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dc.contributor.authorKeigwin, Lloyd D.  Concept link
dc.contributor.authorGuilderson, Thomas P.  Concept link
dc.date.accessioned2010-06-16T13:37:40Z
dc.date.available2010-06-16T13:37:40Z
dc.date.issued2009-12-15
dc.identifier.citationPaleoceanography 24 (2009): PA4212en_US
dc.identifier.urihttps://hdl.handle.net/1912/3646
dc.descriptionAuthor 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 Paleoceanography 24 (2009): PA4212, doi:10.1029/2008PA001727.en_US
dc.description.abstractMost seafloor sediments are dated with radiocarbon, and the sediment is assumed to be zero-age (modern) when the signal of atmospheric testing of nuclear weapons is present (Fraction modern (Fm) > 1). Using a simple mass balance, we show that even with Fm > 1, half of the planktonic foraminifera at the seafloor can be centuries old, because of bioturbation. This calculation, and data from four core sites in the western North Atlantic indicate that, first, during some part of the Little Ice Age (LIA) there may have been more Antarctic Bottom Water than today in the deep western North Atlantic. Alternatively, bioturbation may have introduced much older benthic foraminifera into surface sediments. Second, paleo-based warming of Sargasso Sea surface waters since the LIA must lag the actual warming because of bioturbation of older and colder foraminifera.en_US
dc.description.sponsorshipThis work was funded in part by the Gary Comer Foundation and by NSF grant 0214144. A portion of this work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2008PA001727
dc.subjectRadiocarbonen_US
dc.subjectCore topen_US
dc.subjectBioturbationen_US
dc.titleBioturbation artifacts in zero-age sedimentsen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2008PA001727


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