气候变化领域集成服务门户(CCPortal): Simulating ice thickness and velocity evolution of Upernavik Isstrøm 1849-2012 by forcing prescribed terminus positions in ISSM

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DOI	10.5194/tc-12-1511-2018
	Simulating ice thickness and velocity evolution of Upernavik Isstrøm 1849-2012 by forcing prescribed terminus positions in ISSM
	Haubner K.; Box J.E.; Schlegel N.J.; Larour E.Y.; Morlighem M.; Solgaard A.M.; Kjeldsen K.K.; Larsen S.H.; Rignot E.; Dupont T.K.; Kjær K.H.
发表日期	2018
ISSN	19940416
卷号	12 期号:4
英文摘要	Tidewater glacier velocity and mass balance are known to be highly responsive to terminus position change. Yet it remains challenging for ice flow models to reproduce observed ice margin changes. Here, using the Ice Sheet System Model (ISSM; Larour et al. 2012), we simulate the ice velocity and thickness changes of Upernavik Isstrøm (north-western Greenland) by prescribing a collection of 27 observed terminus positions spanning 164 years (1849-2012). The simulation shows increased ice velocity during the 1930s, the late 1970s and between 1995 and 2012 when terminus retreat was observed along with negative surface mass balance anomalies. Three distinct mass balance states are evident in the reconstruction: (1849-1932) with near zero mass balance, (1932-1992) with ice mass loss dominated by ice dynamical flow, and (1998-2012), when increased retreat and negative surface mass balance anomalies led to mass loss that was twice that of any earlier period. Over the multi-decadal simulation, mass loss was dominated by thinning and acceleration responsible for 70 % of the total mass loss induced by prescribed change in terminus position. The remaining 30 % of the total ice mass loss resulted directly from prescribed terminus retreat and decreasing surface mass balance. Although the method can not explain the cause of glacier retreat, it enables the reconstruction of ice flow and geometry during 1849-2012. Given annual or seasonal observed terminus front positions, this method could be a useful tool for evaluating simulations investigating the effect of calving laws. © 2018 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License.
学科领域	glacier mass balance; ice flow; ice margin; ice retreat; ice thickness; iceberg calving; reconstruction; simulation; tidewater glacier; velocity profile; Arctic; Greenland
语种	英语
scopus关键词	glacier mass balance; ice flow; ice margin; ice retreat; ice thickness; iceberg calving; reconstruction; simulation; tidewater glacier; velocity profile; Arctic; Greenland
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/119168
作者单位	Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark; Centre for GeoGenetics, Natural History Museum, University of Copenhagen, Copenhagen, Denmark; Jet Propulsion Laboratory (JPL), California Institute of Technology, Pasadena, CA, United States; Department of Earth System Science, University of California-Irvine, Irvine, CA, United States; DTU Space - National Space Institute, Technical University of Denmark, Department of Geodesy, Kgs. Lyngby, Denmark; Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Department of Geology An Environmental Earth Science, Miami University, Oxford, OH, United States
推荐引用方式 GB/T 7714	Haubner K.,Box J.E.,Schlegel N.J.,et al. Simulating ice thickness and velocity evolution of Upernavik Isstrøm 1849-2012 by forcing prescribed terminus positions in ISSM[J],2018,12(4).
APA	Haubner K..,Box J.E..,Schlegel N.J..,Larour E.Y..,Morlighem M..,...&Kjær K.H..(2018).Simulating ice thickness and velocity evolution of Upernavik Isstrøm 1849-2012 by forcing prescribed terminus positions in ISSM.Cryosphere,12(4).
MLA	Haubner K.,et al."Simulating ice thickness and velocity evolution of Upernavik Isstrøm 1849-2012 by forcing prescribed terminus positions in ISSM".Cryosphere 12.4(2018).