Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting

Zhang, Tong; Price, Stephen F.; Hoffman, Matthew J.; Perego, Mauro; Asay-Davis, Xylar

doi:10.5194/tc-14-3407-2020

Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting

Journal Article · Fri Oct 16 00:00:00 EDT 2020 · The Cryosphere (Online)

DOI:https://doi.org/10.5194/tc-14-3407-2020· OSTI ID:2325357

Zhang, Tong; ; ; Perego, Mauro;

Abstract. Using a numerical ice flow model, we study changes in ice shelf buttressing and grounding-line flux due to localized ice thickness perturbations, a proxy for localized changes in sub-ice-shelf melting. From our experiments, applied to idealized (MISMIP+) and realistic (Larsen C) ice shelf domains, we identify a correlation between a locally derived buttressing number on the ice shelf, based on the first principal stress, and changes in the integrated grounding-line flux. The origin of this correlation, however, remains elusive from the perspective of a theoretical or physically based understanding. This and the fact that the correlation is generally much poorer when applied to realistic ice shelf domains motivate us to seek an alternative approach for predicting changes in grounding-line flux. We therefore propose an adjoint-based method for calculating the sensitivity of the integrated grounding-line flux to local changes in ice shelf geometry. We show that the adjoint-based sensitivity is identical to that deduced from pointwise, diagnostic model perturbation experiments. Based on its much wider applicability and the significant computational savings, we propose that the adjoint-based method is ideally suited for assessing grounding-line flux sensitivity to changes in sub-ice-shelf melting.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC). Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: 89233218CNA000001; AC02-05CH11231; AC04-94AL85000; AC52-06NA25396; NA0003525

OSTI ID:: 2325357

Alternate ID(s):: OSTI ID: 1725840
OSTI ID: 1734727

Report Number(s):: LA-UR--20-20381; SAND--2020-11416J

Journal Information:: The Cryosphere (Online), Journal Name: The Cryosphere (Online) Journal Issue: 10 Vol. 14; ISSN 1994-0424

Publisher:: Copernicus GmbHCopyright Statement

Country of Publication:: Germany

Language:: English

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