Interhemispheric Ice-Sheet Synchronicity During the Last Glacial Maximum

Michael E. Weber, Peter U Clark, Werner Ricken, Jerry X. Mitrovica, Steven W. Hostetler, Gerhard Kuhn

    Research output: Contribution to journalArticle

    49 Citations (Scopus)

    Abstract

    The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous with most sectors of Northern Hemisphere ice sheets. Surface climate forcing of Antarctic mass balance would probably cause an opposite response, whereby a warming climate would increase accumulation but not surface melting. Our new data support teleconnections involving sea-level forcing from Northern Hemisphere ice sheets and changes in North Atlantic deep-water formation and attendant heat flux to Antarctic grounding lines to synchronize the hemispheric ice sheets.
    Original languageEnglish
    Pages (from-to)1265-1269
    JournalScience
    Volume334
    Issue number6060
    DOIs
    Publication statusPublished - Dec 2011

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