气候变化领域集成服务门户(CCPortal): Reassessment of the radiocesium resuspension flux from contaminated ground surfaces in eastern Japan

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DOI	10.5194/acp-22-783-2022
	Reassessment of the radiocesium resuspension flux from contaminated ground surfaces in eastern Japan
	Kajino, Mizuo; Watanabe, Akira; Ishizuka, Masahide; Kita, Kazuyuki; Zaizen, Yuji; Kinase, Takeshi; Hirai, Rikuya; Konnai, Kakeru; Saya, Akane; Iwaoka, Kazuki; Shiroma, Yoshitaka; Hasegawa, Hidenao; Akata, Naofumi; Hosoda, Masahiro; Tokonami, Shinji; Igarashi, Yasuhito
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	783
结束页码	803
卷号	22 期号:2 页码:21
英文摘要	Resuspension of Cs-137 from the contaminated ground surface to the atmosphere is essential for understanding the environmental behaviors of Cs-137 and estimating external and inhalation exposure of residents. Kajino et al. (2016) assessed the Cs-137 resuspension flux from bare soil and forest ecosystems in eastern Japan in 2013 using a numerical simulation constrained by surface air concentration measurements. However, the simulation was found to underestimate the observed deposition amounts by 2 orders of magnitude. The reason for this underestimation is that the simulation assumed that resuspended Cs-137 is carried by submicron aerosols, which have low deposition rates. Based on the observational indications that soil dust and bioaerosols are the major carriers of resuspended Cs-137, a new simulation is performed with higher deposition rates constrained by both surface concentrations and deposition amounts. In the new estimation, the total areal annual resuspension of Cs-137 in 2013 is 25.7 TBq, which is equivalent to 0.96 % of the initial deposition (2.68 PBq). Due to the rapid deposition rates, the annual redeposition amount is also large at 10.6 TBq, approximately 40 % of the resuspended Cs-137. The resuspension rate through the atmosphere (0.96 % yr(-1)) seems slow, but it (2.6 x 10(-5) d(-1)) may not be negligibly small compared to the actual decreasing trend of the ambient gamma dose rate obtained in Fukushima Prefecture after the radioactive decay of Cs-137 plus Cs-134 in 2013 is subtracted (1.0-7.9 x 10(-4) d(-1)): resuspension can account for 1 %-10 % of the decreasing rate due to decontamination and natural decay through land surface processes. The current simulation underestimated the Cs-137 deposition in Fukushima city in winter by more than an order of magnitude, indicating the presence of additional resuspension sources. The site of Fukushima city is surrounded by major roads. Heavy traffic on wet and muddy roads after snow removal operations could generate superlarge (approximately 100 mu m in diameter) road dust or road salt particles, which are not included in the model but might contribute to the observed Cs-137 at the site.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000747081800001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273346
作者单位	Japan Meteorological Agency; Hirosaki University; University of Tsukuba; Fukushima University; Kagawa University; Ibaraki University; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); University of Tsukuba; University of Tokyo; National Institutes for Quantum Science & Technology; University of the Ryukyus; Kyoto University
推荐引用方式 GB/T 7714	Kajino, Mizuo,Watanabe, Akira,Ishizuka, Masahide,et al. Reassessment of the radiocesium resuspension flux from contaminated ground surfaces in eastern Japan[J],2022,22(2):21.
APA	Kajino, Mizuo.,Watanabe, Akira.,Ishizuka, Masahide.,Kita, Kazuyuki.,Zaizen, Yuji.,...&Igarashi, Yasuhito.(2022).Reassessment of the radiocesium resuspension flux from contaminated ground surfaces in eastern Japan.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(2),21.
MLA	Kajino, Mizuo,et al."Reassessment of the radiocesium resuspension flux from contaminated ground surfaces in eastern Japan".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.2(2022):21.