Access of surface meltwater to beds of sub-freezing glaciers: preliminary insights

被引：111

作者：

Alley, RB ^{[1
]}

Dupont, TK ^{[1
]}

Parizek, BR ^{[1
]}

Anandakrishnan, S ^{[1
]}

机构：

[1] Penn State Univ, Dept Geosci & EMS EESI, University Pk, PA 16802 USA

来源：

ANNALS OF GLACIOLOGY, VOL 40, 2005 | 2005年 / 40卷

关键词：

D O I：

10.3189/172756405781813483

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Sufficiently deep water-filled fractures can penetrate even cold ice-sheet ice, but glaciogenic stresses are typically smaller than needed to propagate water-filled fractures that are less than a few tens of meters deep, as shown by our simplified analytical treatment based on analogous models of magmatic processes. However, water-filled fractures are inferred to reach the bed of Greenland through > 1 km of ice and then collapse to form moulins, which are observed. Supraglacial lakes appear especially important among possible crack 'nucleation' mechanisms, because lakes can warm ice, supply water, and increase the pressure driving water flow and ice cracking.

引用

页码：8 / 14

页数：7

共 25 条

[1] ALLEY RB, IN PRESS GEOMORPHOLG
[2] The role of hydrologically-driven ice fracture in drainage system evolution on an Arctic glacier
Boon, S
Sharp, M
[J]. GEOPHYSICAL RESEARCH LETTERS, 2003, 30 (18) : CRY1 - 1
[3] DUPONT TK, 2005, ANN GLACIOL, V40
[4] Basal-crevasse-fill origin of laminated debris bands at Matanuska Glacier, Alaska, USA
Ensminger, SL
Alley, RB
Evenson, EB
Lawson, DE
Larson, GJ
[J]. JOURNAL OF GLACIOLOGY, 2001, 47 (158) : 412 - 422
[5] FRACTURE-TOUGHNESS OF ICE AND FIRN DETERMINED FROM THE MODIFIED RING TEST MODIFIED RING TEST
FISCHER, MP
ALLEY, RB
ENGELDER, T
[J]. JOURNAL OF GLACIOLOGY, 1995, 41 (138) : 383 - 394
[6] FOUNTAIN AG, 2005, ANN GLACIOL, V40
[7] HOOKE RL, 1998, PRINCIPLES GLACIER M
[8] BUOYANCY-DRIVEN FLUID FRACTURE - SIMILARITY SOLUTIONS FOR THE HORIZONTAL AND VERTICAL PROPAGATION OF FLUID-FILLED CRACKS
LISTER, JR
[J]. JOURNAL OF FLUID MECHANICS, 1990, 217 : 213 - 239
[9] Catastrophic ice-shelf break-up by an ice-shelf-fragment-capsize mechanism
MacAyeal, DR
Scambos, TA
Hulbe, CL
Fahnestock, MA
[J]. JOURNAL OF GLACIOLOGY, 2003, 49 (164) : 22 - 36
[10] Implications of increased Greenland surface melt under global-warming scenarios: ice-sheet simulations
Parizek, BR
Alley, RB
[J]. QUATERNARY SCIENCE REVIEWS, 2004, 23 (9-10) : 1013 - 1027

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