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


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evan.gowan [ at ] awi.de

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 δ 18 O 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 inde- pendently of far-field sea level and δ 18 O 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 δ 18 O and sea level may be more complex than assumed.



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Article
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Helmholtz Program: Cooperations Across Research Fields (2021-2027): CARF
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ISI/Scopus peer-reviewed
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Published
Eprint ID
53758
DOI 10.1038/s41467-021-21469-w

Cite as
Gowan, E. J. , Zhang, X. , Khosravi, S. , Rovere, A. , Stocchi, P. , Hughes, A. L. C. , Gyllencreutz, R. , Mangerud, J. , Svendsen, J. I. and Lohmann, G. (2021): A new global ice sheet reconstruction for the past 80 000 years , Nature Communications, 12 (1199), pp. 1-9 . doi: 10.1038/s41467-021-21469-w


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