Evolution of the northeast Labrador Sea during the last interglaciation
Boreal summer insolation during the last interglaciation (LIG) generally warmed the subpolar to polar Northern Hemisphere more than during the early Holocene, yet regional climate variations between the two periods remain. We investigate northeast Labrador Sea subsurface temperature and hydrography...
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ftarchimer:oai:archimer.ifremer.fr:37604 2023-05-15T15:07:25+02:00 Evolution of the northeast Labrador Sea during the last interglaciation Winsor, Kelsey Carlson, Anders E. Klinkhammer, Gary P. Stoner, Joseph S. Hatfield, Robert G. 2012-11 application/pdf https://archimer.ifremer.fr/doc/00265/37604/36840.pdf https://doi.org/10.1029/2012GC004263 https://archimer.ifremer.fr/doc/00265/37604/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00265/37604/36840.pdf doi:10.1029/2012GC004263 https://archimer.ifremer.fr/doc/00265/37604/ This paper is not subject to U.S. copyright. Published in 2012 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2012-11 , Vol. 13 , N. 11 , P. Q11006 Neogloboquadrina pachyderma (sinistral) Labrador Sea Mg/Ca deglaciations interglaciations subpolar gyre text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.1029/2012GC004263 2021-09-23T20:26:05Z Boreal summer insolation during the last interglaciation (LIG) generally warmed the subpolar to polar Northern Hemisphere more than during the early Holocene, yet regional climate variations between the two periods remain. We investigate northeast Labrador Sea subsurface temperature and hydrography across terminations (T) I and II and during the LIG to assess the impact of two different magnitudes of boreal summer insolation increase on the northeast Labrador Sea. We use Mg/Ca ratios in Neogloboquadrina pachyderma (sinistral) as a proxy of calcification temperature to document changes in subsurface temperatures over Eirik Drift. Our corresponding record of delta O-18 of seawater documents changes in water mass salinity. Mg/Ca calcification temperatures peak early in the Holocene coincident with peak boreal summer insolation. In contrast, LIG temperatures are relatively constant through the interglaciation, and are no warmer than peak Holocene temperatures. During the first half of the LIG, delta O-18 of seawater remains depleted, likely from southern Greenland Ice Sheet retreat and enhanced Arctic freshwater and sea-ice export to the Labrador Sea. The consequent stratification of the Labrador Sea and attendant suppressed convection explains delayed deep-ocean ventilation and a cooler subsurface in the northeast Labrador Sea during the LIG. Article in Journal/Newspaper Arctic Greenland Ice Sheet Labrador Sea Neogloboquadrina pachyderma Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Greenland Geochemistry, Geophysics, Geosystems 13 11 |
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 |
Neogloboquadrina pachyderma (sinistral) Labrador Sea Mg/Ca deglaciations interglaciations subpolar gyre |
spellingShingle |
Neogloboquadrina pachyderma (sinistral) Labrador Sea Mg/Ca deglaciations interglaciations subpolar gyre Winsor, Kelsey Carlson, Anders E. Klinkhammer, Gary P. Stoner, Joseph S. Hatfield, Robert G. Evolution of the northeast Labrador Sea during the last interglaciation |
topic_facet |
Neogloboquadrina pachyderma (sinistral) Labrador Sea Mg/Ca deglaciations interglaciations subpolar gyre |
description |
Boreal summer insolation during the last interglaciation (LIG) generally warmed the subpolar to polar Northern Hemisphere more than during the early Holocene, yet regional climate variations between the two periods remain. We investigate northeast Labrador Sea subsurface temperature and hydrography across terminations (T) I and II and during the LIG to assess the impact of two different magnitudes of boreal summer insolation increase on the northeast Labrador Sea. We use Mg/Ca ratios in Neogloboquadrina pachyderma (sinistral) as a proxy of calcification temperature to document changes in subsurface temperatures over Eirik Drift. Our corresponding record of delta O-18 of seawater documents changes in water mass salinity. Mg/Ca calcification temperatures peak early in the Holocene coincident with peak boreal summer insolation. In contrast, LIG temperatures are relatively constant through the interglaciation, and are no warmer than peak Holocene temperatures. During the first half of the LIG, delta O-18 of seawater remains depleted, likely from southern Greenland Ice Sheet retreat and enhanced Arctic freshwater and sea-ice export to the Labrador Sea. The consequent stratification of the Labrador Sea and attendant suppressed convection explains delayed deep-ocean ventilation and a cooler subsurface in the northeast Labrador Sea during the LIG. |
format |
Article in Journal/Newspaper |
author |
Winsor, Kelsey Carlson, Anders E. Klinkhammer, Gary P. Stoner, Joseph S. Hatfield, Robert G. |
author_facet |
Winsor, Kelsey Carlson, Anders E. Klinkhammer, Gary P. Stoner, Joseph S. Hatfield, Robert G. |
author_sort |
Winsor, Kelsey |
title |
Evolution of the northeast Labrador Sea during the last interglaciation |
title_short |
Evolution of the northeast Labrador Sea during the last interglaciation |
title_full |
Evolution of the northeast Labrador Sea during the last interglaciation |
title_fullStr |
Evolution of the northeast Labrador Sea during the last interglaciation |
title_full_unstemmed |
Evolution of the northeast Labrador Sea during the last interglaciation |
title_sort |
evolution of the northeast labrador sea during the last interglaciation |
publisher |
Amer Geophysical Union |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00265/37604/36840.pdf https://doi.org/10.1029/2012GC004263 https://archimer.ifremer.fr/doc/00265/37604/ |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet Labrador Sea Neogloboquadrina pachyderma Sea ice |
genre_facet |
Arctic Greenland Ice Sheet Labrador Sea Neogloboquadrina pachyderma Sea ice |
op_source |
Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2012-11 , Vol. 13 , N. 11 , P. Q11006 |
op_relation |
https://archimer.ifremer.fr/doc/00265/37604/36840.pdf doi:10.1029/2012GC004263 https://archimer.ifremer.fr/doc/00265/37604/ |
op_rights |
This paper is not subject to U.S. copyright. Published in 2012 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2012GC004263 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
13 |
container_issue |
11 |
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1766338933942124544 |