Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea
The 8.2 ka event was the last deglacial abrupt climate event. A reduction in the Atlantic meridional overturning circulation (AMOC) attributed to the drainage of glacial Lake Agassiz may have caused the event, but the freshwater signature of Lake Agassiz discharge has yet to be identified in delta O...
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Amer Geophysical Union
2012
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Online Access: | https://archimer.ifremer.fr/doc/00496/60740/65179.pdf https://archimer.ifremer.fr/doc/00496/60740/65192.pdf https://archimer.ifremer.fr/doc/00496/60740/65194.txt https://archimer.ifremer.fr/doc/00496/60740/65195.txt https://archimer.ifremer.fr/doc/00496/60740/65196.pdf https://archimer.ifremer.fr/doc/00496/60740/65197.txt https://archimer.ifremer.fr/doc/00496/60740/65198.txt https://archimer.ifremer.fr/doc/00496/60740/65199.txt https://doi.org/10.1029/2012GL053047 https://archimer.ifremer.fr/doc/00496/60740/ |
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ftarchimer:oai:archimer.ifremer.fr:60740 2023-05-15T17:06:00+02:00 Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea Hoffman, Jeremy S. Carlson, Anders E. Winsor, Kelsey Klinkhammer, Gary P. Legrande, Allegra N. Andrews, John T. Strasser, Jeffrey C. 2012-09 application/pdf https://archimer.ifremer.fr/doc/00496/60740/65179.pdf https://archimer.ifremer.fr/doc/00496/60740/65192.pdf https://archimer.ifremer.fr/doc/00496/60740/65194.txt https://archimer.ifremer.fr/doc/00496/60740/65195.txt https://archimer.ifremer.fr/doc/00496/60740/65196.pdf https://archimer.ifremer.fr/doc/00496/60740/65197.txt https://archimer.ifremer.fr/doc/00496/60740/65198.txt https://archimer.ifremer.fr/doc/00496/60740/65199.txt https://doi.org/10.1029/2012GL053047 https://archimer.ifremer.fr/doc/00496/60740/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00496/60740/65179.pdf https://archimer.ifremer.fr/doc/00496/60740/65192.pdf https://archimer.ifremer.fr/doc/00496/60740/65194.txt https://archimer.ifremer.fr/doc/00496/60740/65195.txt https://archimer.ifremer.fr/doc/00496/60740/65196.pdf https://archimer.ifremer.fr/doc/00496/60740/65197.txt https://archimer.ifremer.fr/doc/00496/60740/65198.txt https://archimer.ifremer.fr/doc/00496/60740/65199.txt doi:10.1029/2012GL053047 https://archimer.ifremer.fr/doc/00496/60740/ info:eu-repo/semantics/openAccess restricted use Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2012-09 , Vol. 39 , N. 18 , P. L18703 (5p.) text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.1029/2012GL053047 2021-09-23T20:32:46Z The 8.2 ka event was the last deglacial abrupt climate event. A reduction in the Atlantic meridional overturning circulation (AMOC) attributed to the drainage of glacial Lake Agassiz may have caused the event, but the freshwater signature of Lake Agassiz discharge has yet to be identified in delta O-18 of foraminiferal calcite records from the Labrador Sea, calling into question the connection between freshwater discharge to the North Atlantic and AMOC strength. Using Mg/Ca-paleothermometry, we demonstrate that similar to 3 degrees C of near-surface ocean cooling masked an similar to 1.0 parts per thousand decrease in western Labrador Sea delta O-18 of seawater concurrent with Lake Agassiz drainage. Comparison with North Atlantic delta O-18 of seawater records shows that the freshwater discharge was transported to regions of deep-water formation where it could perturb AMOC and force the 8.2 ka event. Article in Journal/Newspaper Labrador Sea North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Geophysical Research Letters 39 18 |
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 |
The 8.2 ka event was the last deglacial abrupt climate event. A reduction in the Atlantic meridional overturning circulation (AMOC) attributed to the drainage of glacial Lake Agassiz may have caused the event, but the freshwater signature of Lake Agassiz discharge has yet to be identified in delta O-18 of foraminiferal calcite records from the Labrador Sea, calling into question the connection between freshwater discharge to the North Atlantic and AMOC strength. Using Mg/Ca-paleothermometry, we demonstrate that similar to 3 degrees C of near-surface ocean cooling masked an similar to 1.0 parts per thousand decrease in western Labrador Sea delta O-18 of seawater concurrent with Lake Agassiz drainage. Comparison with North Atlantic delta O-18 of seawater records shows that the freshwater discharge was transported to regions of deep-water formation where it could perturb AMOC and force the 8.2 ka event. |
format |
Article in Journal/Newspaper |
author |
Hoffman, Jeremy S. Carlson, Anders E. Winsor, Kelsey Klinkhammer, Gary P. Legrande, Allegra N. Andrews, John T. Strasser, Jeffrey C. |
spellingShingle |
Hoffman, Jeremy S. Carlson, Anders E. Winsor, Kelsey Klinkhammer, Gary P. Legrande, Allegra N. Andrews, John T. Strasser, Jeffrey C. Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea |
author_facet |
Hoffman, Jeremy S. Carlson, Anders E. Winsor, Kelsey Klinkhammer, Gary P. Legrande, Allegra N. Andrews, John T. Strasser, Jeffrey C. |
author_sort |
Hoffman, Jeremy S. |
title |
Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea |
title_short |
Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea |
title_full |
Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea |
title_fullStr |
Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea |
title_full_unstemmed |
Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea |
title_sort |
linking the 8.2 ka event and its freshwater forcing in the labrador sea |
publisher |
Amer Geophysical Union |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00496/60740/65179.pdf https://archimer.ifremer.fr/doc/00496/60740/65192.pdf https://archimer.ifremer.fr/doc/00496/60740/65194.txt https://archimer.ifremer.fr/doc/00496/60740/65195.txt https://archimer.ifremer.fr/doc/00496/60740/65196.pdf https://archimer.ifremer.fr/doc/00496/60740/65197.txt https://archimer.ifremer.fr/doc/00496/60740/65198.txt https://archimer.ifremer.fr/doc/00496/60740/65199.txt https://doi.org/10.1029/2012GL053047 https://archimer.ifremer.fr/doc/00496/60740/ |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake |
geographic_facet |
Glacial Lake |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2012-09 , Vol. 39 , N. 18 , P. L18703 (5p.) |
op_relation |
https://archimer.ifremer.fr/doc/00496/60740/65179.pdf https://archimer.ifremer.fr/doc/00496/60740/65192.pdf https://archimer.ifremer.fr/doc/00496/60740/65194.txt https://archimer.ifremer.fr/doc/00496/60740/65195.txt https://archimer.ifremer.fr/doc/00496/60740/65196.pdf https://archimer.ifremer.fr/doc/00496/60740/65197.txt https://archimer.ifremer.fr/doc/00496/60740/65198.txt https://archimer.ifremer.fr/doc/00496/60740/65199.txt doi:10.1029/2012GL053047 https://archimer.ifremer.fr/doc/00496/60740/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2012GL053047 |
container_title |
Geophysical Research Letters |
container_volume |
39 |
container_issue |
18 |
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1766060900457906176 |