Volume and velocity changes at Mittivakkat Gletscher, southeast Greenland

Mernild, S. H. and Knudsen, N. T. and Hoffman, M. J. and Yde, J. C. and Hanna, E. and Lipscomb, W. H. and Malmros, J. K. and Fausto, R. S. (2013) Volume and velocity changes at Mittivakkat Gletscher, southeast Greenland. Journal of Glaciology, 59 (216). pp. 660-670. ISSN 0022-1430

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Item Type:Article
Item Status:Live Archive

Abstract

We document changes for Mittivakkat Gletscher, the peripheral glacier in Greenland with the longest field-based observed mass-balance and surface velocity time series. Between 1986 and 2011, this glacier changed by -15 in mean ice thickness and -30 in volume. We attribute these changes to summer warming and lower winter snow accumulation. Vertical strain compensated for �60 of the elevation change due to surface mass balance (SMB) in the lower part, and �25 in the upper part. The annual mean ice surface velocity changed by -30, which can be fully explained by the dynamic effect of ice thinning, within uncertainty. Mittivakkat Gletscher summer surface velocities were on average 50-60 above winter background values, and up to 160 higher during peak velocity events. Peak velocity events were accompanied by uplift of a few centimeters.

Keywords:glacier dynamics, ice thickness, mass balance, snow accumulation, summer, time series, warming, winter, Ammassalik Island, Arctic, Greenland, Mittivakkat Glacier
Subjects:F Physical Sciences > F330 Environmental Physics
Divisions:College of Science > School of Geography
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ID Code:26017
Deposited On:23 Feb 2017 20:12

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