Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution
Recent decadal salinity changes in the Greenland-Scotland overflow-derived deep waters are quantified using CTD data from repeated hydrographic sections in the Irminger Sea. The Denmark Strait Overflow Water salinity record shows the absence of any net change over the 1980s-2000s; changes in the Ice...
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Online Access: | https://archimer.ifremer.fr/doc/2010/publication-7325.pdf https://doi.org/10.1111/j.1600-0870.2009.00418.x https://archimer.ifremer.fr/doc/00000/7325/ |
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ftarchimer:oai:archimer.ifremer.fr:7325 2023-05-15T16:00:40+02:00 Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution Sarafanov, Artem Mercier, Herle Falina, Anastasia Sokov, Alexey Lherminier, Pascale 2010 application/pdf https://archimer.ifremer.fr/doc/2010/publication-7325.pdf https://doi.org/10.1111/j.1600-0870.2009.00418.x https://archimer.ifremer.fr/doc/00000/7325/ eng eng Wiley / Blackwell https://archimer.ifremer.fr/doc/2010/publication-7325.pdf doi:10.1111/j.1600-0870.2009.00418.x https://archimer.ifremer.fr/doc/00000/7325/ 2009 Wiley / Blackwell Munksgaard info:eu-repo/semantics/openAccess restricted use Tellus Series A: Dynamic Meteorology and Oceanography (0280-6495) (Wiley / Blackwell), 2010 , Vol. 62 , N. 2 , P. 80-90 text Publication info:eu-repo/semantics/article 2010 ftarchimer https://doi.org/10.1111/j.1600-0870.2009.00418.x 2021-09-23T20:17:51Z Recent decadal salinity changes in the Greenland-Scotland overflow-derived deep waters are quantified using CTD data from repeated hydrographic sections in the Irminger Sea. The Denmark Strait Overflow Water salinity record shows the absence of any net change over the 1980s-2000s; changes in the Iceland-Scotland Overflow Water (ISOW) and in the deep water column (Sigma(0) > 27.82), enclosing both overflows, show a distinct freshening reversal in the early 2000s. The observed freshening reversal is a lagged consequence of the persistent ISOW salinification that occurred upstream, in the Iceland Basin, after 1996 in response to salinification of the northeast Atlantic waters entrained into the overflow. The entrainment salinity increase is explained by the earlier documented North Atlantic Oscillation (NAO)-induced contraction of the subpolar gyre and corresponding northwestward advance of subtropical waters that followed the NAO decline in the mid-1990s and continued through the mid-2000s. Remarkably, the ISOW freshening reversal is not associated with changes in the overflow water salinity. This suggests that changes in the NAO-dependent relative contributions of subpolar and subtropical waters to the entrainment south of the Iceland-Scotland Ridge may dominate over changes in the Nordic Seas freshwater balance with respect to their effect on the ISOW salinity. Article in Journal/Newspaper Denmark Strait Greenland Iceland Nordic Seas North Atlantic North Atlantic oscillation Northeast Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Tellus A: Dynamic Meteorology and Oceanography 62 1 80 90 |
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 |
Recent decadal salinity changes in the Greenland-Scotland overflow-derived deep waters are quantified using CTD data from repeated hydrographic sections in the Irminger Sea. The Denmark Strait Overflow Water salinity record shows the absence of any net change over the 1980s-2000s; changes in the Iceland-Scotland Overflow Water (ISOW) and in the deep water column (Sigma(0) > 27.82), enclosing both overflows, show a distinct freshening reversal in the early 2000s. The observed freshening reversal is a lagged consequence of the persistent ISOW salinification that occurred upstream, in the Iceland Basin, after 1996 in response to salinification of the northeast Atlantic waters entrained into the overflow. The entrainment salinity increase is explained by the earlier documented North Atlantic Oscillation (NAO)-induced contraction of the subpolar gyre and corresponding northwestward advance of subtropical waters that followed the NAO decline in the mid-1990s and continued through the mid-2000s. Remarkably, the ISOW freshening reversal is not associated with changes in the overflow water salinity. This suggests that changes in the NAO-dependent relative contributions of subpolar and subtropical waters to the entrainment south of the Iceland-Scotland Ridge may dominate over changes in the Nordic Seas freshwater balance with respect to their effect on the ISOW salinity. |
format |
Article in Journal/Newspaper |
author |
Sarafanov, Artem Mercier, Herle Falina, Anastasia Sokov, Alexey Lherminier, Pascale |
spellingShingle |
Sarafanov, Artem Mercier, Herle Falina, Anastasia Sokov, Alexey Lherminier, Pascale Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution |
author_facet |
Sarafanov, Artem Mercier, Herle Falina, Anastasia Sokov, Alexey Lherminier, Pascale |
author_sort |
Sarafanov, Artem |
title |
Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution |
title_short |
Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution |
title_full |
Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution |
title_fullStr |
Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution |
title_full_unstemmed |
Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution |
title_sort |
cessation and partial reversal of deep water freshening in the northern north atlantic: observation-based estimates and attribution |
publisher |
Wiley / Blackwell |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/2010/publication-7325.pdf https://doi.org/10.1111/j.1600-0870.2009.00418.x https://archimer.ifremer.fr/doc/00000/7325/ |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Denmark Strait Greenland Iceland Nordic Seas North Atlantic North Atlantic oscillation Northeast Atlantic |
genre_facet |
Denmark Strait Greenland Iceland Nordic Seas North Atlantic North Atlantic oscillation Northeast Atlantic |
op_source |
Tellus Series A: Dynamic Meteorology and Oceanography (0280-6495) (Wiley / Blackwell), 2010 , Vol. 62 , N. 2 , P. 80-90 |
op_relation |
https://archimer.ifremer.fr/doc/2010/publication-7325.pdf doi:10.1111/j.1600-0870.2009.00418.x https://archimer.ifremer.fr/doc/00000/7325/ |
op_rights |
2009 Wiley / Blackwell Munksgaard info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1111/j.1600-0870.2009.00418.x |
container_title |
Tellus A: Dynamic Meteorology and Oceanography |
container_volume |
62 |
container_issue |
1 |
container_start_page |
80 |
op_container_end_page |
90 |
_version_ |
1766396671773638656 |