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    Intercalibration studies of short-lived thorium-234 in the water column and marine particles

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    0631.pdf (1.116Mb)
    Date
    2012-09
    Author
    Maiti, Kanchan  Concept link
    Buesseler, Ken O.  Concept link
    Pike, Steven M.  Concept link
    Benitez-Nelson, Claudia R.  Concept link
    Cai, Pinghe  Concept link
    Chen, Weifang  Concept link
    Cochran, Kirk  Concept link
    Dai, Minhan  Concept link
    Dehairs, Frank  Concept link
    Gasser, Beat  Concept link
    Kelly, Roger P.  Concept link
    Masqué, Pere  Concept link
    Miller, Lisa A.  Concept link
    Miquel, Juan Carlos  Concept link
    Moran, S. Bradley  Concept link
    Morris, Paul J.  Concept link
    Peine, Florian  Concept link
    Planchon, Frederic  Concept link
    Renfro, Alisha A.  Concept link
    Rutgers van der Loeff, Michiel M.  Concept link
    Santschi, Peter H.  Concept link
    Turnewitsch, Robert  Concept link
    Waples, James T.  Concept link
    Xu, Chen  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6631
    As published
    https://doi.org/10.4319/lom.2012.10.631
    DOI
    10.4319/lom.2012.10.631
    Abstract
    Intercomparision of 234Th measurements in both water and particulate samples was carried out between 15 laboratories worldwide, as a part of GEOTRACES inter-calibration program. Particulate samples from four different stations namely BATS (both shallow and deep) and shelf station (shallow) in Atlantic and SAFE (both shallow and deep) and Santa Barbara station (shallow) in Pacific were used in the effort. Particulate intercalibration results indicate good agreement between all the participating labs with data from all labs falling within the 95% confidence interval around the mean for most instances. Filter type experiments indicate no significant differences in 234Th activities between filter types and pore sizes (0.2-0.8 μm). The only exception are the quartz filters, which are associated with 10% to 20% higher 234Th activities attributed to sorption of dissolved 234Th. Flow rate experiments showed a trend of decreasing 234Th activities with increasing flow rates (2-9 L min-1) for > 51 μm size particles, indicating particle loss during the pumping process. No change in 234Th activities on small particles was observed with increasing flow-rates. 234Th intercalibration results from deep water samples at SAFe station indicate a variability of < 3% amongst labs while dissolved 234Th data from surface water at Santa Barbara Station show a less robust agreement, possibly due to the loss of 234Th from decay and large in-growth corrections as a result of long gap between sample collection and processing.
    Description
    Author Posting. © Association for the Sciences of Limnology and Oceanography, 2012. This article is posted here by permission of Association for the Sciences of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography: Methods 10 (2012): 631-644, doi:10.4319/lom.2012.10.631.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Limnology and Oceanography: Methods 10 (2012): 631-644
     
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