134Cs and 137Cs in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan. Part two: estimation of 134Cs and 137Cs inventories in the North Pacific Ocean

Aoyama, Michio; Kajino, Mizuo; Tanaka, Taichu Y.; Sekiyama, T. T.; Tsumune, Daisuke; Tsubono, Takaki; Hamajima, Yasunori; Inomata, Yayoi; Gamo, Toshitaka

doi:10.1007/s10872-015-0332-2

Cited by 147 publications

(75 citation statements)

References 32 publications

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“…() clearly showed that direct releases started on 26 March 2011 using 131 I/ 137 Cs activity ratios, which varied much more before 26 March 2011 when the atmospheric deposition was the major source. The most recent estimations have revealed that 3–4 PBq of 134 Cs and 137 Cs were directly released into the ocean and 12–15 PBq of 134 Cs and 137 Cs were deposited on the surface seawater in the North Pacific (Aoyama et al ., ).…”

Section: Total Amount Of Fnpp–released Radioactive Cesiummentioning

confidence: 97%

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Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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This review summarizes the more than 70 papers published during the 4 years since the Fukushima Dai-ichi nuclear power plant accident that occurred on 11 March 2011, and details the radioactive cesium dispersion pattern in the North Pacific and adjacent seas. The total amount of Fukushima-derived radioactive cesium released into the North Pacific via atmospheric deposition and direct release, spatial and temporal changes in the Pacific coast around the accident site, and the concentration levels of radioactive cesium around the Japanese Islands, not only the Pacific coast but also in adjacent seas, such as Japan Sea, East China Sea are summarized. Based on observational data mostly obtained during 2 years since the accident, and simulation results, oceanic dispersion of radioactive cesium in the entire area of the North Pacific is described. The Fukushima-derived radioactive cesium dispersed eastward as surface water and extended to the eastern side of the North Pacific in 2014, and was also observed via a southward intrusion to subsurface waters as Subtropical Mode Water and Central Mode Water. The radioactive cesium movement related to mode water is important in terms of the circulation of cesium into the ocean interior. Some new technologies and techniques concerning emergency monitoring of radioactivity in the ocean environment are also reported, the effectiveness of which has been demonstrated by use in relation to the Fukushima accident.

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Section: Total Amount Of Fnpp–released Radioactive Cesiummentioning

confidence: 97%

“…Data were cited from Aoyama et al . (, ); Kaeriyama (); Kaeriyama et al . (); Kaeriyama (this study) and NRA ( http://radioactivity.nsr.go.jp/en/) [Colour figure can be viewed at wileyonlinelibrary.com].…”

Section: Fukushima‐derived Radioactive Cesium In Near Coastal Area Ofmentioning

confidence: 99%

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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“…The combined inputs of fallout and direct discharges would amount to about 15-18 PBq (Aoyama et al, 2015;Inomata et al, 2016;Tsubono et al, 2016), which represent an increase by 22-27% of the existing 137 Cs in the North Pacific due to global fallout (Aoyama et al, 2015;Buesseler et al, 2017).…”

Section: State Of Knowledge On the Impact Of The Fdnpp Accident On Thmentioning

confidence: 99%

Marine radioecology after the Fukushima Dai-ichi nuclear accident: Are we better positioned to understand the impact of radionuclides in marine ecosystems?

Batlle

Aoyama

Bradshaw

et al. 2018

Science of The Total Environment

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This paper focuses on how a community of researchers under the COMET (CO-ordination and iMplementation of a pan European projecT for radioecology) project has improved the capacity of marine radioecology to understand at the process level the behaviour of radionuclides in the marine environment, uptake by organisms and the resulting doses after the Fukushima Dai-ichi nuclear accident occurred in 2011. We present new radioecological understanding of the processes involved, such as the interaction of waterborne radionuclides with suspended particles and sediments or the biological uptake and turnover of radionuclides, which have been better quantified and mathematically described.We demonstrate that biokinetic models can better represent radionuclide transfer to biota in nonequilibrium situations, bringing more realism to predictions, especially when combining physical, chemical and biological interactions that occur in such an open and dynamic environment as the ocean. As a result, we are readier now than we were before the FDNPP accident in terms of having models that can be applied to dynamic situations.The paper concludes with our vision for marine radioecology as a fundamental research discipline and we present a strategy for our discipline at the European and international levels. The lessons learned 2 are presented along with their possible applicability to assess/reduce the environmental consequences of future accidents to the marine environment and guidance for future research, as well as to assure sustainability of marine radioecology in Europe and globally. This guidance necessarily reflects on why and where further research funding is needed, signalling the way for future investigations.3

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“…T 1/2 represents the halving time of the surface 137 Cs abundance. The inset map shows the polygons used to calculate the abundance discharged directly into the ocean from the FDNPP has been estimated to be 3.6 ± 0.7 × 10 15 Bq (Tsumune et al 2013;Aoyama et al 2016). Therefore, at least 1.3% of the directly discharged 137 Cs was deposited in the area shallower than 800 m depth.…”

Section: Abundance Of 137 Cs In Surface Sedimentsmentioning

confidence: 99%

“…The calculated inventory for September 2011 accounted for about 6.4% of the direct release (3.6 × 10 15 Bq; Tsumune et al 2013;Aoyama et al 2016). Another pathway by which 137 Cs can reach the monitoring area is atmospheric input.…”

Section: Overall 137 Cs Inventory In the Monitoring Areamentioning

confidence: 99%