 2014–2015. Convection was driven by exceptional heat loss to the atmosphere (up to 50% higher than the climatological mean). This is the first observation of deep convection over such a widespread area. Mixed layer depths exceptionally reached 1700 m in SCF and 1400 m in IRM. The deep thermocline density gradient limited the mixed layer deepening in the Labrador Sea to 1800 m. Potential densities of deep waters were similar in the three basins (27.73-27.74 kg m−3), but warmer by 0.3 °C and saltier by 0.04 in IRM than in LAB and SCF, meaning that each basin formed locally its own deep water. The cold anomaly that developed recently in the North-Atlantic Ocean favored and was enhanced by this exceptional convection. Article in Journal/Newspaper Labrador Sea North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Geophysical Research Letters 44 3 1439 1447 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Using Argo floats, we show that a major deep convective activity occurred simultaneously in the Labrador Sea (LAB), South of Cap Farewell (SCF) and the Irminger Sea (IRM) during winter 2014–2015. Convection was driven by exceptional heat loss to the atmosphere (up to 50% higher than the climatological mean). This is the first observation of deep convection over such a widespread area. Mixed layer depths exceptionally reached 1700 m in SCF and 1400 m in IRM. The deep thermocline density gradient limited the mixed layer deepening in the Labrador Sea to 1800 m. Potential densities of deep waters were similar in the three basins (27.73-27.74 kg m−3), but warmer by 0.3 °C and saltier by 0.04 in IRM than in LAB and SCF, meaning that each basin formed locally its own deep water. The cold anomaly that developed recently in the North-Atlantic Ocean favored and was enhanced by this exceptional convection. |
format |
Article in Journal/Newspaper |
author |
Piron, Anne Thierry, Virginie Mercier, Herle Caniaux, G. |
spellingShingle |
Piron, Anne Thierry, Virginie Mercier, Herle Caniaux, G. Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015 |
author_facet |
Piron, Anne Thierry, Virginie Mercier, Herle Caniaux, G. |
author_sort |
Piron, Anne |
title |
Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015 |
title_short |
Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015 |
title_full |
Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015 |
title_fullStr |
Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015 |
title_full_unstemmed |
Gyre scale deep convection in the subpolar North-Atlantic Ocean during winter 2014-2015 |
title_sort |
gyre scale deep convection in the subpolar north-atlantic ocean during winter 2014-2015 |
publisher |
Amer Geophysical Union |
publishDate |
2017 |
url |
https://archimer.ifremer.fr/doc/00370/48072/48175.pdf https://archimer.ifremer.fr/doc/00370/48072/48176.pdf https://doi.org/10.1002/2016GL071895 https://archimer.ifremer.fr/doc/00370/48072/ |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Irminger Sea |
geographic_facet |
Irminger Sea |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2017-02 , Vol. 44 , N. 3 , P. 1439-1447 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/633211/EU//AtlantOS https://archimer.ifremer.fr/doc/00370/48072/48175.pdf https://archimer.ifremer.fr/doc/00370/48072/48176.pdf doi:10.1002/2016GL071895 https://archimer.ifremer.fr/doc/00370/48072/ |
op_rights |
2016 American Geophysical Union. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2016GL071895 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
3 |
container_start_page |
1439 |
op_container_end_page |
1447 |
_version_ |
1766060983407607808 |