KlinkhammerGaryCEOASLinking8.2KAEvent.pdf
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:9880vs48x 2024-04-21T08:06:37+00:00 KlinkhammerGaryCEOASLinking8.2KAEvent.pdf 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/defaults/9880vs48x unknown https://ir.library.oregonstate.edu/concern/defaults/9880vs48x Copyright Not Evaluated ftoregonstate 2024-03-28T01:41:58Z 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. Other/Unknown Material Labrador Sea North Atlantic ScholarsArchive@OSU (Oregon State University) |
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ScholarsArchive@OSU (Oregon State University) |
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ftoregonstate |
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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. |
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. KlinkhammerGaryCEOASLinking8.2KAEvent.pdf |
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 |
KlinkhammerGaryCEOASLinking8.2KAEvent.pdf |
title_short |
KlinkhammerGaryCEOASLinking8.2KAEvent.pdf |
title_full |
KlinkhammerGaryCEOASLinking8.2KAEvent.pdf |
title_fullStr |
KlinkhammerGaryCEOASLinking8.2KAEvent.pdf |
title_full_unstemmed |
KlinkhammerGaryCEOASLinking8.2KAEvent.pdf |
title_sort |
klinkhammergaryceoaslinking8.2kaevent.pdf |
url |
https://ir.library.oregonstate.edu/concern/defaults/9880vs48x |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
https://ir.library.oregonstate.edu/concern/defaults/9880vs48x |
op_rights |
Copyright Not Evaluated |
_version_ |
1796946035252133888 |