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    Observed eastward progression of the Fukushima 134Cs signal across the North Pacific

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    Date
    2015-09-09
    Author
    Yoshida, Sachiko  Concept link
    Macdonald, Alison M.  Concept link
    Jayne, Steven R.  Concept link
    Rypina, Irina I.  Concept link
    Buesseler, Ken O.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7642
    As published
    https://doi.org/10.1002/2015GL065259
    DOI
    10.1002/2015GL065259
    Keyword
     Fukushima tracer; Mode waters 
    Abstract
    Radionuclide samples taken as part of hydrographic surveys at 30°N in the North Pacific reveal that the easternmost edge of Fukushima-derived 134Cs observed at 174.3°W in 2012 had progressed eastward across the basin to 160.6°W by 2013. The 2013 30°N observations indicate surface 134Cs concentrations of 3–5 Bq/m3 between 160°E and 160°W, slightly lower concentrations west of 160°E and no detectable signal east of 160.6°W. Profile samples show 134Cs penetration to 500 m west of 180° with shoaling penetration depth toward to the east. The near-uniform vertical distribution of 137Cs between 152°W and 121.3°W in the top 500 m is indicative of trace amounts of radionuclides remaining from weapons testing. The physical processes responsible for the deep 134Cs penetration in the western Pacific appear to be related to distinct water mass subduction pathways; however, the timing and rapidity of deep penetration over the broad scales observed has yet to be clarified.
    Description
    Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7139–7147, doi:10.1002/2015GL065259.
    Collections
    • Physical Oceanography (PO)
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geophysical Research Letters 42 (2015): 7139–7147
     

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