Photochemical reactivity of ancient marine dissolved organic carbon


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dc.contributor.author Beaupre, Steven R.
dc.contributor.author Druffel, Ellen R. M.
dc.date.accessioned 2012-11-01T19:48:22Z
dc.date.available 2013-03-20T08:45:32Z
dc.date.issued 2012-09-20
dc.identifier.citation Geophysical Research Letters 39 (2012): L18602 en_US
dc.identifier.uri http://hdl.handle.net/1912/5503
dc.description Author Posting. © American Geophysical Union, 2012. 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 39 (2012): L18602, doi:10.1029/2012GL052974. en_US
dc.description.abstract Marine dissolved organic carbon (DOC) is the largest reservoir of reduced carbon in seawater and persists up to 4,000–6,000 conventional radiocarbon (14C) years on average. Photochemical degradation has been suggested as a geochemical sink for these long-lived molecules, yet there have been no studies relating photochemical lability to the 14C-ages of surface DOC. We observed apparent second order (2°) kinetics with respect to DOC and a strong trend from Δ14C-enriched to depleted values during exhaustive photomineralization of surface marine DOC with high energy UV light. Geochemically, these results suggest that surface DOC is an isotopically-heterogeneous mixture of molecules for which photochemical lability and 14C ages are correlated. Photochemical mineralization may therefore be an important control on the persistence of 14C-depleted DOC in the ocean. en_US
dc.description.sponsorship This study was supported under NSF grant OCE-0961980 to E. R. M. Druffel. en_US
dc.format.mimetype application/msword
dc.format.mimetype text/plain
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2012GL052974
dc.subject DOC en_US
dc.subject Kinetics en_US
dc.subject Photochemistry en_US
dc.subject Radiocarbon en_US
dc.title Photochemical reactivity of ancient marine dissolved organic carbon en_US
dc.type Article en_US
dc.description.embargo 2013-03-20 en_US
dc.identifier.doi 10.1029/2012GL052974

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