DOI: 10.1002/grl.50527
论文题名: Time-variable gravity observations of ice sheet mass balance: Precision and limitations of the GRACE satellite data
作者: Velicogna I. ; Wahr J.
刊名: Geophysical Research Letters
ISSN: 0094-8897
EISSN: 1944-8628
出版年: 2013
卷: 40, 期: 12 起始页码: 3055
结束页码: 3063
语种: 英语
英文关键词: ice mass balance
; sea level
; time variable gravity
Scopus关键词: Antarctic ice sheets
; Antarctic Peninsula
; Glacial isostatic adjustment
; Gravity Recovery and Climate Experiment missions
; Ice mass
; Spherical harmonics
; Time-dependent signals
; Time-variable gravity
; Errors
; Estimation
; Geodetic satellites
; Glacial geology
; Glaciers
; Sea level
; Uncertainty analysis
; Gravitation
; correction
; error analysis
; GRACE
; ice sheet
; mass balance
; precision
; satellite data
; sea level
; Antarctica
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Time-variable gravity data from the Gravity Recovery and Climate Experiment (GRACE) mission have been available since 2002 to estimate the mass balance of the Greenland and Antarctic Ice Sheets. We analyze current progress and uncertainties in GRACE estimates of ice sheet mass balance. We discuss the impacts of errors associated with spherical harmonic truncation, spatial averaging, temporal sampling, and leakage from other time-dependent signals (e.g., glacial isostatic adjustment (GIA)). The largest sources of error for Antarctica are the GIA correction, the omission of l=1 terms, nontidal changes in ocean mass, and measurement errors. For Greenland, the errors come mostly from the uncertainty in the scaling factor. Using Release 5.0 (RL05) GRACE fields for January 2003 through November 2012, we find a mass change of -258 - 41 Gt/yr for Greenland, with an acceleration of -31 - 6 Gt/yr2, and a loss that migrated clockwise around the ice sheet margin to progressively affect the entire periphery. For Antarctica, we report changes of -83 - 49 and -147 - 80 Gt/yr for two GIA models, with an acceleration of -12 - 9 Gt/yr 2 and a dominance from the southeast pacific sector of West Antarctica and the Antarctic Peninsula. Key Points Comprehensive review of error sources, their impact and how to deal with them Estimates ice sheet mass balance for latest, extended GRACE releases Rapid publication for input to IPCC AR5 ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880554296&doi=10.1002%2fgrl.50527&partnerID=40&md5=b5e89c4197bfdc781948f2b135527148
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6161
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth System Science, University of California Irvine, 226 Croul Hall, Irvine, CA, 92697-3100, United States
Recommended Citation:
Velicogna I.,Wahr J.. Time-variable gravity observations of ice sheet mass balance: Precision and limitations of the GRACE satellite data[J]. Geophysical Research Letters,2013-01-01,40(12).