ASHLEY, Kate; MCKAY, Robert; ETOURNEAU, Johan; JIMENEZ-ESPEJO, Francisco; CONDRON, Alan; ALBOT, Anna; CROSTA, Xavier; RIESSELMAN, Christina; SEKI, Osamu; MASSÉ, Guillaume; GOLLEDGE, Nicholas; GASSON, Edward; LOWRY, Daniel; BARRAND, Nicholas; JOHNSON, Katelyn; BERTLER, Nancy; ESCUTIA, Carlota; DUNBAR, Robert; BENDLE, James

doi:10.5194/cp-17-1-2021

Langue

Article de revue

Ce document a été publié dans

Climate of the Past. 2021-01-05, vol. 17, p. 1 - 19

Résumé en anglais

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 multiproxy 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.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/188612

DOI

http://dx.doi.org/10.5194/cp-17-1-2021

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

Voir/Ouvrir

Métadonnées

Partager cette publication !

Licence d’utilisation du document

Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat

Langue

Ce document a été publié dans

Résumé en anglais

URI

DOI

Unités de recherche