Record Details
Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea |
| Names |
Hoffman, Jeremy S.
(creator) Carlson, Anders E. (creator) Winsor, Kelsey (creator) Klinkhammer, Gary P. (creator) LeGrande, Allegra N. (creator) Andrews, John T. (creator) Strasser, Jeffrey C. (creator) |
| Date Issued | 2012-09-20 (iso8601) |
| Note | This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://www.agu.org/journals/gl/. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. |
| Abstract | 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. |
| Genre | Article |
| Identifier | Hoffman, J. S., A. E. Carlson, K. Winsor, G. P. Klinkhammer, A. N. LeGrande, J. T. Andrews, and J. C. Strasser (2012), Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea, Geophysical Research Letters, 39, L18703, doi:10.1029/ 2012GL053047. |
