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  Exploring the current and future stability of the Antarctic Ice Sheet

Reese, R., Garbe, J., Hill, E. A., Urruty, B., Naughten, K. A., Gagliardini, O., Durand, G., Gillet-Chaulet, F., Gudmundsson, G. H., Chandler, D., Langebroek, P. M., Winkelmann, R. (2023): Exploring the current and future stability of the Antarctic Ice Sheet, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4012

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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019839 Versions-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019839_2
Genre: Konferenzbeitrag

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 Urheber:
Reese, Ronja1, Autor
Garbe, Julius1, Autor
Hill, Emily A.1, Autor
Urruty, Benoit1, Autor
Naughten, Kaitlin A.1, Autor
Gagliardini, Olivier1, Autor
Durand, Gael1, Autor
Gillet-Chaulet, Fabien1, Autor
Gudmundsson, G. Hilmar1, Autor
Chandler, David1, Autor
Langebroek, Petra M.1, Autor
Winkelmann, Ricarda1, Autor
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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Schlagwörter: -
 Zusammenfassung: Observations of ocean-driven grounding line retreat in the Amundsen Sea Embayment in Antarctica raise the question of an imminent collapse of the West Antarctic Ice Sheet. Here we analyse (1) whether the Antarctic grounding lines are undergoing a Marine Ice Sheet Instability in their current position and (2) the committed evolution of Antarctic grounding lines under the present-day ocean and atmospheric conditions. To this aim, we first calibrate a sub-shelf melt parameterisation, that is derived from an ocean box model, with observed and modelled melt sensitivities to ocean temperature changes, making it suitable for present-day simulations and future sea-level projections. Using the new calibration, we conduct a systematic numerical stability analysis of all the grounding lines of the Antarctic Ice Sheet to determine if they are currently undergoing irreversible retreat. In a second step, we run an ensemble of historical simulations from 1850 to 2015 to create model instances of possible present-day ice sheet configurations. Then, we investigate the long-term ice sheet evolution and reversibility under constant bathymetry and present-day climate and ocean forcing.

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Sprache(n): eng - Englisch
 Datum: 2023
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.57757/IUGG23-4012
 Art des Abschluß: -

Veranstaltung

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Veranstaltungsort: Berlin
Start-/Enddatum: 2023-07-11 - 2023-07-20

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Genre der Quelle: Konferenzband
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Potsdam : GFZ German Research Centre for Geosciences
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