The circum-Antarctic ice-shelves respond to a more positive Southern Annular Mode with regionally varied melting

Verfaillie, Deborah, Pelletier, Charles, Goosse, Hugues, Jourdain, Nicolas C., Bull, Christopher, Dalaiden, Quentin, Favier, Vincent, Fichefet, Thierry and Wille, Jonathan D. (2022) The circum-Antarctic ice-shelves respond to a more positive Southern Annular Mode with regionally varied melting. Communications Earth & Environment, 3 (1). p. 139. ISSN 2662-4435

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The Southern Hemisphere cryosphere has recently shown regionally-contrasted responses to climate change, in particular to the positive phases of the Southern Annular Mode. However, the understanding of the impacts of this mode on ice-shelf basal melt at a circum-Antarctic scale is still limited. Here, we performed idealized experiments with a pan-Antarctic regional ice-shelf cavity-resolving ocean—sea-ice model for different phases of the Southern Annular Mode. We show that positive phases lead to increased upwelling and subsurface ocean temperature and salinity close to ice shelves, while the opposite occurs for negative phases. A one-standard-deviation increase of the Southern Annular Mode leads to a net basal mass loss of 40 Gt yr−1, with strong regional contrasts: increased ice-shelf basal melt in the Bellingshausen and Western Pacific sectors and the opposite response in the Amundsen sector. Estimates of 1000–1200 and 2090–2100 ice-shelf basal melt changes due to the Southern Annular Mode are −86.6 Gt yr−1 and 55.0 to 164.9 Gt yr−1, respectively, compared to the present.

Item Type: Article
Additional Information: Funding information: This work was funded through the PARAMOUR project “Decadal predictability and variability of polar climate: the role of atmosphere-ocean-cryosphere multiscale interactions” supported by the Fonds de la Recherche Scientifique-FNRS under Grant number O0100718F (EOS ID 30454083). C.B. and N.J. are supported by the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 820575 (TiPACCs). J.W. and V.F. acknowledge support from the Agence Nationale de la Recherche project ANR-20-CE01-0013 (ARCA).
Subjects: F700 Ocean Sciences
F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: John Coen
Date Deposited: 27 Jun 2022 14:29
Last Modified: 27 Jun 2022 14:30

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