DOI: 10.5194/tc-15-663-2021
论文题名: Recent acceleration of Denman Glacier (1972-2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
作者: Miles B.W.J. ; Jordan J.R. ; Stokes C.R. ; Jamieson S.S.R. ; Hilmar Gudmundsson G. ; Jenkins A.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 2 起始页码: 663
结束页码: 676
语种: 英语
英文关键词: catchment
; glacier advance
; grounding line
; ice flow
; iceberg calving
; sea level change
; thinning
; topography
; Antarctica
; Aurora Subglacial Basin
; East Antarctica
英文摘要: After Totten, Denman Glacier is the largest contributor to sea level rise in East Antarctica. Denman's catchment contains an ice volume equivalent to 1.5m of global sea level and sits in the Aurora Subglacial Basin (ASB). Geological evidence of this basin's sensitivity to past warm periods, combined with recent observations showing that Denman's ice speed is accelerating and its grounding line is retreating along a retrograde slope, has raised the prospect that its contributions to sea level rise could accelerate. In this study, we produce the first long-term (∼ 50 years) record of past glacier behaviour (ice flow speed, ice tongue structure and calving) and combine these observations with numerical modelling to explore the likely drivers of its recent change. We find a spatially widespread acceleration of the Denman system since the 1970s across both its grounded (17±4% acceleration; 1972-2017) and floating portions (36±5% acceleration; 1972-2017). Our numerical modelling experiments show that a combination of grounding line retreat, ice tongue thinning and the unpinning of Denman's ice tongue from a pinning point following its last major calving event are required to simulate an acceleration comparable with observations. Given its bed topography and the geological evidence that Denman Glacier has retreated substantially in the past, its recent grounding line retreat and ice flow acceleration suggest that it could be poised to make a significant contribution to sea level in the near future. © Author(s) 2021. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164762
Appears in Collections: 气候变化与战略
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作者单位: Department of Geography, Durham University, Durham, DH1 3LE, United Kingdom; Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom
Recommended Citation:
Miles B.W.J.,Jordan J.R.,Stokes C.R.,et al. Recent acceleration of Denman Glacier (1972-2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration[J]. Cryosphere,2021-01-01,15(2)