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    Continuous summer export of nitrogen-rich organic matter from the Greenland Ice Sheet inferred by ultrahigh resolution mass spectrometry

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    Author's manuscript (897.1Kb)
    Supporting information (588.7Kb)
    Date
    2014-11
    Author
    Lawson, Emily C.  Concept link
    Bhatia, Maya P.  Concept link
    Wadham, Jemma L.  Concept link
    Kujawinski, Elizabeth B.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7138
    As published
    https://doi.org/10.1021/es501732h
    Abstract
    Runoff from glaciers and ice sheets has been acknowledged as a potential source of bioavailable dissolved organic matter (DOM) to downstream ecosystems. This source may become increasingly significant as glacial melt rates increase in response to future climate change. Recent work has identified significant concentrations of bioavailable carbon and iron in Greenland Ice Sheet (GrIS) runoff. The flux characteristics and export of N-rich DOM are poorly understood. Here, we employed electrospray ionization (ESI) coupled to Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to determine the elemental compositions of DOM molecules in supraglacial water and subglacial runoff from a large GrIS outlet glacier. We provide the first detailed temporal analysis of the molecular composition of DOM exported over a full melt season. We find that DOM pools in supraglacial and subglacial runoff are compositionally diverse and that N-rich material is continuously exported throughout the melt season as the snowline retreats further inland. Identification of protein-like compounds and a high proportion of N-rich DOM, accounting for 27-41% of the DOM molecules identified by ESI FT-ICR MS, may suggest a microbial provenance and high bioavailability of glacially-exported DOM to downstream microbial 16 communities.
    Description
    Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of American Chemical Society for personal use, not for redistribution. The definitive version was published in Environmental Science & Technology 48 (2014): 14248–14257, doi:10.1021/es501732h.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Lawson, Emily C., Bhatia, Maya P., Wadham, Jemma L., Kujawinski, Elizabeth B., "Continuous summer export of nitrogen-rich organic matter from the Greenland Ice Sheet inferred by ultrahigh resolution mass spectrometry", 2014-11, https://doi.org/10.1021/es501732h, https://hdl.handle.net/1912/7138
     
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