DOI: 10.5194/tc-14-2313-2020
论文题名: Lateral meltwater transfer across an Antarctic ice shelf
作者: Dell R. ; Arnold N. ; Willis I. ; Banwell A. ; Williamson A. ; Pritchard H. ; Orr A.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 7 起始页码: 2313
结束页码: 2330
语种: 英语
英文关键词: algorithm
; automation
; drainage
; ice shelf
; Landsat
; meltwater
; monitoring system
; surface water
英文摘要: Surface meltwater on ice shelves can exist as slush, it can pond in lakes or crevasses, or it can flow in surface streams and rivers. The collapse of the Larsen B Ice Shelf in 2002 has been attributed to the sudden drainage of 3000 surface lakes and has highlighted the potential for surface water to cause ice-shelf instability. Surface meltwater systems have been identified across numerous Antarctic ice shelves, although the extent to which these systems impact ice-shelf instability is poorly constrained. To better understand the role of surface meltwater systems on ice shelves, it is important to track their seasonal development, monitoring the fluctuations in surface water volume and the transfer of water across ice-shelf surfaces. Here, we use Landsat 8 and Sentinel-2 imagery to track surface meltwater across the Nivlisen Ice Shelf in the 2016-2017 melt season.We develop the Fully Automated Supraglacial-Water Tracking algorithm for Ice Shelves (FASTISh) and use it to identify and track the development of 1598 water bodies, which we classify as either circular or linear. The total volume of surface meltwater peaks on 26 January 2017 at 5:5-107 m3. At this time, 63% of the total volume is held within two linear surface meltwater systems, which are up to 27 km long, are orientated along the ice shelf's north-south axis, and follow the surface slope. Over the course of the melt season, they appear to migrate away from the grounding line, while growing in size and enveloping smaller water bodies. This suggests there is large-scale lateral water transfer through the surface meltwater system and the firn pack towards the ice-shelf front during the summer. © 2020 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164442
Appears in Collections: 气候变化与战略
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作者单位: Scott Polar Research Institute, Lensfield Road, Cambridge, CB2 1ER, United Kingdom; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309, United States
Recommended Citation:
Dell R.,Arnold N.,Willis I.,et al. Lateral meltwater transfer across an Antarctic ice shelf[J]. Cryosphere,2020-01-01,14(7)