DOI: 10.5194/tc-15-3229-2021
论文题名: Marine ice sheet experiments with the Community Ice Sheet Model
作者: Leguy G.R. ; Lipscomb W.H. ; Asay-Davis X.S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 7 起始页码: 3229
结束页码: 3253
语种: 英语
英文关键词: experiment
; ice sheet
; marine ecosystem
; numerical model
英文摘要: Ice sheet models differ in their numerical treatment of dynamical processes. Simulations of marine-based ice are sensitive to the choice of Stokes flow approximation and basal friction law and to the treatment of stresses and melt rates near the grounding line. We study the effects of these numerical choices on marine ice sheet dynamics in the Community Ice Sheet Model (CISM). In the framework of the Marine Ice Sheet Model Intercomparison Project 3d (MISMIP3d), we show that a depth-integrated, higher-order solver gives results similar to a 3D (Blatter-Pattyn) solver. We confirm that using a grounding line parameterization to approximate stresses in the grounding zone leads to accurate representation of ice sheet flow with a resolution of 1/42μkm, as opposed to 1/40.5μkm without the parameterization. In the MISMIP+ experimental framework, we compare different treatments of sub-shelf melting near the grounding line. In contrast to recent studies arguing that melting should not be applied in partly grounded cells, it is usually beneficial in CISM simulations to apply some melting in these cells. This suggests that the optimal treatment of melting near the grounding line can depend on ice sheet geometry, forcing, or model numerics. In both experimental frameworks, ice flow is sensitive to the choice of basal friction law. To study this sensitivity, we evaluate friction laws that vary the connectivity between the basal hydrological system and the ocean near the grounding line. CISM yields accurate results in steady-state and perturbation experiments at a resolution of 1/42μkm (arguably 4μkm) when the connectivity is low or moderate and 1/41μkm (arguably 2μkm) when the connectivity is strong. © Copyright: Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164737
Appears in Collections: 气候变化与战略
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作者单位: Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Leguy G.R.,Lipscomb W.H.,Asay-Davis X.S.. Marine ice sheet experiments with the Community Ice Sheet Model[J]. Cryosphere,2021-01-01,15(7)