Weber, M. E.
Clark, P. U.
Mitrovica, J. X.
Hostetler, S. W.
Institute of Geology and Mineralogy, University of Cologne, Zuelpicher Strasse 49a, 50674 Cologne, Germany, College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA, Institute of Geology and Mineralogy, University of Cologne, Zuelpicher Strasse 49a, 50674 Cologne, Germany, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA, U.S. Geological Survey, College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA, Alfred Wegener Institute for Polar and Marine Research, Helmholtz Association, Am Alten Hafen 26, 27568 Bremerhaven, Germany
Interhemispheric Ice-Sheet Synchronicity During the Last Glacial Maximum
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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.