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

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    Savoye.pdf (1.999Mb)
    Date
    2005-10-10
    Author
    Savoye, Nicolas  Concept link
    Benitez-Nelson, Claudia R.  Concept link
    Burd, Adrian B.  Concept link
    Cochran, J. Kirk  Concept link
    Charette, Matthew A.  Concept link
    Buesseler, Ken O.  Concept link
    Jackson, George A.  Concept link
    Roy-Barman, Matthieu  Concept link
    Schmidt, Sabine  Concept link
    Elskens, Marc  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1040
    As published
    https://doi.org/10.1016/j.marchem.2005.10.014
    Keyword
     Th-234; Model; Scavenging; Export; Particle dynamics 
    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.
    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.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Savoye, Nicolas, Benitez-Nelson, Claudia R., Burd, Adrian B., Cochran, J. Kirk, Charette, Matthew A., Buesseler, Ken O., Jackson, George A., Roy-Barman, Matthieu, Schmidt, Sabine, Elskens, Marc, "Th-234 sorption and export models in the water column : a review", 2005-10-10, https://doi.org/10.1016/j.marchem.2005.10.014, https://hdl.handle.net/1912/1040
     

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