THOMAS, Elisabeth; ALLEN, Claire; ETOURNEAU, Johan; KING, Amy; SEVERI, Mirko; WINTON, Holly; MUELLER, Juliane; CROSTA, Xavier; PECK, Victoria

doi:10.3390/geosciences9120506

THOMAS, Elisabeth
British Antarctic Survey [BAS]

ALLEN, Claire
British Antarctic Survey [BAS]

ETOURNEAU, Johan

Environnements et Paléoenvironnements OCéaniques [EPOC]

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Article de revue

Ce document a été publié dans

Geosciences. 2019-12, vol. 9, n° 12, p. 506

Résumé en anglais

Dramatic changes in sea ice have been observed in both poles in recent decades. However, the observational period for sea ice is short, and the climate models tasked with predicting future change in sea ice struggle to capture the current Antarctic trends. Paleoclimate archives, from marine sedimentary records and coastal Antarctic ice cores, provide a means of understanding sea ice variability and its drivers over decadal to centennial timescales. In this study, we collate published records of Antarctic sea ice over the past 2000 years (2 ka). We evaluate the current proxies and explore the potential of combining marine and ice core records to produce multi-archive reconstructions. Despite identifying 92 sea ice reconstructions, the spatial and temporal resolution is only sufficient to reconstruct circum-Antarctic sea ice during the 20th century, not the full 2 ka. Our synthesis reveals a 90 year trend of increasing sea ice in the Ross Sea and declining sea ice in the Bellingshausen, comparable with observed trends since 1979. Reconstructions in the Weddell Sea, the Western Pacific and the Indian Ocean reveal small negative trends in sea ice during the 20th century (1900-1990), in contrast to the observed sea ice expansion in these regions since 1979.< Réduire

Mots clés en anglais

sea ice

Antarctica

paleoclimate

ice cores

marine sediments

URI

https://oskar-bordeaux.fr/handle/20.500.12278/187835

DOI

http://dx.doi.org/10.3390/geosciences9120506

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

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Antarctic Sea Ice Proxies from Marine and Ice Core Archives Suitable for Reconstructing Sea Ice over the past 2000 Years

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Résumé en anglais

Mots clés en anglais

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