Bathymetric Influences on Antarctic Ice-Shelf Melt Rates

Goldberg, D. N.; Smith, T. A.; Narayanan, S. K.; Heimbach, P.; Morlighem, M.

doi:10.1029/2020jc016370

Bathymetric Influences on Antarctic Ice-Shelf Melt Rates

Journal Article · Sat Oct 31 00:00:00 EDT 2020 · Journal of Geophysical Research. Oceans

DOI:https://doi.org/10.1029/2020jc016370· OSTI ID:1863257

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Univ. of Edinburgh, Scotland (United Kingdom)
Univ. of Texas, Austin, TX (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of California, Irvine, CA (United States)

Ocean bathymetry exerts a strong control on ice sheet-ocean interactions within Antarctic ice-shelf cavities, where it can limit the access of warm, dense water at depth to the underside of floating ice shelves. However, ocean bathymetry is challenging to measure within or close to ice-shelf cavities. It remains unclear how uncertainty in existing bathymetry datasets affect simulated sub-ice-shelf melt rates. In this work, we infer linear sensitivities of ice-shelf melt rates to bathymetric shape with grid-scale detail by means of the adjoint of an ocean general circulation model. Both idealized and realistic-geometry experiments of sub-ice-shelf cavities in West Antarctica reveal that bathymetry has a strong impact on melt in localized regions such as topographic obstacles to flow. Moreover, response of melt to bathymetric perturbation is found to be non-monotonic, with deepening leading to either increased or decreased melt depending on location. Our computational approach provides a comprehensive way of identifying regions, where refined knowledge of bathymetry is most impactful, and also where bathymetric errors have relatively little effect on modeled ice sheet-ocean interactions.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); Natural Environment Research Council (NERC); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1863257

Journal Information:: Journal of Geophysical Research. Oceans, Journal Name: Journal of Geophysical Research. Oceans Journal Issue: 11 Vol. 125; ISSN 2169-9275

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
Adjoint
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Ice shelf
Ocean model
ice‐ocean interaction

Bathymetric Influences on Antarctic Ice-Shelf Melt Rates

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