Distribution and dynamics of Greenland subglacial lakes

被引：59

作者：

Bowling, J. S. ^{[1
,2
]}

Livingstone, S. J. ^{[2
]}

Sole, A. J. ^{[2
]}

Chu, W. ^{[3
]}

机构：

[1] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England

[2] Univ Sheffield, Dept Geog, Sheffield S10 2TN, S Yorkshire, England

[3] Stanford Univ, Dept Geophys, Stanford, CA 94305 USA

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

英国自然环境研究理事会;

关键词：

ICE-SHEET; MELTWATER DRAINAGE; THWAITES GLACIER; BASAL CONDITIONS; GROUNDING-ZONE; THERMAL STATE; SHEAR-MARGIN; BENEATH; SURFACE; INVENTORY;

D O I：

10.1038/s41467-019-10821-w

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：

Few subglacial lakes have been identified beneath the Greenland Ice Sheet (GrIS) despite extensive documentation in Antarctica, where periodic release of water can impact ice flow. Here we present an ice-sheet-wide survey of Greenland subglacial lakes, identifying 54 candidates from airborne radio-echo sounding, and 2 lakes from ice-surface elevation changes. These range from 0.2-5.9 km in length, and are mostly distributed away from ice divides, beneath relatively slow-moving ice. Based on our results and previous observations, we suggest three zones of formation: stable lakes in northern and eastern regions above the Equilibrium Line Altitude (ELA) but away from the interior; hydrologically-active lakes near the ELA recharged by surface meltwater and; small, seasonally-active lakes below the ELA, which form over winter and drain during the melt season. These observations provide important constraints on the GrIS's basal thermal regime and help refine our understanding of the subglacial hydrological system.

引用

页数：11

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