Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST
Deep convection is presumed to be vital for the North Atlantic Meridional Overturning Circulation,even though observational evidence for the link remains inconclusive. Modeling studies have suggested thatconvection will weaken as a result of enhanced freshwater input. The emergence of anomalously lo...
Published in: | Geophysical Research Letters |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://www.vliz.be/imisdocs/publications/60/295760.pdf |
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ftnioz:oai:imis.nioz.nl:261735 2023-05-15T17:29:29+02:00 Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST de Jong, M.F. de Steur, L. 2016 application/pdf https://www.vliz.be/imisdocs/publications/60/295760.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000380901600052 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/2016GL069596 https://www.vliz.be/imisdocs/publications/60/295760.pdf info:eu-repo/semantics/openAccess %3Ci%3EGeophys.+Res.+Lett.+43%3C%2Fi%3E%3A+7106%E2%80%937113.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2F2016GL069596%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2F2016GL069596%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftnioz https://doi.org/10.1002/2016GL069596 2022-05-01T14:04:04Z Deep convection is presumed to be vital for the North Atlantic Meridional Overturning Circulation,even though observational evidence for the link remains inconclusive. Modeling studies have suggested thatconvection will weaken as a result of enhanced freshwater input. The emergence of anomalously low seasurface temperature in the subpolar North Atlantic has led to speculation that this process is already at work.Hereweshow that strong atmospheric forcing in the winter of 2014–2015, associated with a high North AtlanticOscillation (NAO) index, produced record mixed layer depths in the Irminger Sea. Local mixing removed thestratification of the upper 1400mand ventilated the basin to middepths resembling a state similar to themid-1990s when a positive NAO also prevailed. We show that the strong local atmospheric forcing ispredominantly responsible for the negative sea surface temperature anomalies observed in the subpolar NorthAtlantic in 2015 and that there is no evidence of permanently weakened deep convection. Article in Journal/Newspaper North Atlantic NIOZ Repository (Royal Netherlands Institute for Sea Research) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Geophysical Research Letters 43 13 7106 7113 |
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Open Polar |
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NIOZ Repository (Royal Netherlands Institute for Sea Research) |
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ftnioz |
language |
English |
description |
Deep convection is presumed to be vital for the North Atlantic Meridional Overturning Circulation,even though observational evidence for the link remains inconclusive. Modeling studies have suggested thatconvection will weaken as a result of enhanced freshwater input. The emergence of anomalously low seasurface temperature in the subpolar North Atlantic has led to speculation that this process is already at work.Hereweshow that strong atmospheric forcing in the winter of 2014–2015, associated with a high North AtlanticOscillation (NAO) index, produced record mixed layer depths in the Irminger Sea. Local mixing removed thestratification of the upper 1400mand ventilated the basin to middepths resembling a state similar to themid-1990s when a positive NAO also prevailed. We show that the strong local atmospheric forcing ispredominantly responsible for the negative sea surface temperature anomalies observed in the subpolar NorthAtlantic in 2015 and that there is no evidence of permanently weakened deep convection. |
format |
Article in Journal/Newspaper |
author |
de Jong, M.F. de Steur, L. |
spellingShingle |
de Jong, M.F. de Steur, L. Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST |
author_facet |
de Jong, M.F. de Steur, L. |
author_sort |
de Jong, M.F. |
title |
Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST |
title_short |
Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST |
title_full |
Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST |
title_fullStr |
Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST |
title_full_unstemmed |
Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST |
title_sort |
strong winter cooling over the irminger sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low sst |
publishDate |
2016 |
url |
https://www.vliz.be/imisdocs/publications/60/295760.pdf |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Irminger Sea |
geographic_facet |
Irminger Sea |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
%3Ci%3EGeophys.+Res.+Lett.+43%3C%2Fi%3E%3A+7106%E2%80%937113.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2F2016GL069596%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2F2016GL069596%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000380901600052 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/2016GL069596 https://www.vliz.be/imisdocs/publications/60/295760.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016GL069596 |
container_title |
Geophysical Research Letters |
container_volume |
43 |
container_issue |
13 |
container_start_page |
7106 |
op_container_end_page |
7113 |
_version_ |
1766123619897835520 |