Ashley Kate E.

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Kate E.

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  • Article
    Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat
    (European Geosciences Union, 2021-01-05) Ashley, Kate E. ; McKay, Robert ; Etourneau, Johan ; Jimenez-Espejo, Francisco J. ; Condron, Alan ; Albot, Anna ; Crosta, Xavier ; Riesselman, Christina ; Seki, Osamu ; Massé, Guillaume ; Golledge, Nicholas ; Gasson, Edward ; Lowry, Daniel P. ; Barrand, Nicholas E. ; Johnson, Katelyn ; Bertler, Nancy ; Escutia, Carlota ; Dunbar, Robert B. ; Bendle, James A.
    Over recent decades Antarctic sea-ice extent has increased, alongside widespread ice shelf thinning and freshening of waters along the Antarctic margin. In contrast, Earth system models generally simulate a decrease in sea ice. Circulation of water masses beneath large-cavity ice shelves is not included in current Earth System models and may be a driver of this phenomena. We examine a Holocene sediment core off East Antarctica that records the Neoglacial transition, the last major baseline shift of Antarctic sea ice, and part of a late-Holocene global cooling trend. We provide a multi-proxy record of Holocene glacial meltwater input, sediment transport, and sea-ice variability. Our record, supported by high-resolution ocean modelling, shows that a rapid Antarctic sea-ice increase during the mid-Holocene (∼ 4.5 ka) occurred against a backdrop of increasing glacial meltwater input and gradual climate warming. We suggest that mid-Holocene ice shelf cavity expansion led to cooling of surface waters and sea-ice growth that slowed basal ice shelf melting. Incorporating this feedback mechanism into global climate models will be important for future projections of Antarctic changes.