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The configuration of Northern Hemisphere ice sheets through the Quaternary.


ABSTRACT: Our understanding of how global climatic changes are translated into ice-sheet fluctuations and sea-level change is currently limited by a lack of knowledge of the configuration of ice sheets prior to the Last Glacial Maximum (LGM). Here, we compile a synthesis of empirical data and numerical modelling results related to pre-LGM ice sheets to produce new hypotheses regarding their extent in the Northern Hemisphere (NH) at 17 time-slices that span the Quaternary. Our reconstructions illustrate pronounced ice-sheet asymmetry within the last glacial cycle and significant variations in ice-marginal positions between older glacial cycles. We find support for a significant reduction in the extent of the Laurentide Ice Sheet (LIS) during MIS 3, implying that global sea levels may have been 30-40?m higher than most previous estimates. Our ice-sheet reconstructions illustrate the current state-of-the-art knowledge of pre-LGM ice sheets and provide a conceptual framework to interpret NH landscape evolution.

SUBMITTER: Batchelor CL 

PROVIDER: S-EPMC6697730 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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The configuration of Northern Hemisphere ice sheets through the Quaternary.

Batchelor Christine L CL   Margold Martin M   Krapp Mario M   Murton Della K DK   Dalton April S AS   Gibbard Philip L PL   Stokes Chris R CR   Murton Julian B JB   Manica Andrea A  

Nature communications 20190816 1


Our understanding of how global climatic changes are translated into ice-sheet fluctuations and sea-level change is currently limited by a lack of knowledge of the configuration of ice sheets prior to the Last Glacial Maximum (LGM). Here, we compile a synthesis of empirical data and numerical modelling results related to pre-LGM ice sheets to produce new hypotheses regarding their extent in the Northern Hemisphere (NH) at 17 time-slices that span the Quaternary. Our reconstructions illustrate pr  ...[more]

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