Routing of western Canadian Plains runoff during the 8.2 ka cold event.

Carlson, A. E., Clark, P. U., Haley, Brian A. and Klinkhammer, G. P. (2009) Routing of western Canadian Plains runoff during the 8.2 ka cold event. Open Access Geophysical Research Letters, 36 . L14704. DOI 10.1029/2009GL038778.

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The collapse of the Laurentide Ice Sheet over Hudson Bay ∼8.47 ka allowed the rapid drainage of glacial Lake Agassiz into the Labrador Sea, an event identified as causing a reduction in Atlantic meridional overturning circulation (AMOC) and the 8.2 ka cold event. Atmosphere-ocean models simulations based on this forcing, however, fail to reproduce several characteristics of this event, particularly its duration. Here we use planktonic foraminifera U/Ca records to document the routing of western Canadian Plains runoff that accompanied ice-sheet collapse. Geochemical modeling of the ∼7 nmol/mol increase in U/Ca at the opening of Hudson Bay indicates an increase in freshwater discharge of 0.13 ± 0.03 Sverdrups (106 m3 s−1) from routing, a sufficient magnitude to cause an AMOC reduction. We suggest that this routing event suppressed AMOC strength for several centuries after the drainage of Lake Agassiz, explaining multi-centennial climate anomalies associated with the 8.2 ka cold event.

Document Type: Article
Keywords: 8.2 ka cold event; freshwater routing; Laurentide Ice Sheet
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2009GL038778
ISSN: 0094-8276
Date Deposited: 27 Aug 2009 10:06
Last Modified: 13 Oct 2017 07:43

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