title: Fukushima-derived radiocesium in the northwestern Pacific Ocean in February 2012.
abstract: We measured radiocesium ((134)Cs and (137)Cs) in seawaters collected at stations in the northwestern Pacific Ocean in February 2012. Activity concentration of Fukushima-derived radiocesium was highest in the transition area between the subarctic and subtropical regions, which was due to the direct discharge. The direct discharged radiocesium was transported southwardly across the Kuroshio Extension along isopycnal mixing. More than 80% of the Fukushima-derived radiocesium at stations both in the transition area and subtropical region was derived from the direct discharge.
authors.affiliation: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 2-15 Natushima-cho, Yokosuka, Kanagawa 237-0061, Japan. kumamoto@jamstec.go.jp
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Kumamoto
authors.forename: Akihiko
authors.initials: A
authors.lastname: Murata
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kawano
authors.forename: Michio
authors.initials: M
authors.lastname: Aoyama
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D062406:Fukushima Nuclear Accident; D007564:Japan; D010140:Pacific Ocean; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*; D011847:Radioactive Fallout / Q000032:analysis*; D012623:Seawater / Q000032:analysis* / Q000737:chemistry*; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D011847:Radioactive Fallout; D014875:Water Pollutants, Radioactive
keywords: (134)Cs; (137)Cs; The Fukushima Dai-ichi nuclear power plant; The northwestern Pacific Ocean