气候变化领域集成服务门户(CCPortal): Improved GRACE regional mass balance estimates of the Greenland ice sheet cross-validated with the input-output method

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DOI	10.5194/tc-10-895-2016
	Improved GRACE regional mass balance estimates of the Greenland ice sheet cross-validated with the input-output method
	Xu Z.; Schrama E.J.O.; Van Der Wal W.; Van Den Broeke M.; Enderlin E.M.
发表日期	2016
ISSN	19940416
卷号	10 期号:2
英文摘要	In this study, we use satellite gravimetry data from the Gravity Recovery and Climate Experiment (GRACE) to estimate regional mass change of the Greenland ice sheet (GrIS) and neighboring glaciated regions using a least squares inversion approach. We also consider results from the input-output method (IOM). The IOM quantifies the difference between the mass input and output of the GrIS by studying the surface mass balance (SMB) and the ice discharge (D). We use the Regional Atmospheric Climate Model version 2.3 (RACMO2.3) to model the SMB and derive the ice discharge from 12 years of high-precision ice velocity and thickness surveys. We use a simulation model to quantify and correct for GRACE approximation errors in mass change between different subregions of the GrIS, and investigate the reliability of pre-1990s ice discharge estimates, which are based on the modeled runoff. We find that the difference between the IOM and our improved GRACE mass change estimates is reduced in terms of the long-term mass change when using a reference discharge derived from runoff estimates in several subareas. In most regions our GRACE and IOM solutions are consistent with other studies, but differences remain in the northwestern GrIS. We validate the GRACE mass balance in that region by considering several different GIA models and mass change estimates derived from data obtained by the Ice, Cloud and land Elevation Satellite (ICESat). We conclude that the approximated mass balance between GRACE and IOM is consistent in most GrIS regions. The difference in the northwest is likely due to underestimated uncertainties in the IOM solutions. © Author(s) 2016.
学科领域	climate modeling; glacier mass balance; GRACE; ice sheet; ice thickness; ICESat; least squares method; runoff; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	climate modeling; glacier mass balance; GRACE; ice sheet; ice thickness; ICESat; least squares method; runoff; 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/119653
作者单位	Faculty of Aerospace Engineering, Delft University of Technology, Delft, Netherlands; Institute for Marine and Atmospheric Research, Utrecht University (UU/IMAU), Utrecht, Netherlands; Climate Change Institute, School of Earth and Climate Science, University of Maine, Orono, ME 04469, United States
推荐引用方式 GB/T 7714	Xu Z.,Schrama E.J.O.,Van Der Wal W.,et al. Improved GRACE regional mass balance estimates of the Greenland ice sheet cross-validated with the input-output method[J],2016,10(2).
APA	Xu Z.,Schrama E.J.O.,Van Der Wal W.,Van Den Broeke M.,&Enderlin E.M..(2016).Improved GRACE regional mass balance estimates of the Greenland ice sheet cross-validated with the input-output method.Cryosphere,10(2).
MLA	Xu Z.,et al."Improved GRACE regional mass balance estimates of the Greenland ice sheet cross-validated with the input-output method".Cryosphere 10.2(2016).