Numerical experiment for strontium-90 and cesium-137 in the Japan Sea

Kawamura, Hideyuki ; Ito, Toshimichi ; Kobayashi, Takuya ; Otosaka, Shigeyoshi ; Hirose, Naoki*; Togawa, Orihiko

A numerical experiment is performed to reproduce a distribution of concentrations of $^{90}$ Sr and $^{137}$ Cs and estimate their total amounts in the Japan Sea. The concentrations of $^{90}$ Sr and $^{137}$ Cs in the surface layer is in the range of 1.0-1.5 Bq/m $^{3}$ and 2.0-2.5 Bq/m $^{3}$ . The concentrations in the intermediate and deep layer are higher than those observed in the northwestern Pacific Ocean, indicating active winter convection in the Japan Sea. The total amounts of $^{90}$ Sr and $^{137}$ Cs in the seawater is evaluated to be 1.34 PBq (1 PBq = 10 $^{15}$ Bq) and 2.02 PBq, which demonstrates an estimation by observational data in the Japan Sea expeditions between 1997 and 2002 by Japan Atomic Energy Agency. The total amounts of $^{90}$ Sr and $^{137}$ Cs vary corresponding to deposition at the sea surface with the maximums of 4.86 PBq for $^{90}$ Sr and 7.33 PBq for $^{137}$ Cs in the mid-1960s.

Language	:	English
Journal	:	Journal of Oceanography
Volume	:	66
Number	:	5
Pages	:	p.649 - 662
Publication Year/Month	:	2010/10
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Paper URL	:	https://doi.org/10.1007/s10872-010-0053-5
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Cooperating Institute	:	九州大学

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Registration No. : AA20090897
JAEA Abstracts No. : 39000354
Paper Submission No. : 8588

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