DOI: 10.5194/tc-14-3209-2020
论文题名: Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves
作者: Berg B. ; Bassis J.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 9 起始页码: 3209
结束页码: 3213
语种: 英语
英文关键词: boundary condition
; buoyancy
; hydrostatics
; ice shelf
; numerical model
; simulation
; Stokes formula
英文摘要: The buoyancy boundary condition applied to floating portions of ice sheets and glaciers in Stokes models requires special consideration when the glacier rapidly departs from hydrostatic equilibrium. This boundary condition can manifest in velocity fields that are unphysically (and strongly) dependent on time step size, thereby contaminating diagnostic stress fields. This can be especially problematic for models of calving glaciers, where rapid changes in geometry cause configurations that suddenly depart from hydrostatic equilibrium and lead to inaccurate estimates of the stress field. Here we show that the unphysical behavior can be cured with minimal computational cost by reintroducing a regularization that corresponds to the acceleration term in the stress balance. This regularization provides consistent velocity solutions for all time step sizes. © 2018 Oxford University Press. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164405
Appears in Collections: 气候变化与战略
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作者单位: Physics Department, University of Michigan, Ann Arbor, MI, United States; Climate and Space Sciences and Engineering Department, University of Michigan, Ann Arbor, MI, United States
Recommended Citation:
Berg B.,Bassis J.. Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves[J]. Cryosphere,2020-01-01,14(9)