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Multi-year water and surface energy budget of a high-latitude polythermal glacier : evidence for overwinter water storage in a dynamic subglacial reservoir.

Hodson, Andy J. and Kohler, Jack and Brinkhaus, Moana and Wynn, Peter M. (2005) Multi-year water and surface energy budget of a high-latitude polythermal glacier : evidence for overwinter water storage in a dynamic subglacial reservoir. Annals of Glaciology, 42 (1). pp. 42-46. ISSN 0260-3055

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Abstract

This paper examines the water budget and surface energy balance of a Svalbard glacier (midre Lovénbreen) over a 6 year period (1997-2002). Fresh-water yields are found to lie between 1.1 and 1.5 m a−1 and reflect variable amounts of glacier ice ablation (0.27 ± 0.15 m a−1) and more consistent amounts of snowmelt and summer precipitation (0.40 ± 0.10 and 0.49 ± 0.12 m respectively). Between 24% and 36% of the annual runoff is thought to pass through a subglacial drainage system. Although the site is heavily influenced by stable maritime air masses during the summer, surface melting is achieved largely by net shortwave radiation fluxes (74-100% of ablation). Water budget analysis shows that the annual runoff yields may be strongly influenced by water storage within the glacial system. Storage can occur over the winter period and force the early development of the subglacial drainage system during the following summer. Thus annual water fluxes from this glacier cannot be estimated from glacial mass-balance data alone and there is a need to assess the implications of overwinter storage for our understanding of glacial dynamics, annual fluvial process rates and mixing processes in Svalbard's fjords.

Item Type: Article
Journal or Publication Title: Annals of Glaciology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 28145
Deposited By: Dr. Peter Wynn
Deposited On: 11 Nov 2009 13:57
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:44
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/28145

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