DOI: 10.5194/tc-14-3407-2020
论文题名: Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting
作者: Zhang T. ; Price S.F. ; Hoffman M.J. ; Perego M. ; Asay-Davis X.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 10 起始页码: 3407
结束页码: 3424
语种: 英语
英文关键词: correlation
; experiment
; ice flow
; ice shelf
; ice thickness
; melting
; numerical model
; perturbation
英文摘要: 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 (MISMIPC) 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. © 2021 ASTM International. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164642
Appears in Collections: 气候变化与战略
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作者单位: Fluid Dynamics and Solid Mechanics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Center for Computing Research, Sandia National Laboratories, Albuquerque, NM 87185, United States
Recommended Citation:
Zhang T.,Price S.F.,Hoffman M.J.,et al. Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting[J]. Cryosphere,2020-01-01,14(10)