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    Evidence for significant photochemical production of carbon monoxide by particles in coastal and oligotrophic marine waters

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    2009GL041158.pdf (160.2Kb)
    Date
    2009-12-09
    Author
    Xie, Huixiang  Concept link
    Zafiriou, Oliver C.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3606
    As published
    https://doi.org/10.1029/2009GL041158
    DOI
    10.1029/2009GL041158
    Keyword
     Carbon monoxide; Particle photochemistry; Seawater 
    Abstract
    Carbon monoxide (CO) photoproduction from particulate and chromophoric dissolved organic matter (CDOM) was determined in seawater from open-ocean and coastal areas. In confirmatory tests, poisoned or non-poisoned filtered and unfiltered blue-water samples, were exposed to sunlight. CO photoproduction was 21–42% higher in the unfiltered than in the filtered samples. In a more thorough study utilizing concentrated particles prepared by 0.2-μm cross-flow filtration, samples containing varying levels of particles were irradiated under simulated solar radiation. Their CO photoproduction rates increased linearly with particle concentration factor. Particulate CO production was 11–35% of CDOM-based CO production. On an absorbed-photons basis, the former was 30–108% more efficient than the latter. This study suggests that in both coastal and blue waters these new-found particulate photoprocesses are of similar biogeochemical importance to the well-known CDOM photoproduction term.
    Description
    Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 36 (2009): L23606, doi:10.1029/2009GL041158.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geophysical Research Letters 36 (2009): L23606
     

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