Chemical and isotopic switching within the subglacial environment of a high Arctic glacier.

Wynn, Peter M. and Hodson, Andrew and Heaton, Tim H. E. (2006) Chemical and isotopic switching within the subglacial environment of a high Arctic glacier. Biogeochemistry, 78 (2). pp. 173-193. ISSN 1573-515X

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Abstract

Natural environmental isotopes of nitrate, sulphate and inorganic carbon are discussed in conjunction with major ion chemistry of subglacial runoff from a High Arctic glacier, Midre Lovénbreen, Svalbard. The chemical composition of meltwaters is observed to switch in accordance with subglacial hydrological evolution and redox status. Changing rapidly from reducing to oxidizing conditions, subglacial waters also depict that 15N/14N values show microbial denitrification is an active component of nutrient cycling beneath the glacier. 18O/16O ratios of sulphate are used to elucidate mechanisms of biological and abiological sulphide oxidation. Concentrations of bicarbonate appear to be governed largely by the degree of rock:water contact encountered in the subglacial system, rather than the switch in redox status, although the potential for microbiological activity to influence ambient bicarbonate concentrations is recognised. Glaciers are therefore highlighted as cryospheric ecosystems supporting microbial life which directly impacts upon the release of solute through biogeochemically mediated processes.

Item Type: Journal Article
Journal or Publication Title: Biogeochemistry
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/ge
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 28096
Deposited By: Dr. Peter Wynn
Deposited On: 09 Nov 2009 10:27
Refereed?: Yes
Published?: Published
Last Modified: 19 Sep 2019 23:45
URI: https://eprints.lancs.ac.uk/id/eprint/28096

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