Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event
In the mid 1990’s, the North Atlantic subpolar gyre has shown a dramatic warming event that has been thoroughly investigated from observations and numerical simulations. Some studies suggest that it is due to an interannual, wind-driven weakening and shrinking of the gyre that facilitated the penetr...
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fttriple:oai:gotriple.eu:10670/1.zd7jro 2023-05-15T17:06:13+02:00 Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event Barrier, Nicolas Deshayes, Julie Treguier, Anne-marie Cassou, Christophe https://doi.org/10.1016/j.pocean.2014.10.001 https://archimer.ifremer.fr/doc/00218/32882/31753.pdf https://archimer.ifremer.fr/doc/00218/32882/ en eng Pergamon-elsevier Science Ltd doi:10.1016/j.pocean.2014.10.001 10670/1.zd7jro https://archimer.ifremer.fr/doc/00218/32882/31753.pdf https://archimer.ifremer.fr/doc/00218/32882/ other Archimer, archive institutionnelle de l'Ifremer Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2015-01 , Vol. 130 , P. 75-90 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.pocean.2014.10.001 2023-01-22T17:13:22Z In the mid 1990’s, the North Atlantic subpolar gyre has shown a dramatic warming event that has been thoroughly investigated from observations and numerical simulations. Some studies suggest that it is due to an interannual, wind-driven weakening and shrinking of the gyre that facilitated the penetration of warm Atlantic Water, the weakening of the gyre being attributed to changes in the North Atlantic Oscillation (NAO) and the East Atlantic Pattern, which are the two dominant modes of atmospheric variability in the North Atlantic. However, other studies suggest that the warming event is due to a decadal, buoyancy-driven strengthening of the meridional overturning circulation and subsequent intensification of the poleward heat transport, in response to the positive NAO conditions of 1988-1995. To reconcile this discrepancy, the heat budget in the North Atlantic subpolar gyre is reconstructed from four ocean hindcast simulations sharing the same modelling platform but using different settings. The novelty of this work is the decomposition of the subpolar gyre into a western and an eastern subregion, which is motivated by water mass distribution around Reykjanes Ridge and by the fact that deep convection only occurs in the western subpolar gyre. In the western subpolar gyre, the 1995 warming event is the decadal, baroclinic ocean response to positive NAO conditions from 1988 to 1995. The latter induced increased surface heat loss in the Labrador Sea that intensified deep convection hence strengthened the meridional overturning circulation and the associated poleward heat transport. In the eastern subregion, a concomittant warming was induced by an interannual, barotropic adjustment of the gyre circulation to an abrupt change from positive to negative NAO conditions in the winter 1995-1996. Indeed, the gyre response to negative NAO conditions is a cyclonic intergyre-gyre which increases northward volume and heat transports at the southeastern limit of subpolar gyre. Therefore, the discrepancies found in the ... Text Labrador Sea North Atlantic North Atlantic oscillation Unknown Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Progress in Oceanography 130 75 90 |
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fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo Barrier, Nicolas Deshayes, Julie Treguier, Anne-marie Cassou, Christophe Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event |
topic_facet |
envir geo |
description |
In the mid 1990’s, the North Atlantic subpolar gyre has shown a dramatic warming event that has been thoroughly investigated from observations and numerical simulations. Some studies suggest that it is due to an interannual, wind-driven weakening and shrinking of the gyre that facilitated the penetration of warm Atlantic Water, the weakening of the gyre being attributed to changes in the North Atlantic Oscillation (NAO) and the East Atlantic Pattern, which are the two dominant modes of atmospheric variability in the North Atlantic. However, other studies suggest that the warming event is due to a decadal, buoyancy-driven strengthening of the meridional overturning circulation and subsequent intensification of the poleward heat transport, in response to the positive NAO conditions of 1988-1995. To reconcile this discrepancy, the heat budget in the North Atlantic subpolar gyre is reconstructed from four ocean hindcast simulations sharing the same modelling platform but using different settings. The novelty of this work is the decomposition of the subpolar gyre into a western and an eastern subregion, which is motivated by water mass distribution around Reykjanes Ridge and by the fact that deep convection only occurs in the western subpolar gyre. In the western subpolar gyre, the 1995 warming event is the decadal, baroclinic ocean response to positive NAO conditions from 1988 to 1995. The latter induced increased surface heat loss in the Labrador Sea that intensified deep convection hence strengthened the meridional overturning circulation and the associated poleward heat transport. In the eastern subregion, a concomittant warming was induced by an interannual, barotropic adjustment of the gyre circulation to an abrupt change from positive to negative NAO conditions in the winter 1995-1996. Indeed, the gyre response to negative NAO conditions is a cyclonic intergyre-gyre which increases northward volume and heat transports at the southeastern limit of subpolar gyre. Therefore, the discrepancies found in the ... |
format |
Text |
author |
Barrier, Nicolas Deshayes, Julie Treguier, Anne-marie Cassou, Christophe |
author_facet |
Barrier, Nicolas Deshayes, Julie Treguier, Anne-marie Cassou, Christophe |
author_sort |
Barrier, Nicolas |
title |
Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event |
title_short |
Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event |
title_full |
Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event |
title_fullStr |
Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event |
title_full_unstemmed |
Heat budget in the North Atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event |
title_sort |
heat budget in the north atlantic subpolar gyre: impacts of atmospheric weather regimes on the 1995 warming event |
publisher |
Pergamon-elsevier Science Ltd |
url |
https://doi.org/10.1016/j.pocean.2014.10.001 https://archimer.ifremer.fr/doc/00218/32882/31753.pdf https://archimer.ifremer.fr/doc/00218/32882/ |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Reykjanes |
geographic_facet |
Reykjanes |
genre |
Labrador Sea North Atlantic North Atlantic oscillation |
genre_facet |
Labrador Sea North Atlantic North Atlantic oscillation |
op_source |
Archimer, archive institutionnelle de l'Ifremer Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2015-01 , Vol. 130 , P. 75-90 |
op_relation |
doi:10.1016/j.pocean.2014.10.001 10670/1.zd7jro https://archimer.ifremer.fr/doc/00218/32882/31753.pdf https://archimer.ifremer.fr/doc/00218/32882/ |
op_rights |
other |
op_doi |
https://doi.org/10.1016/j.pocean.2014.10.001 |
container_title |
Progress in Oceanography |
container_volume |
130 |
container_start_page |
75 |
op_container_end_page |
90 |
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1766061251276832768 |