| 作者： | S. Sun, S. L. Cornford, Y. Liu, J. C. Moore |
| 作者单位： |
1College of Global Change and Earth System Science, Beijing Normal University, Beijing, China 2School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK |
| 刊名： | The Cryosphere, 2014, Vol.8 (4), pp.1561-1576 |
| 来源数据库： | Directory of Open Access Journals |
| DOI： | 10.5194/tc-8-1561-2014 |
| 原始语种摘要： | Accurate and extensive bedrock geometry data is essential in ice sheetmodelling. The shape of the bedrock on fine scales can influence ice sheetevolution, for example through the formation of pinning points that altergrounding line dynamics. Here we test the sensitivity of theBISICLESadaptive mesh ice sheet model to small-amplitude height fluctuations ondifferent spatial scales in the bedrock topography provided by Bedmap2 inthe catchments of Pine Island Glacier, the Amery Ice shelf and a region ofEast Antarctica including the Aurora Basin, Law Dome and Totten Glacier. Wegenerate an ensemble of bedrock topographies by adding random noise to theBedmap2 data with amplitude determined by the accompanying estimates ofbedrock uncertainty. We find that the small-amplitude fluctuations result... |