Hysteresis of the Antarctic Ice Sheet With a Coupled Climate-Ice-Sheet Model

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-03-03 DOI:10.1029/2024GL111492

G. Leloup, A. Quiquet, D. M. Roche, C. Dumas, D. Paillard

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引用次数: 0

Abstract

The stability of the Antarctic ice sheet under different fixed ${CO}_{2}$ levels and orbital configurations is explored using a coupled climate-ice sheet model, starting from either a pre-industrial ice sheet or an ice-free, isostatically rebounded geometry. Simulations reveal a strong hysteresis effect: equilibrium ice volumes differ significantly for equivalent ${CO}_{2}$ levels, depending on the initial ice sheet geometry. Crucially, the albedo-melt feedback is accounted for in our coupled setting, resulting in a nonlinear response of the ice sheet to the ${CO}_{2}$ forcing. Critical ${CO}_{2}$ thresholds trigger either the complete Antarctic ice sheet loss or near-complete regrowth. The orbital configuration influences these ${CO}_{2}$ thresholds. These findings highlight the importance of ice sheet-atmosphere interactions, notably the albedo-melt feedback, in projecting future long-term ice sheet behavior. Neglecting these feedbacks could lead to an overestimation of ${CO}_{2}$ thresholds for ice sheet destabilization, with implications for future long-term sea level rise under high emission scenarios.

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.