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

Anders E. Carlson, Peter U Clark, Brian A. Haley, Gary P. Klinkhammer

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    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.
    LanguageEnglish
    PagesL14704
    JournalGeophysical Research Letters
    Volume36
    DOIs
    Publication statusPublished - Jul 2009

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    meridional circulation
    routing
    runoff
    Glacial Lake Agassiz
    drainage
    Laurentide Ice Sheet
    planktonic foraminifera
    ice sheet
    anomaly
    atmosphere
    lake
    climate
    ocean
    modeling
    simulation
    plain
    cold

    Cite this

    Carlson, Anders E. ; Clark, Peter U ; Haley, Brian A. ; Klinkhammer, Gary P. / Routing of western Canadian Plains runoff during the 8.2 ka cold event. In: Geophysical Research Letters. 2009 ; Vol. 36. pp. L14704.
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    title = "Routing of western Canadian Plains runoff during the 8.2 ka cold event",
    abstract = "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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    Routing of western Canadian Plains runoff during the 8.2 ka cold event. / Carlson, Anders E.; Clark, Peter U; Haley, Brian A.; Klinkhammer, Gary P.

    In: Geophysical Research Letters, Vol. 36, 07.2009, p. L14704.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Routing of western Canadian Plains runoff during the 8.2 ka cold event

    AU - Carlson, Anders E.

    AU - Clark, Peter U

    AU - Haley, Brian A.

    AU - Klinkhammer, Gary P.

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    AB - 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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