Ice-shelf ocean boundary layer dynamics from large-eddy simulations

Begeman, Carolyn Branecky; Asay-Davis, Xylar; Van Roekel, Luke

doi:10.5194/tc-16-277-2022

Title: Ice-shelf ocean boundary layer dynamics from large-eddy simulations

Journal Article · Mon Jan 24 00:00:00 EST 2022 · The Cryosphere (Online)

DOI:https://doi.org/10.5194/tc-16-277-2022· OSTI ID:1841600

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Abstract. Small-scale turbulent flow below ice shelves is regionally isolated and difficult to measure and simulate. Yet these small-scale processes, which regulate heat and salt transfer between the ocean and ice shelves, can affect sea-level rise by altering the ability of Antarctic ice shelves to “buttress” ice flux to the ocean. In this study, we improve our understanding of turbulence below ice shelves by means of large-eddy simulations at sub-meter resolution, capturing boundary layer mixing at scales intermediate between laboratory experiments or direct numerical simulations and regional or global ocean circulation models. Our simulations feature the development of an ice-shelf ocean boundary layer through dynamic ice melting in a regime with low thermal driving, low ice-shelf basal slope, and strong shear driven by the geostrophic flow. We present a preliminary assessment of existing ice-shelf basal melt parameterizations adopted in single component or coupled ice-sheet and ocean models on the basis of a small parameter study. While the parameterized linear relationship between ice-shelf melt rate and far-field ocean temperature appears to be robust, we point out a little-considered relationship between ice-shelf basal slope and melting worthy of further study.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: 20210528CR; 20210289ER; 20180549ECR; 89233218CNA000001

OSTI ID:: 1841600

Alternate ID(s):: OSTI ID: 1855137

Report Number(s):: LA-UR-21-27878

Journal Information:: The Cryosphere (Online), Journal Name: The Cryosphere (Online) Vol. 16 Journal Issue: 1; ISSN 1994-0424

Publisher:: Copernicus GmbHCopyright Statement

Country of Publication:: Germany

Language:: English

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