Massive subsurface ice formed by refreezing of ice-shelf melt ponds

被引：65

作者：

Hubbard, Bryn ^{[1
]}

Luckman, Adrian ^{[2
]}

Ashmore, David W. ^{[1
]}

Bevan, Suzanne ^{[2
]}

Kulessa, Bernd ^{[2
]}

Munneke, Peter Kuipers ^{[2
]}

Philippe, Morgane ^{[3
]}

Jansen, Daniela ^{[4
]}

Booth, Adam ^{[5
]}

Sevestre, Heidi ^{[6
]}

Tison, Jean-Louis ^{[3
]}

O'Leary, Martin ^{[2
]}

Rutt, Ian ^{[2
]}

机构：

[1] Aberystwyth Univ, Dept Geog & Earth Sci, Ctr Glaciol, Aberystwyth SY23 3DB, Dyfed, Wales

[2] Swansea Univ, Dept Geog, Glaciol Grp, Swansea SA2 8PP, W Glam, Wales

[3] Univ Libre Bruxelles, Lab Glaciol, Dept Geosci Environm & Soc, B-1050 Brussels, Belgium

[4] Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, D-27568 Bremerhaven, Germany

[5] Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England

[6] Univ Ctr Svalbard, Dept Arctic Geol, N-9171 Longyearbyen, Norway

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

英国自然环境研究理事会;

关键词：

ANTARCTIC PENINSULA; SURFACE; BOREHOLE; STABILITY; GLACIER; CLIMATE; BALANCE; WATER;

D O I：

10.1038/ncomms11897

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Surface melt ponds form intermittently on several Antarctic ice shelves. Although implicated in ice-shelf break up, the consequences of such ponding for ice formation and ice-shelf structure have not been evaluated. Here we report the discovery of a massive subsurface ice layer, at least 16 km across, several kilometres long and tens of metres deep, located in an area of intense melting and intermittent ponding on Larsen C Ice Shelf, Antarctica. We combine borehole optical televiewer logging and radar measurements with remote sensing and firn modelling to investigate the layer, found to be similar to 10 degrees C warmer and B170 kgm(-3) denser than anticipated in the absence of ponding and hitherto used in models of ice-shelf fracture and flow. Surface ponding and ice layers such as the one we report are likely to form on a wider range of Antarctic ice shelves in response to climatic warming in forthcoming decades.

引用

页数：6

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