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Title: The characteristics and formation of a high-arctic proglacial icing.
Authors: Hodgkins, Richard
Tranter, Martyn
Dowdeswell, Julian A.
Keywords: Proglacial
Icing
Aufeis
Naled
Hydraulic conductivity
Issue Date: 2004
Publisher: Published by Blackwell Publishing on behalf of Swedish Society for Anthropology and Geography.
Citation: HODGKINS, R., TRANTER, M and DOWDESWELL, J.A., 2004. The characteristics and formation of a high-arctic proglacial icing. Geografiska Annaler: Series A, Physical Geography, 86(3), pp.265- 275.
Abstract: Well-known from permafrost hydrology, icings (naled or Aufeis) are also frequently encountered at the margins of high-latitude glaciers. The morphology of a proglacial icing at Scott Turnerbreen in the Norwegian Arctic archipelago of Svalbard is described, and the process of formation is considered in detail. Ground thermal-regime modelling indicates an equilibrium permafrost depth of at least 200 m in the studied catchment, and it appears unlikely that groundwater contributes to icing formation. Meltwater flow through ice-marginal drainage channels is accompanied by estimated heat fluxes of up to about 190 W m−2, suggesting that stored meltwater may continue to percolate through thawed sub-channel sediments when surface runoff is absent during winter. A hydraulic conductivity of 6.9 × 10−3 m s−1 is implied, which is consistent with other studies of glacier drainage systems. The long residence time of winter-draining meltwater, and solute rejection by refreezing water, account for high observed concentrations of solute in interstitial water in the icing. It has often been asserted that the presence of a proglacial icing indicates that a glacier is polythermal. However, as Scott Turnerbeen is entirely non-temperate, the presence of an icing cannot always be treated as a reliable guide to the thermal regime of a glacier.
Description: This article is Restricted Access. It was published in the journal, Geografiska Annaler: Series A, Physical Geography [© 2008 Swedish Society for Anthropology and Geography]. The definitive version is available at http://www3.interscience.wiley.com/journal/118504788/home
URI: https://dspace.lboro.ac.uk/2134/3572
ISSN: 0435-3676
Appears in Collections:Closed Access (Geography)

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