Transport of organic carbon from the California coast to the slope region : a study of Δ14C and δ13C signatures of organic compound classes

dc.contributor.author Hwang, Jeomshik
dc.contributor.author Druffel, Ellen R. M.
dc.contributor.author Komada, Tomoko
dc.date.accessioned 2010-05-06T17:05:28Z
dc.date.available 2010-05-06T17:05:28Z
dc.date.issued 2005-05-05
dc.description Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 19 (2005): GB2018, doi:10.1029/2004GB002422. en_US
dc.description.abstract Surface sediments along a transect from an abyssal site in the northeastern Pacific (Station M, 34°50′N, 123°00′W) to a small mountainous river on the California coast (Santa Clara River) were studied to investigate the sources and cycling of organic matter on the continental margin. Sediment samples were separated into organic compound fractions (extractable lipids, amino acids (THAA), carbohydrates (TCHO), and the acid-insoluble fraction), and their carbon isotope ratios were measured. The Δ14C values of all the THAA and TCHO fractions were greater than −100‰, indicating relatively modern organic carbon (OC) source(s), and rapid cycling of these fractions. In contrast, the Δ14C values of extractable lipids and the acid-insoluble fraction were distinctly lower than those of the THAA and TCHO fractions. The Δ14C values of source OC to the sediments were estimated using a simple mixed layer model. These values were lower than the Δ14C signatures of pre-industrial plankton suggesting input of both old OC and contemporary plankton to the margin sediments. The source of old OC at the 2000-m site was likely from laterally transported coastal sediment. The estimated low Δ14C value of the transported OC suggests that old lipids and acid-insoluble material were selectively transported to the 2000-m site. The contribution of riverine POC to the margin sediments were estimated from Δ14C and δ13C values and indicate that relict OC exported by rivers was an important source of old lipids and acid-insoluble material to sedimentary OC on the shelf. en_US
dc.description.sponsorship This research was supported by NSF OCE Chemical Oceanography Program and ACS Petroleum Research Fund (to E. R. M. D.), the UCOP Marine Science Fellowship Program (to J. H.), and the Dreyfus Foundation for an Environmental Science Postdoctoral Fellowship grant (to T. K.). en_US
dc.format.mimetype application/pdf
dc.identifier.citation Global Biogeochemical Cycles 19 (2005): GB2018 en_US
dc.identifier.doi 10.1029/2004GB002422
dc.identifier.uri https://hdl.handle.net/1912/3398
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri https://doi.org/10.1029/2004GB002422
dc.subject Lateral transport en_US
dc.subject Organic matter en_US
dc.subject Radiocarbon en_US
dc.title Transport of organic carbon from the California coast to the slope region : a study of Δ14C and δ13C signatures of organic compound classes en_US
dc.type Article en_US
dspace.entity.type Publication
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relation.isAuthorOfPublication.latestForDiscovery 22c0b7a8-20af-432d-ba92-293c59d40646
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