Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006
Combining hydrographic data from the OVIDE (Observatoire de la Variabilité Interannuelle à Decennale/Observatory of the Interannual to Decadal Variability) section (Greenland-Portugal) with Argo and historical CTD data over the period 1990–2006, we estimate the variability of the core properties of...
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Online Access: | https://archimer.ifremer.fr/doc/2007/publication-3487.pdf https://doi.org/10.1029/2007JC004443 https://archimer.ifremer.fr/doc/00000/3487/ |
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ftarchimer:oai:archimer.ifremer.fr:3487 2023-05-15T16:30:08+02:00 Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006 Thierry, Virginie De Boisseson, Eric Mercier, Herle 2008-04 application/pdf https://archimer.ifremer.fr/doc/2007/publication-3487.pdf https://doi.org/10.1029/2007JC004443 https://archimer.ifremer.fr/doc/00000/3487/ eng eng American Geophysical Union https://archimer.ifremer.fr/doc/2007/publication-3487.pdf doi:10.1029/2007JC004443 https://archimer.ifremer.fr/doc/00000/3487/ 2008 American Geophysical Union info:eu-repo/semantics/openAccess restricted use Journal of Geophysical Research ( JGR ) - Oceans (0148-0227) (American Geophysical Union), 2008-04 , Vol. 113 , N. C04016 , P. NIL_62-NIL_75 North Atlantic Oscillation subpolar mode water North Atlantic Ocean text Publication info:eu-repo/semantics/article 2008 ftarchimer https://doi.org/10.1029/2007JC004443 2021-09-23T20:15:24Z Combining hydrographic data from the OVIDE (Observatoire de la Variabilité Interannuelle à Decennale/Observatory of the Interannual to Decadal Variability) section (Greenland-Portugal) with Argo and historical CTD data over the period 1990–2006, we estimate the variability of the core properties of a variety of Subpolar Mode Water (SPMW) observed on the eastern flank of the Reykjanes Ridge. This SPMW acquires its core properties in the winter mixed layer along the eastern side of the Reykjanes Ridge. We find that the February sea surface temperature along the ridge is a proxy for its core temperature. The sources of this mode water are water masses advected by the mean cyclonic circulation in the Iceland Basin. A density compensated tendency for cooling and freshening of the SPMW core properties is observed in the early 1990s. It stops in 1996 and is followed by an increase in temperature and salinity (+1.41°C and +0.11 psu) and a decrease in density (−0.12 kg m−3) until at least 2003. During the entire period, the data do not show any significant modification in the depth of the mode water core while they suggest that the thickness of the layer shrank. The variability of the local air-sea freshwater and heat fluxes cannot explain the observed salinity and temperature variations. They are most likely related to the modifications of the properties of the SPMW sources due to the recently evidenced changes, driven by the North Atlantic Oscillation, in the relative contributions of subtropical waters and subpolar waters in the Iceland Basin. Article in Journal/Newspaper Greenland Iceland North Atlantic North Atlantic oscillation Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Journal of Geophysical Research 113 C4 |
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 |
topic |
North Atlantic Oscillation subpolar mode water North Atlantic Ocean |
spellingShingle |
North Atlantic Oscillation subpolar mode water North Atlantic Ocean Thierry, Virginie De Boisseson, Eric Mercier, Herle Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006 |
topic_facet |
North Atlantic Oscillation subpolar mode water North Atlantic Ocean |
description |
Combining hydrographic data from the OVIDE (Observatoire de la Variabilité Interannuelle à Decennale/Observatory of the Interannual to Decadal Variability) section (Greenland-Portugal) with Argo and historical CTD data over the period 1990–2006, we estimate the variability of the core properties of a variety of Subpolar Mode Water (SPMW) observed on the eastern flank of the Reykjanes Ridge. This SPMW acquires its core properties in the winter mixed layer along the eastern side of the Reykjanes Ridge. We find that the February sea surface temperature along the ridge is a proxy for its core temperature. The sources of this mode water are water masses advected by the mean cyclonic circulation in the Iceland Basin. A density compensated tendency for cooling and freshening of the SPMW core properties is observed in the early 1990s. It stops in 1996 and is followed by an increase in temperature and salinity (+1.41°C and +0.11 psu) and a decrease in density (−0.12 kg m−3) until at least 2003. During the entire period, the data do not show any significant modification in the depth of the mode water core while they suggest that the thickness of the layer shrank. The variability of the local air-sea freshwater and heat fluxes cannot explain the observed salinity and temperature variations. They are most likely related to the modifications of the properties of the SPMW sources due to the recently evidenced changes, driven by the North Atlantic Oscillation, in the relative contributions of subtropical waters and subpolar waters in the Iceland Basin. |
format |
Article in Journal/Newspaper |
author |
Thierry, Virginie De Boisseson, Eric Mercier, Herle |
author_facet |
Thierry, Virginie De Boisseson, Eric Mercier, Herle |
author_sort |
Thierry, Virginie |
title |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006 |
title_short |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006 |
title_full |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006 |
title_fullStr |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006 |
title_full_unstemmed |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990-2006 |
title_sort |
interannual variability of the subpolar mode water properties over the reykjanes ridge during 1990-2006 |
publisher |
American Geophysical Union |
publishDate |
2008 |
url |
https://archimer.ifremer.fr/doc/2007/publication-3487.pdf https://doi.org/10.1029/2007JC004443 https://archimer.ifremer.fr/doc/00000/3487/ |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Greenland Reykjanes |
geographic_facet |
Greenland Reykjanes |
genre |
Greenland Iceland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland Iceland North Atlantic North Atlantic oscillation |
op_source |
Journal of Geophysical Research ( JGR ) - Oceans (0148-0227) (American Geophysical Union), 2008-04 , Vol. 113 , N. C04016 , P. NIL_62-NIL_75 |
op_relation |
https://archimer.ifremer.fr/doc/2007/publication-3487.pdf doi:10.1029/2007JC004443 https://archimer.ifremer.fr/doc/00000/3487/ |
op_rights |
2008 American Geophysical Union info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2007JC004443 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
C4 |
_version_ |
1766019851690704896 |