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Rapid advance of two mountain glaciers in response to mine-related debris loading.

Jamieson, S.S.R. and Ewertowski, M.W. and Evans, D.J.A. (2015) 'Rapid advance of two mountain glaciers in response to mine-related debris loading.', Journal of geophysical research. Earth surface., 120 (7). pp. 1418-1435.

Abstract

Rapid glacier advance is known to occur by a range of mechanisms. However, although large-scale debris loading has been proposed as a process for causing rapid terminus advance, it has rarely been observed. We use satellite remote-sensing data to observe accelerated glacier terminus advance in response to massive supraglacial loading on two glaciers in Kyrgyzstan. Over a 15 year period, mining activity has led to the dumping of spoil of up to 180 m thick on large parts of these valley glaciers. We find that the termini of these glaciers advance by 1.2 and 3.2 km respectively at a rate of up to 350 m yr−1. Our analysis suggests that although enhanced basal sliding could be an important process, massive supraglacial loads have also caused enhanced internal ice deformation that would account for most, or all, of the glacier terminus advance. In addition, narrowing of the glacier valley and mining and dumping of ice alter the mass balance and flow regime of the glaciers. Although the scale of supraglacial loading is massive, this full-scale experiment provides insight into glacier flow acceleration response where small valley glaciers are impacted by very large volumes of landslide debris.

Item Type:Article
Keywords:Glacier advance, Debris-covered glacier, Supraglacial debris, Human impact, Mining, Ice deformation.
Full text:(AM) Accepted Manuscript
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Full text:(VoR) Version of Record
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1002/2015JF003504
Publisher statement:© 2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:25 June 2015
Date deposited:27 July 2015
Date of first online publication:20 July 2015
Date first made open access:No date available

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