DOI: 10.1002/2015GL066612
论文题名: High basal melting forming a channel at the grounding line of Ross Ice Shelf, Antarctica
作者: Marsh O.J. ; Fricker H.A. ; Siegfried M.R. ; Christianson K. ; Nicholls K.W. ; Corr H.F.J. ; Catania G.
刊名: Geophysical Research Letters
ISSN: 0094-9515
EISSN: 1944-9246
出版年: 2016
卷: 43, 期: 1 起始页码: 1
结束页码: 6
语种: 英语
英文关键词: ice shelf channels
; phase-sensitive radar
; Whillans Ice Stream
Scopus关键词: Glacial geology
; Melting
; Radar
; Radar measurement
; Channel formation
; Ice shelves
; Ice streams
; Oceanic conditions
; Phase sensitive
; Ross ice shelves
; Subglacial hydrology
; Subglacial waters
; Ice
; basal melting
; channelization
; discharge
; drainage
; glacial hydrology
; grounding line
; ice shelf
; laser method
; radar
; subglacial environment
; Antarctic Ice Sheet
; Antarctica
; Kamb Ice Stream
; Mercer Ice Stream
; Ross Ice Shelf
; West Antarctic Ice Sheet
; West Antarctica
; Whillans Ice Stream
英文摘要: Antarctica's ice shelves are thinning at an increasing rate, affecting their buttressing ability. Channels in the ice shelf base unevenly distribute melting, and their evolution provides insight into changing subglacial and oceanic conditions. Here we used phase-sensitive radar measurements to estimate basal melt rates in a channel beneath the currently stable Ross Ice Shelf. Melt rates of 22.2 ± 0.2 m a-1 (>2500% the overall background rate) were observed 1.7 km seaward of Mercer/Whillans Ice Stream grounding line, close to where subglacial water discharge is expected. Laser altimetry shows a corresponding, steadily deepening surface channel. Two relict channels to the north suggest recent subglacial drainage reorganization beneath Whillans Ice Stream approximately coincident with the shutdown of Kamb Ice Stream. This rapid channel formation implies that shifts in subglacial hydrology may impact ice shelf stability. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84957727795&doi=10.1002%2f2015GL066612&partnerID=40&md5=1e9018f893defa68ade242af93215326
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10478
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Institute for Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States
Recommended Citation:
Marsh O.J.,Fricker H.A.,Siegfried M.R.,et al. High basal melting forming a channel at the grounding line of Ross Ice Shelf, Antarctica[J]. Geophysical Research Letters,2016-01-01,43(1).