Hydrology and hydrochemistry of a deglaciating high-Arctic catchment, Svalbard

Rutter, Nick, Hodson, Andy, Irvine-Fynn, Tristram and Solås, Monica Kristensen (2011) Hydrology and hydrochemistry of a deglaciating high-Arctic catchment, Svalbard. Journal of Hydrology, 410 (1-2). pp. 39-50. ISSN 0022-1694

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Official URL: http://dx.doi.org/10.1016/j.jhydrol.2011.09.001

Abstract

The impact of deglaciation on contemporary hydrological and biogeochemical functioning in the Rieperbreen– Foxfonna catchment in western Svalbard was observed in 2007–2008. An overall negative mass balance was observed during 2007; mass loss was high below the equilibrium line altitude (ELA), but spatially patchy mass increases due to superimposed ice and firn were evident above the ELA. Runoff from above the ELA was almost exclusively routed through low gradient, hydraulically inefficient supraglacial flowpaths, which fed steeper, highly efficient supraglacial and englacial/subglacial channels downstream. As interaction with debris-rich environments (subglacial and proglacial) was minimal and transit times were rapid below the ELA, runoff from supraglacial sources had a low solute content. In addition, two further parallel hydrological pathways existed: snowmelt-fed springs emerging from the glacier’s contemporary marginal moraines, and multiple shallow intermittent streams within recent moraines throughout the glacier forefield and along its northern moraine flank. Runoff from these additional pathways flowed through highly reactive sediments composed of shale, carbonate and sandstones. Their intense chemical and physical weathering meant moraines were important sources of solute contribution to the catchment’s bulk runoff chemistry. Ecological succession at the glacier margin is therefore highly likely to be dependent upon nutrient acquisition by hydrological processes within moraines as the catchment undergoes deglaciation.

Item Type: Article
Uncontrolled Keywords: Glacier hydrology, Svalbard, deglaciation, hydrochemistry
Subjects: F100 Chemistry
F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography
Depositing User: Helen Pattison
Date Deposited: 20 Apr 2012 12:10
Last Modified: 30 Sep 2015 11:28
URI: http://nrl.northumbria.ac.uk/id/eprint/6355

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