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    Identification of possible source markers in marine dissolved organic matter using ultrahigh resolution mass spectrometry

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    Author's draft (2.156Mb)
    Supplementary data (62.37Kb)
    Date
    2009-04-30
    Author
    Kujawinski, Elizabeth B.  Concept link
    Longnecker, Krista  Concept link
    Blough, Neil V.  Concept link
    Del Vecchio, Rossana  Concept link
    Finlay, Liam  Concept link
    Kitner, Joshua B.  Concept link
    Giovannoni, Stephen J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2897
    As published
    https://doi.org/10.1016/j.gca.2009.04.033
    Abstract
    Marine dissolved organic matter (DOM) is one of the most heterogeneous and largest pools of reactive carbon on earth, rivaling in mass the carbon in atmospheric carbon dioxide. Nevertheless, the molecular-level composition of marine DOM has eluded detailed description, impeding inquiry into the specific mechanisms that add or remove compounds from the DOM pool. Here we describe the molecular-level composition of C18-extracted DOM along an east-west transect of the North Atlantic Ocean. We examine the changes in DOM composition along this transect with ultrahigh resolution mass spectrometry and multivariate statistics. We use indicator species analysis (ISA) to identify possible source markers for photochemical degradation and heterotrophic bacterial metabolism. The inclusion of ISA in statistical evaluation of DOM mass spectral data allows investigators to determine the m/z values associated with significant changes in DOM composition. With this technique, we observe indicator m/z values in estuarine water that may represent components of terrestrially-derived chromophoric DOM subject to photo-chemical degradation. We also observe a unique set of m/z values in surface seawater and show that many of these are present in pure cultures of the marine α-proteobacterium Candidatus Pelagibacter ubique when grown in natural seawater. These findings indicate that a complex balance of abiotic and biotic processes controls the molecular composition of marine DOM to produce signatures that are characteristic of different environments.
    Description
    Author Posting. © Elsevier B.V., 2009. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Geochimica et Cosmochimica Acta 73 (2009): 4384-4399, doi:10.1016/j.gca.2009.04.033.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Kujawinski, Elizabeth B., Longnecker, Krista, Blough, Neil V., Del Vecchio, Rossana, Finlay, Liam, Kitner, Joshua B., Giovannoni, Stephen J., "Identification of possible source markers in marine dissolved organic matter using ultrahigh resolution mass spectrometry", 2009-04-30, https://doi.org/10.1016/j.gca.2009.04.033, https://hdl.handle.net/1912/2897
     
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