Observed eastward progression of the Fukushima 134Cs signal across the North Pacific
Macdonald, Alison M.
Jayne, Steven R.
Rypina, Irina I.
Buesseler, Ken O.
MetadataShow full item record
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.
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.
Suggested CitationGeophysical Research Letters 42 (2015): 7139–7147
Showing items related by title, author, creator and subject.
Desorption behavior of Fukushima-derived radiocesium in sand collected from Yotsukura Beach in Fukushima prefecture Nagao, Seiya; Terasaki, Soichiro; Ochiai, Shinya; Fukushi, Keisuke; Tomihara, Seiichi; Charette, Matthew A.; Buesseler, Ken O. (The Japan Society for Analytical Chemistry, 2020-05-10)Beach sand samples were collected along a coastal area 32 km south of the Fukushima Daiichi Nuclear Power Plant (FDNPP) in Fukushima Prefecture, Japan, 5 years after the FDNPP accident. Desorption experiments were performed ...
Baumann, Zofia; Fisher, Nicholas S.; Gobler, Christopher J.; Buesseler, Ken O.; George, J. A.; Breier, Crystaline F.; Nishikawa, Jun (2015-09-18)The potential bioaccumulation of 137Cs in marine food webs off Japan became a concern following the release of radioactive contaminants from the damaged Fukushima nuclear power plant into the coastal ocean. Previous ...
Cesium-134 and 137 activities in the central North Pacific Ocean after the Fukushima Dai-ichi Nuclear Power Plant accident Kamenik, J.; Dulaiova, Henrieta; Buesseler, Ken O.; Pike, Steven M.; Stastna, K. (Copernicus Publications on behalf of the European Geosciences Union, 2013-09-23)Surface seawater 134Cs and 137Cs samples were collected in the central and western North Pacific Ocean during the 2 yr after the Fukushima Dai-ichi Nuclear Power Plant accident to monitor dispersion patterns of these ...