气候变化领域集成服务门户(CCPortal): Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model)

CCPortal

DOI	10.5194/tc-8-2335-2014
	Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model)
	Larour E.; Utke J.; Csatho B.; Schenk A.; Seroussi H.; Morlighem M.; Rignot E.; Schlegel N.; Khazendar A.
发表日期	2014
ISSN	19940416
卷号	8 期号:6
英文摘要	We present a new data assimilation method within the Ice Sheet System Model (ISSM) framework that is capable of assimilating surface altimetry data from missions such as ICESat (Ice Cloud and land Elevation Satellite) into reconstructions of transient ice flow. The new method relies on algorithmic differentiation to compute gradients of objective functions with respect to model forcings. It is applied to the Northeast Greenland Ice Stream, where surface mass balance and basal friction forcings are temporally inverted, resulting in adjusted modeled surface heights that best fit existing altimetry. This new approach allows for a better quantification of basal and surface processes and a better understanding of the physical processes currently missing in transient ice-flow models to better capture the important intra- and interannual variability in surface altimetry. It also demonstrates that large spatial and temporal variability is required in model forcings such as surface mass balance and basal friction, variability that can only be explained by including more complex processes such as snowpack compaction at the surface and basal hydrology at the bottom of the ice sheet. This approach is indeed a first step towards assimilating the wealth of high spatial resolution altimetry data available from EnviSat, ICESat, Operation IceBridge and CryoSat-2, and that which will be available in the near future with the launch of ICESat-2. © Author(s) 2014.
学科领域	algorithm; basal flow; data assimilation; friction; glacial hydrology; ice flow; ice sheet; ICESat; mass balance; snowpack; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	algorithm; basal flow; data assimilation; friction; glacial hydrology; ice flow; ice sheet; ICESat; mass balance; snowpack; Arctic; Greenland; Greenland Ice Sheet
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/119998
作者单位	Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive MS 300-323, Pasadena, CA 91109-8099, United States; University of California Irvine, Department of Earth System Science, Croul Hall, Irvine, CA 92697-3100, United States; Argonne National Lab, Argonne, IL 60439, United States; Department of Geological Sciences, University at Buffalo, Buffalo, NY, United States
推荐引用方式 GB/T 7714	Larour E.,Utke J.,Csatho B.,et al. Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model)[J],2014,8(6).
APA	Larour E..,Utke J..,Csatho B..,Schenk A..,Seroussi H..,...&Khazendar A..(2014).Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model).Cryosphere,8(6).
MLA	Larour E.,et al."Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model)".Cryosphere 8.6(2014).