DOI: 10.5194/tc-8-1561-2014
Scopus记录号: 2-s2.0-84939813566
论文题名: Dynamic response of Antarctic ice shelves to bedrock uncertainty
作者: Sun S ; , Cornford S ; L ; , Liu Y ; , Moore J ; C
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 4 起始页码: 1561
结束页码: 1576
语种: 英语
英文关键词: amplitude
; bedrock
; dynamic response
; geometry
; ice sheet
; noise
; sea level change
; topography
; uncertainty analysis
; Antarctica
; East Antarctica
英文摘要: Accurate and extensive bedrock geometry data is essential in ice sheet modelling. The shape of the bedrock on fine scales can influence ice sheet evolution, for example through the formation of pinning points that alter grounding line dynamics. Here we test the sensitivity of the BISICLES adaptive mesh ice sheet model to small-amplitude height fluctuations on different spatial scales in the bedrock topography provided by Bedmap2 in the catchments of Pine Island Glacier, the Amery Ice shelf and a region of East Antarctica including the Aurora Basin, Law Dome and Totten Glacier. We generate an ensemble of bedrock topographies by adding random noise to the Bedmap2 data with amplitude determined by the accompanying estimates of bedrock uncertainty. We find that the small-amplitude fluctuations result in only minor changes in the way these glaciers evolve. However, lower-frequency noise, with a broad spatial scale (over tens of kilometres) is more important than higher-frequency noise even when the features have the same height amplitudes and the total noise power is maintained. This is cause for optimism regarding credible sea level rise estimates with presently achievable density of thickness measurements. Pine Island Glacier and the region around Totten Glacier and Law Dome undergo substantial retreat and appear to be more sensitive to errors in bed topography than the Amery Ice shelf region which remains stable under the present-day observational data uncertainty. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74801
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: College of Global Change and Earth System Science, Beijing Normal University, Beijing, China; School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, United Kingdom; Arctic Centre, University of Lapland, PL122, 96100 Rovaniemi, Finland; Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala, 75236, Sweden
Recommended Citation:
Sun S,, Cornford S,L,et al. Dynamic response of Antarctic ice shelves to bedrock uncertainty[J]. Cryosphere,2014-01-01,8(4)