Show simple item record

dc.contributor.authorCrusius, John  Concept link
dc.contributor.authorKenna, Timothy C.  Concept link
dc.date.accessioned2007-05-02T17:47:02Z
dc.date.available2007-05-02T17:47:02Z
dc.date.issued2006-09-11
dc.identifier.urihttps://hdl.handle.net/1912/1603
dc.descriptionAuthor Posting. © The Author(s), 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Estuarine, Coastal and Shelf Science 71 (2007): 537-544, doi:10.1016/j.ecss.2006.09.006.en
dc.description.abstractSedimentary records of naturally occurring and fallout-derived radionuclides are widely used as tools for estimating both the ages of recent sediments and rates of sedimentation and bioturbation. Developing these records to the point of data interpretation requires careful sample collection, processing, analysis and data modeling. In this work, we document a number of potential pitfalls that can impact sediment core records and their interpretation. This paper is not intended as an exhaustive treatment of these potential problems. Rather, the emphasis is on potential problems that are not well documented in the literature, as follows: 1) The mere sampling of sediment cores at a resolution that is too coarse can result in an apparent diffusive mixing of the sedimentary record at rates comparable to diffusive bioturbation rates observed in many locations; 2) 210Pb profiles in slowly accumulating sediments can easily be misinterpreted to be driven by sedimentation, when in fact bioturbation is the dominant control. Multiple isotopes of different half lives and/or origin may help to distinguish between these two possible interpretations; 3) Apparent mixing can occur due simply to numerical artifacts inherent in the finite difference approximations of the advection diffusion equation used to model sedimentation and bioturbation. Model users need to be aware of this potential problem. Solutions to each of these potential pitfalls are offered to ensure the best possible sediment age estimates and/or sedimentation and bioturbation rates can be obtained.en
dc.description.sponsorshipThanks to the U.S. Geological Survey Coastal and Marine Geology Program, the Andrew F. Mellon Foundation, the Earth Institute Postdoctoral Fellowship Program at Columbia University, and the National Science Foundation for funding.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.relation.urihttps://doi.org/10.1016/j.ecss.2006.09.006
dc.subjectBioturbationen
dc.subjectRadioisotopesen
dc.subjectChronostratigraphyen
dc.subjectSediment mixingen
dc.subjectGeochronometryen
dc.subjectFallouten
dc.subjectLead 210en
dc.subjectCaesiumen
dc.subjectSediment mixingen
dc.subjectModellingen
dc.titleEnsuring confidence in radionuclide-based sediment chronologies and bioturbation ratesen
dc.typePreprinten


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record