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      Deep Western Boundary Current variability in the subtropical northwest Atlantic Ocean during marine isotope stages 12-10 : DWBC VARIABILITY IN THE ATLANTIC

      1 , 1
      Geochemistry, Geophysics, Geosystems
      American Geophysical Union (AGU)

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          A Practical Guide to Wavelet Analysis

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            Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes.

            The Atlantic meridional overturning circulation is widely believed to affect climate. Changes in ocean circulation have been inferred from records of the deep water chemical composition derived from sedimentary nutrient proxies, but their impact on climate is difficult to assess because such reconstructions provide insufficient constraints on the rate of overturning. Here we report measurements of 231Pa/230Th, a kinematic proxy for the meridional overturning circulation, in a sediment core from the subtropical North Atlantic Ocean. We find that the meridional overturning was nearly, or completely, eliminated during the coldest deglacial interval in the North Atlantic region, beginning with the catastrophic iceberg discharge Heinrich event H1, 17,500 yr ago, and declined sharply but briefly into the Younger Dryas cold event, about 12,700 yr ago. Following these cold events, the 231Pa/230Th record indicates that rapid accelerations of the meridional overturning circulation were concurrent with the two strongest regional warming events during deglaciation. These results confirm the significance of variations in the rate of the Atlantic meridional overturning circulation for abrupt climate changes.
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              North Atlantic thermohaline circulation during the past 20,000 years linked to high-latitude surface temperature

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                Author and article information

                Journal
                Geochemistry, Geophysics, Geosystems
                Geochem. Geophys. Geosyst.
                American Geophysical Union (AGU)
                15252027
                June 2007
                June 2007
                June 26 2007
                : 8
                : 6
                : n/a
                Affiliations
                [1 ]School of Earth, Ocean and Planetary Science; Cardiff University; Main Building, Park Place,; Cardiff; CF10 3YE; UK
                Article
                10.1029/2006GC001518
                b17dd515-8e7a-429d-ba66-4c651dd5023f
                © 2007

                http://doi.wiley.com/10.1002/tdm_license_1.1

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