DOI: 10.1038/ngeo2204
论文题名: Buoyant flexure and basal crevassing in dynamic mass loss at Helheim Glacier
作者: James T.D. ; Murray T. ; Selmes N. ; Scharrer K. ; O'Leary M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 8 起始页码: 593
结束页码: 596
语种: 英语
英文摘要: Iceberg calving accounts for a significant proportion of annual mass loss from marine-terminating glaciers and may have been a factor in the rapid demise of ancient ice sheets. The largest contributions from the main outlet glaciers of the Greenland ice sheet to sea-level rise over the next two centuries have been projected to be dynamic in origin, that is, driven by glacier flow and calving. However, present physical models remain a coarse approximation of real calving mechanisms because models are poorly constrained by sparse glacier geometry observations. Here we present a record of daily digital elevation models from the calving margin of Greenland's Helheim Glacier at a high spatial resolution. Our digital elevation models are derived from stereo terrestrial photography taken over the summers of 2010 and 2011. We find that during these two summers dynamic mass loss at Helheim Glacier was dominated by calving events exceeding 1 km 3 that were the result of buoyant flexure and the propagation of basal crevasses. We suggest that this buoyancy-driven mechanism for calving may be common elsewhere in Greenland and could be a first-order control on the ice sheet's future contribution to sea-level rise. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106622
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Glaciology Group, Department of Geography, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom
Recommended Citation:
James T.D.,Murray T.,Selmes N.,et al. Buoyant flexure and basal crevassing in dynamic mass loss at Helheim Glacier[J]. Nature Geoscience,2014-01-01,7(8)