Extensive winter subglacial water storage beneath the Greenland Ice Sheet

被引：64

作者：

Chu, Winnie ^{[1
]}

Schroeder, Dustin M. ^{[2
]}

Seroussi, Helene ^{[3
]}

Creyts, Timothy T. ^{[1
]}

Palmer, Steven J. ^{[4
]}

Bell, Robin E. ^{[1
]}

机构：

[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[2] Stanford Univ, Dept Geophys, Sch Earth Energy & Environm Sci, Stanford, CA 94305 USA

[3] CALTECH, Jet Prop Lab, Pasadena, CA USA

[4] Univ Exeter, Coll Life & Environm Sci, Exeter, Devon, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 24期

基金：

美国国家科学基金会; 英国自然环境研究理事会;

关键词：

LAND-TERMINATING SECTOR; DRAINAGE SYSTEM; SURFACE MELTWATER; RADAR ATTENUATION; BASAL CONDITIONS; RUSSELL GLACIER; GROUNDING-ZONE; FLOW; MELT; EVOLUTION;

D O I：

10.1002/2016GL071538

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Surface meltwater that reaches the base of the Greenland Ice Sheet exerts a fundamental impact on ice flow, but observations of catchment-wide movement and distribution of subglacial water remain limited. Using radar-sounding data from two seasons, we identify the seasonal distribution of subglacial water in western Greenland. Our analysis provides evidence of widespread subglacial water storage beneath Greenland in the wintertime. The winter storage is located primarily on bedrock ridges with higher bed elevations in excess of 200 m. During the melt season water moves to the subglacial troughs. This inverse relationship with topography indicates that the material properties of the glacier bed strongly influence subglacial drainage development. Both the spatial variations in bed properties and the initial state of the subglacial hydrology system at the start of the melt season lead to differing glacier dynamical responses to surface melting across the Greenland Ice Sheet.

引用

页码：12484 / 12492

页数：9

共 79 条

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