气候变化领域集成服务门户(CCPortal): Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting

CCPortal

DOI	10.5194/tc-14-3407-2020
	Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting
	Zhang T.; Price S.F.; Hoffman M.J.; Perego M.; Asay-Davis X.
发表日期	2020
ISSN	19940416
起始页码	3407
结束页码	3424
卷号	14 期号:10
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.
英文关键词	correlation; experiment; ice flow; ice shelf; ice thickness; melting; numerical model; perturbation
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202264
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
推荐引用方式 GB/T 7714	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],2020,14(10).
APA	Zhang T.,Price S.F.,Hoffman M.J.,Perego M.,&Asay-Davis X..(2020).Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting.Cryosphere,14(10).
MLA	Zhang T.,et al."Diagnosing the sensitivity of grounding-line flux to changes in sub-ice-shelf melting".Cryosphere 14.10(2020).