Th-234 sorption and export models in the water column : a review


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dc.contributor.author Savoye, Nicolas
dc.contributor.author Benitez-Nelson, Claudia R.
dc.contributor.author Burd, Adrian B.
dc.contributor.author Cochran, J. Kirk
dc.contributor.author Charette, Matthew A.
dc.contributor.author Buesseler, Ken O.
dc.contributor.author Jackson, George A.
dc.contributor.author Roy-Barman, Matthieu
dc.contributor.author Schmidt, Sabine
dc.contributor.author Elskens, Marc
dc.date.accessioned 2006-06-28T16:29:41Z
dc.date.available 2006-06-28T16:29:41Z
dc.date.issued 2005-10-10
dc.identifier.uri http://hdl.handle.net/1912/1040
dc.description Author Posting. © The Authors, 2005. 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 Marine Chemistry 100 (2006): 234-249, doi:10.1016/j.marchem.2005.10.014. en
dc.description.abstract Over the past few decades, the radioisotope pair of 238U/234Th has been widely and increasingly used to describe particle dynamics and particle export fluxes in a variety of aquatic systems. The present paper is one of five review articles dedicated to 234Th. It is focused on the models associated with 234Th whereas the companion papers (same issue) are focused on present and future methodologies and techniques (Rutgers van der Loeff et al.), C/234Th ratios (Buesseler et al.), 234Th speciation (Santschi et al.) and present and future applications of 234Th (Waples et al.). In this paper, we review current 234Th scavenging models and discuss the relative importance of the non steady state and physical terms associated with the most commonly used model to estimate 234Th flux. Based on this discussion we recommend that for future work the use of models should be accompanied by a discussion of the effect that model and data uncertainty have on the model results. We also suggest that future field work incorporate repeat occupations of sample sites on time scales of 1-4 weeks in order to evaluate steady state versus non steady state estimates of 234Th export, especially during high flux events (> ca. 800 dpm m-2 d-1). Finally, knowledge of the physical oceanography of the study area is essential, particularly in ocean margins and in areas of established upwelling (e.g. Equatorial Pacific). These suggestions will greatly enhance the application of 234Th as a tracer of particle dynamics and flux in more complicated regimes. en
dc.description.sponsorship This paper grew out of discussion held at the “Future Applications of 234Th in Aquatic Systems” workshop held at Woods Hole Oceanographic Institution in August, 2004 (see: http://www.geol.sc.edu/cbnelson/Thmeeting/). We are grateful to the US National Science Foundation Chemical Oceanography Program (OCE 0354757) for its support of the workshop. We thank the US National Science Foundation, the National Oceanic and Atmospheric Administration and the Belgian Science Policy for their support of many of the field and modeling efforts described in this paper. en
dc.format.extent 2096326 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.relation.uri http://dx.doi.org/10.1016/j.marchem.2005.10.014
dc.subject Th-234 en
dc.subject Model en
dc.subject Scavenging en
dc.subject Export en
dc.subject Particle dynamics en
dc.title Th-234 sorption and export models in the water column : a review en
dc.type Preprint en

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