气候变化领域集成服务门户(CCPortal): Fogwater deposition of radiocesium in the forested mountains of East Japan during the Fukushima Daiichi Nuclear Power Plant accident: A key process in regional radioactive contamination

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DOI	10.1016/j.atmosenv.2020.117339
	Fogwater deposition of radiocesium in the forested mountains of East Japan during the Fukushima Daiichi Nuclear Power Plant accident: A key process in regional radioactive contamination
	Imamura N.; Katata G.; Kajino M.; Kobayashi M.; Itoh Y.; Akama A.
发表日期	2020
ISSN	1352-2310
卷号	224
英文摘要	Because of limited environmental monitoring data, the regional-scale impact of the deposition of fogwater radiologically contaminated by the Fukushima Daiichi Nuclear Power Plant (F1NPP) accident remains unclear. To redress this situation, we present an observational report of the radiocesium concentration in fogwater and its deposition in a Japanese forest during the early stages of the F1NPP accident (March 2011). The data were acquired by using a passive collector to capture fogwater above the forest canopy on a monthly basis. In addition, the radiocesium concentrations in monthly throughfall and stemflow were measured under the canopies of four tree species. The 137Cs activity concentration in fogwater during the observational period was 45.8 Bq L−1, which was twice as high as that present in bulk precipitation. The ratio of 137Cs in throughfall to that in bulk precipitation (TF/BP ratio) ranged from 1.0 to 2.5. The high TF/BP ratios may have been caused by the high radiocesium concentration in fogwater deposition. Based on this assumption, we assessed the TF/BP ratio according to the 137Cs activity concentrations of throughfall and bulk precipitation measured in various mountainous regions in East Japan. Our results reveal that the TF/BP ratio is high at some sites and that it increases with elevation. Sites with a high TF/BP ratio were almost entirely situated in areas of fogwater deposition, as predicted by an atmospheric dispersion model. In addition, sites with a high TF/BP ratio were above the cloud base at the time when plumes with high atmospheric 137Cs activity concentrations passed through the areas. Thus, these measurements of radiocesium in fogwater during the early stages of the F1NPP accident provide evidence that fogwater with high radioactive contamination was deposited in the forested mountain areas of East Japan. Given the major impact of fogwater deposition of radiocesium, its role should be considered carefully to better understand radiocesium cycling in forest ecosystems. © 2020 Elsevier Ltd
关键词	Fukushima Daiichi Nuclear Power Plant accident Mountain forest Occult deposition Passive fogwater collector Radiocesium Throughfall
语种	英语
scopus关键词	Atmospheric movements; Contamination; Deposition; Ecosystems; Electric power system interconnection; Forestry; Landforms; Nuclear energy; Nuclear fuels; Nuclear power plants; Radioactivity; Fogwater; Fukushima Dai-ichi Nuclear Power Plant accidents; Mountain forests; Radiocesium; Throughfall; Nuclear reactor accidents; cesium 137; cesium isotope; concentration (composition); dispersion; forest canopy; mountain environment; nuclear power plant; pollutant transport; precipitation assessment; radioactive pollution; radionuclide; stemflow; throughfall; Article; atmospheric deposition; atmospheric dispersion; biogeochemical cycling; canopy; cloud; concentration (parameter); environmental monitoring; forest; Fukushima nuclear accident; Japan; plume; pollution monitoring; precipitation; priority journal; radioactive contamination; Fukushima [Tohoku]
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249295
作者单位	Department of Forest Soils, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan; Institute for Global Change Adaptation Science (ICAS), Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan; Meteorological Research Institute, Japan Meteorological Agency (JMA), 1-1 Nagamine, Tsukuba, Ibaraki 305-0052, Japan; Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan; Center for Forest Restoration and Radioecology, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan
推荐引用方式 GB/T 7714	Imamura N.,Katata G.,Kajino M.,et al. Fogwater deposition of radiocesium in the forested mountains of East Japan during the Fukushima Daiichi Nuclear Power Plant accident: A key process in regional radioactive contamination[J],2020,224.
APA	Imamura N.,Katata G.,Kajino M.,Kobayashi M.,Itoh Y.,&Akama A..(2020).Fogwater deposition of radiocesium in the forested mountains of East Japan during the Fukushima Daiichi Nuclear Power Plant accident: A key process in regional radioactive contamination.ATMOSPHERIC ENVIRONMENT,224.
MLA	Imamura N.,et al."Fogwater deposition of radiocesium in the forested mountains of East Japan during the Fukushima Daiichi Nuclear Power Plant accident: A key process in regional radioactive contamination".ATMOSPHERIC ENVIRONMENT 224(2020).