Thermomechanically coupled modelling for land-terminating glaciers: a comparison of two-dimensional, first-order and three-dimensional, full-Stokes approaches

doi:10.3189/2015J0G14J220

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	Thermomechanically coupled modelling for land-terminating glaciers: a comparison of two-dimensional, first-order and three-dimensional, full-Stokes approaches
	Zhang, Tong 1,2; Ju, Lili 1,2; Leng, Wei 3; Price, Stephen 4; Gunzburger, Max 5
	2015
发表期刊	JOURNAL OF GLACIOLOGY
ISSN	0022-1430
卷号	61 期号:228 页码:702-712
摘要	For many regions, glacier inaccessibility results in sparse geometric datasets for use as model initial conditions (e.g. along the central flowline only). In these cases, two-dimensional (2-D) flowline models are often used to study glacier dynamics. Here we systematically investigate the applicability of a 2-D, first-order Stokes approximation flowline model (FLM), modified by shape factors, for the simulation of land-terminating glaciers by comparing it with a 3-D, 'full'-Stokes ice-flow model (FSM). Based on steady-state and transient, thermomechanically uncoupled and coupled computational experiments, we explore the sensitivities of the FLM and FSM to ice geometry, temperature and forward model integration time. We find that, compared to the FSM, the FLM generally produces slower horizontal velocities, due to simplifications inherent to the FLM and to the underestimation of the shape factor. For polythermal glaciers, those with temperate ice zones, or when basal sliding is important, we find significant differences between simulation results when using the FLM versus the FSM. Over time, initially small differences between the FLM and FSM become much larger, particularly near cold/temperate ice transition surfaces. Long time integrations further increase small initial differences between the two models. We conclude that the FLM should be applied with caution when modelling glacier changes under a warming climate or over long periods of time.
关键词	glacier flow ice dynamics
DOI	10.3189/2015J0G14J220
语种	英语
资助项目	US Department of Energy, Office of Science, Advanced Scientific Computing Research and Biological and Environmental Research programs through the Scientific Discovery through Advanced Computing (SciDAC) project PISCEES ; US National Science Foundation[DMS-1215659] ; National 863 Project of China[2012AA01A309] ; National Center for Mathematics and Interdisciplinary Sciences of the Chinese Academy of Sciences
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000363002200008
出版者	INT GLACIOL SOC
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/20958
专题	中国科学院数学与系统科学研究院
通讯作者	Ju, Lili
作者单位	1.Univ S Carolina, Dept Math, Columbia, SC 29208 USA 2.Univ S Carolina, Interdisciplinary Math Inst, Columbia, SC 29208 USA 3.Chinese Acad Sci, State Key Lab Sci & Engn Comp, Beijing, Peoples R China 4.Los Alamos Natl Lab, Fluid Dynam & Solid Mech Grp, Los Alamos, NM USA 5.Florida State Univ, Dept Comp Sci, Tallahassee, FL 32306 USA
推荐引用方式 GB/T 7714	Zhang, Tong,Ju, Lili,Leng, Wei,et al. Thermomechanically coupled modelling for land-terminating glaciers: a comparison of two-dimensional, first-order and three-dimensional, full-Stokes approaches[J]. JOURNAL OF GLACIOLOGY,2015,61(228):702-712.
APA	Zhang, Tong,Ju, Lili,Leng, Wei,Price, Stephen,&Gunzburger, Max.(2015).Thermomechanically coupled modelling for land-terminating glaciers: a comparison of two-dimensional, first-order and three-dimensional, full-Stokes approaches.JOURNAL OF GLACIOLOGY,61(228),702-712.
MLA	Zhang, Tong,et al."Thermomechanically coupled modelling for land-terminating glaciers: a comparison of two-dimensional, first-order and three-dimensional, full-Stokes approaches".JOURNAL OF GLACIOLOGY 61.228(2015):702-712.