DOI: 10.5194/tc-8-1445-2014
Scopus记录号: 2-s2.0-84931569128
论文题名: Recent ice dynamic and surface mass balance of Union Glacier in the West Antarctic ice sheet
作者: Rivera A ; , Zamora R ; , Uribe J ; A ; , Jaña R ; , Oberreuter J
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 4 起始页码: 1445
结束页码: 1456
语种: 英语
英文关键词: cryosphere
; glacier dynamics
; glacier mass balance
; glaciology
; ice flow
; ice sheet
; subglacial environment
; Antarctic Ice Sheet
; Antarctica
; Ellsworth Mountains
; Union Glacier
; West Antarctic Ice Sheet
; West Antarctica
英文摘要: HHere we present the results of a comprehensive glaciological investigation of Union Glacier (79°460 S/83°240 W) in theWest Antarctic Ice Sheet (WAIS), a major outlet glacier within the Ellsworth Mountains. Union Glacier flows into the Ronne Ice Shelf, where recent models have indicated the potential for significant grounding line zone (GLZ) migrations in response to changing climate and ocean conditions. To elaborate a glaciological base line that can help to evaluate the potential impact of this GLZ change scenario, we installed an array of stakes on Union Glacier in 2007. The stake network has been surveyed repeatedly for elevation, velocity, and net surface mass balance. The region of the stake measurements is in near-equilibrium, and ice speeds are 10 to 33ma-1. Ground-penetrating radars (GPR) have been used to map the subglacial topography, internal structure, and crevasse frequency and depth along surveyed tracks in the stake site area. The bedrock in this area has a minimum elevation of-858ma.s.l., significantly deeper than shown by BEDMAP2 data. However, between this deeper area and the local GLZ, there is a threshold where the subglacial topography shows a maximum altitude of 190 m. This subglacial condition implies that an upstream migration of the GLZ will not have strong effects on Union Glacier until it passes beyond this shallow ice pinning point. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74809
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: Centro de Estudios Científicos, P.O. Box 5110466, Valdivia, Chile; Departamento de Geografía, Universidad de Chile, P.O. Box 3387, Santiago, Chile; Instituto Antártico Chileno, Punta Arenas, Chile
Recommended Citation:
Rivera A,, Zamora R,, Uribe J,et al. Recent ice dynamic and surface mass balance of Union Glacier in the West Antarctic ice sheet[J]. Cryosphere,2014-01-01,8(4)