DOI: 10.5194/tc-12-505-2018
Scopus记录号: 2-s2.0-85041724501
论文题名: Recent rift formation and impact on the structural integrity of the Brunt Ice Shelf, East Antarctica
作者: De Rydt J ; , Hilmar Gudmundsson G ; , Nagler T ; , Wuite J ; , King E ; C
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 2 起始页码: 505
结束页码: 520
语种: 英语
英文关键词: algorithm
; flow modeling
; formation mechanism
; ground-based measurement
; hindcasting
; ice flow
; ice shelf
; iceberg calving
; numerical model
; reactivation
; remote sensing
; rifting
; stress field
; Antarctica
; Brunt Ice Shelf
; East Antarctica
英文摘要: We report on the recent reactivation of a large rift in the Brunt Ice Shelf, East Antarctica, in December 2012 and the formation of a 50-km long new rift in October 2016. Observations from a suite of ground-based and remote sensing instruments between January 2000 and July 2017 were used to track progress of both rifts in unprecedented detail. Results reveal a steady accelerating trend in their width, in combination with alternating episodes of fast (> 600-mgdayg-1) and slow propagation of the rift tip, controlled by the heterogeneous structure of the ice shelf. A numerical ice flow model and a simple propagation algorithm based on the stress distribution in the ice shelf were successfully used to hindcast the observed trajectories and to simulate future rift progression under different assumptions. Results show a high likelihood of ice loss at the McDonald Ice Rumples, the only pinning point of the ice shelf. The nascent iceberg calving and associated reduction in pinning of the Brunt Ice Shelf may provide a uniquely monitored natural experiment of ice shelf variability and provoke a deeper understanding of similar processes elsewhere in Antarctica. © 2018 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75423
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: British Antarctic Survey, High Cross, Madingley Road, Cambridge, United Kingdom; ENVEO, ICT-Technologiepark, Technikerstr. 21a, Innsbruck, Austria; Geography and Environmental Sciences, Northumbria University, Newcastle, United Kingdom
Recommended Citation:
De Rydt J,, Hilmar Gudmundsson G,, Nagler T,et al. Recent rift formation and impact on the structural integrity of the Brunt Ice Shelf, East Antarctica[J]. Cryosphere,2018-01-01,12(2)