气候变化领域集成服务门户(CCPortal): Recent acceleration of Denman Glacier (1972-2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration

CCPortal

DOI	10.5194/tc-15-663-2021
	Recent acceleration of Denman Glacier (1972-2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
	Miles B.W.J.; Jordan J.R.; Stokes C.R.; Jamieson S.S.R.; Hilmar Gudmundsson G.; Jenkins A.
发表日期	2021
ISSN	19940416
起始页码	663
结束页码	676
卷号	15 期号:2
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.
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
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202384
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
推荐引用方式 GB/T 7714	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],2021,15(2).
APA	Miles B.W.J.,Jordan J.R.,Stokes C.R.,Jamieson S.S.R.,Hilmar Gudmundsson G.,&Jenkins A..(2021).Recent acceleration of Denman Glacier (1972-2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration.Cryosphere,15(2).
MLA	Miles B.W.J.,et al."Recent acceleration of Denman Glacier (1972-2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration".Cryosphere 15.2(2021).