Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3614704c&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 14, CiteID L14704
Physics
2
Paleoceanography: Abrupt/Rapid Climate Change (1605), Paleoceanography: Geochemical Tracers, Paleoceanography: Thermohaline, Cryosphere: Ice Sheets
Scientific paper
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.
Carlson Anders E.
Clark Peter U.
Haley Brian A.
Klinkhammer Gary P.
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