Evidence for significant photochemical production of carbon monoxide by particles in coastal and oligotrophic marine waters
Citable URI
https://hdl.handle.net/1912/3606As published
https://doi.org/10.1029/2009GL041158DOI
10.1029/2009GL041158Keyword
Carbon monoxide; Particle photochemistry; SeawaterAbstract
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.
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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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Geophysical Research Letters 36 (2009): L23606Related items
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