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 δ¹⁸O of...
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ftoregonstate:ir.library.oregonstate.edu:pk02cc18r 2024-09-15T18:17:12+00:00 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. https://ir.library.oregonstate.edu/concern/articles/pk02cc18r English [eng] eng unknown American Geophysical Union https://ir.library.oregonstate.edu/concern/articles/pk02cc18r Copyright Not Evaluated Article ftoregonstate 2024-07-22T18:06:04Z 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 δ¹⁸O 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 ∼3°C of near-surface ocean cooling masked an ∼1.0‰ decrease in western Labrador Sea δ¹⁸O of seawater concurrent with Lake Agassiz drainage. Comparison with North Atlantic δ¹⁸O 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 ScholarsArchive@OSU (Oregon State University) |
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ftoregonstate |
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English unknown |
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 δ¹⁸O 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 ∼3°C of near-surface ocean cooling masked an ∼1.0‰ decrease in western Labrador Sea δ¹⁸O of seawater concurrent with Lake Agassiz drainage. Comparison with North Atlantic δ¹⁸O 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 |
American Geophysical Union |
url |
https://ir.library.oregonstate.edu/concern/articles/pk02cc18r |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
https://ir.library.oregonstate.edu/concern/articles/pk02cc18r |
op_rights |
Copyright Not Evaluated |
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1810455189719613440 |