DOI: 10.5194/tc-7-797-2013
Scopus记录号: 2-s2.0-84883288499
论文题名: Speedup and fracturing of George VI Ice Shelf, Antarctic Peninsula
作者: Holt T ; O ; , Glasser N ; F ; , Quincey D ; J ; , Siegfried M ; R
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 3 起始页码: 797
结束页码: 816
语种: 英语
英文关键词: altimetry
; environmental change
; ERS-1
; flow pattern
; fracture initiation
; global warming
; ice breakup
; ice margin
; ice shelf
; ICESat
; Landsat
; synthetic aperture radar
; vulnerability
; Antarctica
; George VI Ice Shelf
; West Antarctica
英文摘要: George VI Ice Shelf (GVIIS) is located on the Antarctic Peninsula, a region where several ice shelves have undergone rapid breakup in response to atmospheric and oceanic warming. We use a combination of optical (Landsat), radar (ERS 1/2 SAR) and laser altimetry (GLAS) datasets to examine the response of GVIIS to environmental change and to offer an assessment on its future stability. The spatial and structural changes of GVIIS (ca. 1973 to ca. 2010) are mapped and surface velocities are calculated at different time periods (InSAR and optical feature tracking from 1989 to 2009) to document changes in the ice shelf's flow regime. Surface elevation changes are recorded between 2003 and 2008 using repeat track ICESat acquisitions. We note an increase in fracture extent and distribution at the south ice front, ice-shelf acceleration towards both the north and south ice fronts and spatially varied negative surface elevation change throughout, with greater variations observed towards the central and southern regions of the ice shelf. We propose that whilst GVIIS is in no imminent danger of collapse, it is vulnerable to ongoing atmospheric and oceanic warming and is more susceptible to breakup along its southern margin in ice preconditioned for further retreat. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74953
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: Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth SY23 3DB, United Kingdom; School of Geography, University of Leeds, Leeds LS2 9JT, United Kingdom; Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, San Diego CA 92093, United States
Recommended Citation:
Holt T,O,, Glasser N,et al. Speedup and fracturing of George VI Ice Shelf, Antarctic Peninsula[J]. Cryosphere,2013-01-01,7(3)