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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, Tong1,2; Ju, Lili1,2; Leng, Wei3; Price, Stephen4; Gunzburger, Max5
2015
Source PublicationJOURNAL OF GLACIOLOGY
ISSN0022-1430
Volume61Issue:228Pages:702-712
AbstractFor 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.
Keywordglacier flow ice dynamics
DOI10.3189/2015J0G14J220
Language英语
Funding ProjectUS 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 Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000363002200008
PublisherINT GLACIOL SOC
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.amss.ac.cn/handle/2S8OKBNM/20958
Collection中国科学院数学与系统科学研究院
Affiliation1.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
Recommended Citation
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.
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