Lancaster EPrints

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

This is the latest version of this item.

[img]
Preview
PDF (Microsoft_Word_-_Chemical_and_Isotopic_switching_within_the_subglacial_environment_of_a_high_arctic_glacier_e-print.pdf)
Download (466Kb) | Preview

    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: Article
    Journal or Publication Title: Biogeochemistry
    Uncontrolled Keywords: Isotopes ; Microbial ; Redox status ; Subglacial
    Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    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: 26 Jul 2012 16:44
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/28096

    Available Versions of this Item

    • Chemical and isotopic switching within the subglacial environment of a high Arctic glacier. (deposited 09 Nov 2009 10:27)[Currently Displayed]

    Actions (login required)

    View Item