Basal Drainage System Response to Increasing Surface Melt on the Greenland Ice Sheet
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Material Information

Title:
Basal Drainage System Response to Increasing Surface Melt on the Greenland Ice Sheet
Series Title:
Science Magazine Volume 341 Issue 777
Creator:
Meierbachtol, T.
Publisher:
American Association for the Advancement of Science
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Ice Sheets ( lcsh )
Greenland ( lcsh )
Meltwater ( lcsh )
Glaciers ( lcsh )

Notes

Abstract:
Surface meltwater reaching the bed of the Greenland ice sheet imparts a fundamental control on basal motion. Sliding speed depends on ice/bed coupling, dictated by the configuration and pressure of the hydrologic drainage system. In situ observations in a four-site transect containing 23 boreholes drilled to Greenland’s bed reveal basal water pressures unfavorable to water-draining conduit development extending inland beneath deep ice. This finding is supported by numerical analysis based on realistic ice sheet geometry. Slow meltback of ice walls limits conduit growth, inhibiting their capacity to transport increased discharge. Key aspects of current conceptual models for Greenland basal hydrology, derived primarily from the study of mountain glaciers, appear to be limited to a portion of the ablation zone near the ice sheet margin. ( English )

Record Information

Source Institution:
Florida International University
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Sea Level Rise