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

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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.
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  • Carlson, A. E., P. U. Clark, B. A. Haley, and G. P. Klinkhammer (2009), Routing of western Canadian Plains runoff during the 8.2 ka cold event, Geophys. Res. Lett., 36, L14704.
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  • Vol. 36 (2009)
  • description.provenance : Made available in DSpace on 2010-07-28T23:28:18Z (GMT). No. of bitstreams: 1 Carlson_et_al_Geophys_Res_Lett_2009.pdf: 170622 bytes, checksum: cd78b4d64617baab43651e5c5bcc65e2 (MD5) Previous issue date: 2009-07-18
  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2010-07-28T23:28:18Z (GMT) No. of bitstreams: 1 Carlson_et_al_Geophys_Res_Lett_2009.pdf: 170622 bytes, checksum: cd78b4d64617baab43651e5c5bcc65e2 (MD5)
  • Geophysical Research Letters
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