ISMIP6-based projections of ocean-forced Antarctic Ice Sheet evolution using the Community Ice Sheet Model

Lipscomb, William H.; Leguy, Gunter R.; Jourdain, Nicolas C.; Asay-Davis, Xylar; Seroussi, Hélène; Nowicki, Sophie

doi:10.5194/tc-15-633-2021

ISMIP6-based projections of ocean-forced Antarctic Ice Sheet evolution using the Community Ice Sheet Model

Journal Article · Wed Feb 10 00:00:00 EST 2021 · The Cryosphere (Online)

DOI:https://doi.org/10.5194/tc-15-633-2021· OSTI ID:1765068

; ; ; ; ;

Abstract. The future retreat rate for marine-based regions of the Antarctic Ice Sheet is one of the largest uncertainties in sea-level projections. The Ice Sheet Model Intercomparison Project for CMIP6 (ISMIP6) aims to improve projections and quantify uncertainties by running an ensemble of ice sheet models with atmosphere and ocean forcing derived from global climate models. Here, the Community Ice Sheet Model (CISM) is used to run ISMIP6-based projections of ocean-forced Antarctic Ice Sheet evolution. Using multiple combinations of sub-ice-shelf melt parameterizations and calibrations, CISM is spun up to steady state over many millennia. During the spin-up, basal friction parameters and basin-scale thermal forcing corrections are adjusted to optimize agreement with the observed ice thickness. The model is then run forward for 550 years, from 1950–2500, applying ocean thermal forcing anomalies from six climate models. In all simulations, the ocean forcing triggers long-term retreat of the West Antarctic Ice Sheet, especially in the Filchner–Ronne and Ross sectors. Mass loss accelerates late in the 21st century and then rises steadily for several centuries without leveling off. The resulting ocean-forced sea-level rise at year 2500 varies from about 150 to 1300 mm, depending on the melt scheme and ocean forcing. Further experiments show relatively high sensitivity to the basal friction law, moderate sensitivity to grid resolution and the prescribed collapse of small ice shelves, and low sensitivity to the stress-balance approximation. The Amundsen sector exhibits threshold behavior, with modest retreat under many parameter settings but complete collapse under some combinations of low basal friction and high thermal forcing anomalies. Large uncertainties remain, as a result of parameterized sub-shelf melt rates, simplified treatments of calving and basal friction, and the lack of ice–ocean coupling.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: European Research Commission (ERC); National Aeronautic and Space Administration (NASA); National Research Agency (ANR); National Science Foundation (NSF); USDOE; USDOE Office of Science (SC). Scientific Discovery through Advanced Computing (SciDAC)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1765068

Alternate ID(s):: OSTI ID: 1774431

Report Number(s):: LA-UR--20-20048

Journal Information:: The Cryosphere (Online), Journal Name: The Cryosphere (Online) Journal Issue: 2 Vol. 15; ISSN 1994-0424

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: Germany

Language:: English

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