DOI: 10.5194/tc-8-1725-2014
Scopus记录号: 2-s2.0-84907472539
论文题名: Time-evolving mass loss of the Greenland Ice Sheet from satellite altimetry
作者: Hurkmans R ; T ; W ; L ; , Bamber J ; L ; , Davis C ; H ; , Joughin I ; R ; , Khvorostovsky K ; S ; , Smith B ; S ; , Schoen N
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 5 起始页码: 1725
结束页码: 1740
语种: 英语
英文关键词: climate modeling
; CryoSat-2
; data set
; elevation
; firn
; gravimetry
; ice sheet
; input-output analysis
; radar
; satellite altimetry
; time series
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Mass changes of the Greenland Ice Sheet may be estimated by the input-output method (IOM), satellite gravimetry, or via surface elevation change rates (dH/dt). Whereas the first two have been shown to agree well in reconstructing ice-sheet wide mass changes over the last decade, there are few decadal estimates from satellite altimetry and none that provide a time-evolving trend that can be readily compared with the other methods. Here, we interpolate radar and laser altimetry data between 1995 and 2009 in both space and time to reconstruct the evolving volume changes. A firn densification model forced by the output of a regional climate model is used to convert volume to mass. We consider and investigate the potential sources of error in our reconstruction of mass trends, including geophysical biases in the altimetry, and the resulting mass change rates are compared to other published estimates. We find that mass changes are dominated by surface mass balance (SMB) until about 2001, when mass loss rapidly accelerates. The onset of this acceleration is somewhat later, and less gradual, compared to the IOM. Our time-averaged mass changes agree well with recently published estimates based on gravimetry, IOM, laser altimetry, and with radar altimetry when merged with airborne data over outlet glaciers. We demonstrate that, with appropriate treatment, satellite radar altimetry can provide reliable estimates of mass trends for the Greenland Ice Sheet. With the inclusion of data from CryoSat-2, this provides the possibility of producing a continuous time series of regional mass trends from 1992 onward. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74789
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: Bristol Glaciology Centre, School of Geographical Science, University of Bristol, Bristol, United Kingdom; Center for Geospatial Intelligence, University of Missouri, Columbia, MO, United States; Polar Science Center, University of Washington, Seattle, WA, United States; Nansen Environmental Remote Sensing Centre, Bergen, Norway; HKV Consultants, Lelystad, Netherlands
Recommended Citation:
Hurkmans R,T,W,et al. Time-evolving mass loss of the Greenland Ice Sheet from satellite altimetry[J]. Cryosphere,2014-01-01,8(5)