DOI: 10.5194/tc-7-119-2013
Scopus记录号: 2-s2.0-84873852712
论文题名: Calving on tidewater glaciers amplified by submarine frontal melting
作者: O'Leary M ; , Christoffersen P
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 1 起始页码: 119
结束页码: 128
语种: 英语
英文关键词: boundary condition
; crevasse
; finite element method
; iceberg calving
; melting
; numerical model
; temperature gradient
; tidewater glacier
; underwater environment
; water temperature
英文摘要: While it has been shown repeatedly that ocean conditions exhibit an important control on the behaviour of grounded tidewater glaciers, modelling studies have focused largely on the effects of basal and surface melting. Here, a finite-element model of stresses near the front of a tidewater glacier is used to investigate the effects of frontal melting on calving, independently of the calving criterion used. Applications of the stress model to idealized scenarios reveal that undercutting of the ice front due to frontal melting can drive calving at up to ten times the mean melt rate. Factors which cause increased frontal melt-driven calving include a strong thermal gradient in the ice, and a concentration of frontal melt at the base of the glacier. These properties are typical of both Arctic and Antarctic tidewater glaciers. The finding that frontal melt near the base is a strong driver of calving leads to the conclusion that water temperatures near the bed of the glacier are critically important to the glacier front, and thus the flow of the glacier. These conclusions are robust against changes in the basal boundary condition and the choice of calving criterion, as well as variations in the glacier size or level of crevassing. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75008
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: Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI, United States
Recommended Citation:
O'Leary M,, Christoffersen P. Calving on tidewater glaciers amplified by submarine frontal melting[J]. Cryosphere,2013-01-01,7(1)