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      Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica

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          Abstract

          Abstract. Widespread existing geological records from above the modern ice sheet surface and outboard of the current ice margin show that the Antarctic Ice Sheet (AIS) was much more extensive at the Last Glacial Maximum (∼ 20 ka) than at present. However, whether it was ever smaller than present during the last few millennia, and (if so) by how much, is known only for a few locations because direct evidence lies within or beneath the ice sheet, which is challenging to access. Here, we describe how retreat and readvance (henceforth “readvance”) of AIS grounding lines during the Holocene could be detected and quantified using subglacial bedrock, subglacial sediments, marine sediment cores, relative sea-level (RSL) records, geodetic observations, radar data, and ice cores. Of these, only subglacial bedrock and subglacial sediments can provide direct evidence for readvance. Marine archives are of limited utility because readvance commonly covers evidence of earlier retreat. Nevertheless, stratigraphic transitions documenting change in environment may provide support for direct evidence from subglacial records, as can the presence of transgressions in RSL records, and isostatic subsidence. With independent age control, ice structure revealed by radar can be used to infer past changes in ice flow and geometry, and therefore potential readvance. Since ice cores capture changes in surface mass balance, elevation, and atmospheric and oceanic circulation that are known to drive grounding line migration, they also have potential for identifying readvance. A multidisciplinary approach is likely to provide the strongest evidence for or against a smaller-than-present AIS in the Holocene.

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          Space geodesy constrains ice age terminal deglaciation: The global ICE-6G_C (VM5a) model

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            The link between climate warming and break-up of ice shelves in the Antarctic Peninsula

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              Validity of the temperature reconstruction from water isotopes in ice cores

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                Author and article information

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                Journal
                The Cryosphere
                The Cryosphere
                Copernicus GmbH
                1994-0424
                2022
                May 03 2022
                : 16
                : 5
                : 1543-1562
                Article
                10.5194/tc-16-1543-2022
                624b7790-6ada-4a66-a4c7-1dd258340408
                © 2022

                https://creativecommons.org/licenses/by/4.0/

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                Self URI (article page): https://tc.copernicus.org/articles/16/1543/2022/

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