Persistent flow acceleration within the interior of the Greenland ice sheet

被引：81

作者：

Doyle, Samuel H. ^{[1
]}

Hubbard, Alun ^{[1
]}

Fitzpatrick, Andrew A. W. ^{[1
]}

van As, Dirk ^{[2
]}

Mikkelsen, Andreas B. ^{[3
]}

Pettersson, Rickard ^{[4
]}

Hubbard, Bryn ^{[1
]}

机构：

[1] Aberystwyth Univ, Dept Geog & Earth Sci, Aberystwyth, Dyfed, Wales

[2] Geol Survey Denmark & Greenland, Copenhagen, Denmark

[3] Univ Copenhagen, Dept Geosci & Nat Resource Management, Copenhagen, Denmark

[4] Uppsala Univ, Uppsala, Sweden

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 03期

关键词：

Greenland Ice Sheet; Ice sheet dynamics; Global Positioning System; SUPRAGLACIAL LAKE; WEST GREENLAND; ABLATION ZONE; GLACIER FLOW; MELT; VELOCITY; DRAINAGE; KANGERLUSSUAQ; PRESSURE; SECTOR;

D O I：

10.1002/2013GL058933

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We present surface velocity measurements from a high-elevation site located 140km from the western margin of the Greenland ice sheet, and similar to 50km into its accumulation area. Annual velocity increased each year from 51.780.01myr(-1) in 2009 to 52.920.01myr(-1) in 2012a net increase of 2.2%. These data also reveal a strong seasonal velocity cycle of up to 8.1% above the winter mean, driven by seasonal melt and supraglacial lake drainage. Sole et al. (2013) recently argued that ice motion in the ablation area is mediated by reduced winter flow following the development of efficient subglacial drainage during warmer, faster, summers. Our data extend this analysis and reveal a year-on-year increase in annual velocity above the equilibrium line altitude, where despite surface melt increasing, it is still sufficiently low to hinder the development of efficient drainage under thick ice.

引用

页码：899 / 905

页数：7

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