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      Iceberg discharges of the last glacial period driven by oceanic circulation changes.

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          Abstract

          Proxy data reveal the existence of episodes of increased deposition of ice-rafted detritus in the North Atlantic Ocean during the last glacial period interpreted as massive iceberg discharges from the Laurentide Ice Sheet. Although these have long been attributed to self-sustained ice sheet oscillations, growing evidence of the crucial role that the ocean plays both for past and future behavior of the cryosphere suggests a climatic control of these ice surges. Here, we present simulations of the last glacial period carried out with a hybrid ice sheet-ice shelf model forced by an oceanic warming index derived from proxy data that accounts for the impact of past ocean circulation changes on ocean temperatures. The model generates a time series of iceberg discharge that closely agrees with ice-rafted debris records over the past 80 ka, indicating that oceanic circulation variations were responsible for the enigmatic ice purges of the last ice age.

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          Author and article information

          Journal
          Proc. Natl. Acad. Sci. U.S.A.
          Proceedings of the National Academy of Sciences of the United States of America
          Proceedings of the National Academy of Sciences
          1091-6490
          0027-8424
          Oct 08 2013
          : 110
          : 41
          Affiliations
          [1 ] Universidad Complutense de Madrid, 28040 Madrid, Spain.
          Article
          1306622110
          10.1073/pnas.1306622110
          3799353
          24062437
          7702d014-984d-4489-88f2-71c3529086f6
          History

          abrupt changes,climate modeling,glacial climate variability

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