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dc.contributor.authorKienast, Markus
dc.contributor.authorHigginson, M. J.
dc.contributor.authorMollenhauer, Gesine
dc.contributor.authorEglinton, Timothy I.
dc.contributor.authorChen, Min-Te
dc.contributor.authorCalvert, Stephen E.
dc.date.accessioned2010-05-12T14:08:10Z
dc.date.available2010-05-12T14:08:10Z
dc.date.issued2005-05-27
dc.identifier.citationPaleoceanography 20 (2005): PA2009en_US
dc.identifier.urihttp://hdl.handle.net/1912/3435
dc.descriptionAuthor 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 Paleoceanography 20 (2005): PA2009, doi:10.1029/2004PA001081.en_US
dc.description.abstractThe bulk sedimentary nitrogen isotopic composition of two cores from nearby sites on the northern slope of the South China Sea (Site 17940 and Ocean Drilling Program (ODP) Site 1144) differs by up to >2‰ during the last glacial period. Given their close proximity, both core sites are located in the same biogeographic zone and nutrient regime, and it is thus unlikely that this offset is due to a true gradient in surface ocean conditions. In an attempt to resolve this offset, we have investigated the possible effects of two sedimentological parameters that can affect bulk sedimentary δ15N, namely, the variable contribution of inorganic N to bulk N in the sediment and the grain-size dependence of bulk δ15N. We find that neither effect, singly or in combination, is sufficient to explain the significant δ15N offset between the two down-core records. By elimination the most likely explanation for the observed discrepancy is a different origin of both the organic and inorganic nitrogen at each site. This study adds to the growing body of evidence highlighting the complex nature and origin of the sedimentary components in sediment drifts, such as ODP Site 1144.en_US
dc.description.sponsorshipFunding from NSERC Canada (to S.E.C. and M.K.) and NSF (OCE-0214365 and OCE-0318371 to M.J.H. and OCE-0327405 to T.I.E.) is gratefully acknowledged, as well as Woods Hole Oceanographic Institution Postdoctoral Fellowships (M.K. and G.M.), the Camille and Henry Dreyfus Postdoctoral Program in Environmental Chemistry (M.J.H.), and a Geological Society of America student research grant (M.K.).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttp://dx.doi.org/10.1029/2004PA001081
dc.subjectSediment driften_US
dc.subjectSouth China Seaen_US
dc.subjectNitrogen isotopesen_US
dc.titleOn the sedimentological origin of down-core variations of bulk sedimentary nitrogen isotope ratiosen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2004PA001081


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