DOI: 10.5194/tc-10-895-2016
Scopus记录号: 2-s2.0-84967201473
论文题名: Improved GRACE regional mass balance estimates of the Greenland ice sheet cross-validated with the input-output method
作者: Xu Z ; , Schrama E ; J ; O ; , Van Der Wal W ; , Van Den Broeke M ; , Enderlin E ; M
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 2 起始页码: 895
结束页码: 912
语种: 英语
英文关键词: climate modeling
; glacier mass balance
; GRACE
; ice sheet
; ice thickness
; ICESat
; least squares method
; runoff
; Arctic
; Greenland
; Greenland Ice Sheet
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75149
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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, United States
Recommended Citation:
Xu Z,, Schrama E,J,et al. Improved GRACE regional mass balance estimates of the Greenland ice sheet cross-validated with the input-output method[J]. Cryosphere,2016-01-01,10(2)