DOI: 10.5194/tc-8-827-2014
Scopus记录号: 2-s2.0-84900033645
论文题名: Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
作者: Cook S ; , Rutt I ; C ; , Murray T ; , Luckman A ; , Zwinger T ; , Selmes N ; , Goldsack A ; , James T ; D
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 3 起始页码: 827
结束页码: 841
语种: 英语
英文关键词: basal flow
; crevasse
; environmental response
; ice breakup
; pressure effect
; water depth
; water temperature
; Arctic
; Greenland
; Helheim Glacier
英文摘要: Calving is an important mass-loss process for many glaciers worldwide, and has been assumed to respond to a variety of environmental influences. We present a grounded, flowline tidewater glacier model using a physically-based calving mechanism, applied to Helheim Glacier, eastern Greenland. By qualitatively examining both modelled size and frequency of calving events, and the subsequent dynamic response, the model is found to realistically reproduce key aspects of observed calving behaviour. Experiments explore four environmental variables which have been suggested to affect calving rates: water depth in crevasses, basal water pressure, undercutting of the calving face by submarine melt and backstress from ice mélange. Of the four variables, only crevasse water depth and basal water pressure were found to have a significant effect on terminus behaviour when applied at a realistic magnitude. These results are in contrast to previous modelling studies, which have suggested that ocean temperatures could strongly influence the calving front. The results raise the possibility that Greenland outlet glaciers could respond to the recent trend of increased surface melt observed in Greenland more strongly than previously thought, as surface ablation can strongly affect water depth in crevasses and water pressure at the glacier bed. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74852
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: Glaciology Group, Geography Department, Swansea University, Swansea, SA2 8PP, United Kingdom; Department of Arctic Geology, University Centre in Svalbard (UNIS), Pb. 156, 9171 Longyearbyen, Norway; CSC IT Center for Science Ltd., P.O. Box 405, 02101 Espoo, Finland
Recommended Citation:
Cook S,, Rutt I,C,et al. Modelling environmental influences on calving at Helheim Glacier in eastern Greenland[J]. Cryosphere,2014-01-01,8(3)