A new global ice sheet reconstruction for the past 80 000 years

Evan J. Gowan (), Xu Zhang, Sara Khosravi, Alessio Rovere, Paolo Stocchi, Anna L. C. Hughes, Richard Gyllencreutz, Jan Mangerud, John-Inge Svendsen and Gerrit Lohmann
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Evan J. Gowan: Helmholtz Center for Polar and Marine Research
Xu Zhang: Lanzhou University
Sara Khosravi: Helmholtz Center for Polar and Marine Research
Alessio Rovere: University of Bremen
Paolo Stocchi: NIOZ
Anna L. C. Hughes: University of Manchester
Richard Gyllencreutz: Stockholm University
Jan Mangerud: University of Bergen and Bjerknes Centre for Climate Research
John-Inge Svendsen: University of Bergen and Bjerknes Centre for Climate Research
Gerrit Lohmann: Helmholtz Center for Polar and Marine Research

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract The evolution of past global ice sheets is highly uncertain. One example is the missing ice problem during the Last Glacial Maximum (LGM, 26 000-19 000 years before present) – an apparent 8-28 m discrepancy between far-field sea level indicators and modelled sea level from ice sheet reconstructions. In the absence of ice sheet reconstructions, researchers often use marine δ18O proxy records to infer ice volume prior to the LGM. We present a global ice sheet reconstruction for the past 80 000 years, called PaleoMIST 1.0, constructed independently of far-field sea level and δ18O proxy records. Our reconstruction is compatible with LGM far-field sea-level records without requiring extra ice volume, thus solving the missing ice problem. However, for Marine Isotope Stage 3 (57 000-29 000 years before present) - a pre-LGM period - our reconstruction does not match proxy-based sea level reconstructions, indicating the relationship between marine δ18O and sea level may be more complex than assumed.

Date: 2021
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DOI: 10.1038/s41467-021-21469-w

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