Paleofluvial Mega-Canyon Beneath the Central Greenland Ice Sheet

被引：58

作者：

Bamber, Jonathan L. ^{[1
]}

Siegert, Martin J. ^{[1
]}

Griggs, Jennifer A. ^{[1
]}

Marshall, Shawn J. ^{[2
]}

Spada, Giorgio ^{[3
]}

机构：

[1] Univ Bristol, Bristol Glaciol Ctr, Bristol BS8 1SS, Avon, England

[2] Univ Calgary, Dept Geog, Calgary, AB T2N 1N4, Canada

[3] Univ Urbino, Dipartimento Sci Base & Fondamenti, I-61029 Urbino, Italy

来源：

SCIENCE | 2013年 / 341卷 / 6149期

基金：

英国自然环境研究理事会;

关键词：

BASAL MELT; GLACIER;

D O I：

10.1126/science.1239794

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：

Subglacial topography plays an important role in modulating the distribution and flow of basal water. Where topography predates ice sheet inception, it can also reveal insights into former tectonic and geomorphological processes. Although such associations are known in Antarctica, little consideration has been given to them in Greenland, partly because much of the ice sheet bed is thought to be relatively flat and smooth. Here, we present evidence from ice-penetrating radar data for a 750-km-long subglacial canyon in northern Greenland that is likely to have influenced basal water flow from the ice sheet interior to the margin. We suggest that the mega-canyon predates ice sheet inception and will have influenced basal hydrology in Greenland over past glacial cycles.

引用

页码：997 / 999

页数：3

共 19 条

[1] History of the Greenland Ice Sheet: paleoclimatic insights [J].

Alley, Richard B. ;

Andrews, J. T. ;

Brigham-Grette, J. ;

Clarke, G. K. C. ;

Cuffey, K. M. ;

Fitzpatrick, J. J. ;

Funder, S. ;

Marshall, S. J. ;

Miller, G. H. ;

Mitrovica, J. X. ;

Muhs, D. R. ;

Otto-Bliesner, B. L. ;

Polyak, L. ;

White, J. W. C. .

QUATERNARY SCIENCE REVIEWS, 2010, 29 (15-16) :1728-1756

[2] A new bed elevation dataset for Greenland [J].

Bamber, J. L. ;

Griggs, J. A. ;

Hurkmans, R. T. W. L. ;

Dowdeswell, J. A. ;

Gogineni, S. P. ;

Howat, I. ;

Mouginot, J. ;

Paden, J. ;

Palmer, S. ;

Rignot, E. ;

Steinhage, D. .

CRYOSPHERE, 2013, 7 (02) :499-510

[3] Final closure of Panama and the onset of northern hemisphere glaciation [J].

Bartoli, G ;

Sarnthein, M ;

Weinelt, M ;

Erlenkeuser, H ;

Garbe-Schönberg, D ;

Lea, DW .

EARTH AND PLANETARY SCIENCE LETTERS, 2005, 237 (1-2) :33-44

[4] Gravity-inferred crustal thickness of Greenland [J].

Braun, Alexander ;

Kim, Hyung Rae ;

Csatho, Beata ;

von Frese, Ralph R. B. .

EARTH AND PLANETARY SCIENCE LETTERS, 2007, 262 (1-2) :138-158

[5]

Bull W.B., 1977, GEOMORPHOLOGY ARID R, P115

[6] Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations [J].

DahlJensen, D ;

Gundestrup, N ;

Gogineni, SP ;

Miller, H .

ANNALS OF GLACIOLOGY, VOL 37, 2003, 37 :207-212

[7]

DREWRY DJ, 1976, TECTONOPHYSICS, V36, P301, DOI 10.1016/0040-1951(76)90023-8

[8] Unusual surface morphology from digital elevation models of the Greenland ice sheet [J].

Ekholm, S ;

Keller, K ;

Bamber, JL ;

Gogineni, SP .

GEOPHYSICAL RESEARCH LETTERS, 1998, 25 (19) :3623-3626

[9] Subglacial floods beneath ice sheets [J].

Evatt, G. W. ;

Fowler, A. C. ;

Clark, C. D. ;

Hulton, N. R. J. .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2006, 364 (1844) :1769-1794

[10] High geothermal heat row, basal melt, and the origin of rapid ice how in central Greenland [J].

Fahnestock, M ;

Abdalati, W ;

Joughin, I ;

Brozena, J ;

Gogineni, P .

SCIENCE, 2001, 294 (5550) :2338-2342

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