The DOE E3SM v1.2 Cryosphere Configuration: Description and Simulated Antarctic Ice‐Shelf Basal Melting

Comeau, Darin; Asay‐Davis, Xylar S.; Begeman, Carolyn Branecky; Hoffman, Matthew J.; Lin, Wuyin; Petersen, Mark R.; Price, Stephen F.; Roberts, Andrew F.; Van Roekel, Luke P.; Veneziani, Milena; Wolfe, Jonathan D.; Fyke, Jeremy G.; Ringler, Todd D.; Turner, Adrian K.

doi:10.1029/2021MS002468

Title: The DOE E3SM v1.2 Cryosphere Configuration: Description and Simulated Antarctic Ice‐Shelf Basal Melting

Journal Article · Thu Feb 10 00:00:00 EST 2022 · Journal of Advances in Modeling Earth Systems

DOI:https://doi.org/10.1029/2021MS002468· OSTI ID:1844450

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Computational Physics &, Methods Group (CCS‐2) Los Alamos National Laboratory Los Alamos NM USA
Fluid Dynamics &, Solid Mechanics Group (T‐3) Los Alamos National Laboratory Los Alamos NM USA
Brookhaven National Laboratory Upton NY USA
Fluid Dynamics &, Solid Mechanics Group (T‐3) Los Alamos National Laboratory Los Alamos NM USA, Canadian Centre for Climate Services Environment and Climate Change Canada Gatineau QC Canada
Fluid Dynamics &, Solid Mechanics Group (T‐3) Los Alamos National Laboratory Los Alamos NM USA, National Security Science Fellow U.S. House of Representatives Washington, DC WA USA

The processes responsible for freshwater flux from the Antarctic Ice Sheet (AIS) - ice-shelf basal melting and iceberg calving - are generally poorly represented in current Earth System Models (ESMs). Here we document the cryosphere configuration of the U.S. Department of Energy's Energy Exascale Earth System Model (E3SM) v1.2. This includes simulating Antarctic ice-shelf basal melting, which has been implemented through simulating the ocean circulation within static Antarctic ice-shelf cavities, allowing for the ability to calculate ice- shelf basal melt rates from the associated heat and freshwater fluxes. In addition, we added the capability to prescribe forcing from iceberg melt, allowing for realistic representation of the other dominant mass loss process from the AIS. In standard resolution simulations (using a non-eddying ocean) under pre-industrial climate forcing, we find high sensitivity of modeled ocean/ice shelf interactions to the ocean state, which can result in a transition to a high basal melt regime under the Filchner-Ronne Ice Shelf (FRIS), presenting a significant challenge to representing the ocean/ice shelf system in a coupled ESM. We show that inclusion of a spatially dependent parameterization of eddy-induced transport reduces biases in water mass properties on the Antarctic continental shelf. With these improvements, E3SM produces realistic ice-shelf basal melt rates across the continent that are generally within the range inferred from observations. The accurate representation of ice-shelf basal melting within a coupled ESM is an important step towards reducing uncertainties in projections of the Antarctic response to climate change and Antarctica's contribution to global sea-level rise.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0012704; AC02-05CH11231; 89233218CNA000001; OCE130007

OSTI ID:: 1844450

Alternate ID(s):: OSTI ID: 1842793; OSTI ID: 1844452; OSTI ID: 1862807

Report Number(s):: BNL-222673-2022-JAAM; LA-UR-21-20116; e2021MS002468

Journal Information:: Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Vol. 14 Journal Issue: 2; ISSN 1942-2466

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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