Estimate of Fukushima-derived radiocaesium in the North Pacific Ocean in summer 2012
Estimate of Fukushima-derived radiocaesium in the North Pacific Ocean in summer 2012
复制标题
DOI：
10.1007/s10967-018-6249-7
复制
发表时间：
2018-11
影响因子：
1.6
通讯作者：
Y. Inomata;M. Aoyama;T. Tsubono;D. Tsumune;Y. Kumamoto;H. Nagai;T. Yamagata;M. Kajino;Y. Tanaka;T. Sekiyama;E. Oka;M. Yamada
中科院分区：
文献类型：
--
作者：
Y. Inomata;M. Aoyama;T. Tsubono;D. Tsumune;Y. Kumamoto;H. Nagai;T. Yamagata;M. Kajino;Y. Tanaka;T. Sekiyama;E. Oka;M. Yamada
研究了2012年夏季北太平洋东京电力公司福岛第一核电站事故中放射性铯(134Cs和137Cs)的分布。我们利用最优内插分析估算了表层的放射性铯储量，并利用FNPP1-134Cs的垂直剖面和质量平衡分析作为第一种方法估算了向中心模式水(CMW)中的俯冲量。2012年8月至12月北太平洋表层134Cs的库存在2012年10月1日估计为5.1 ± 0.9PBq，相当于经衰变校正至2011年3月11日福岛第一核电站事故发生之日的8.6Pbq± 1.5Pbq。结果表明，2012年释放到北太平洋的134Cs中，有56 ± 10%在表层向东输送，估计为15.3 ± 2.6Pbq。根据表层、副热带模式水和CMW三个区域之间的质量平衡，估算出CMW中134Cs的消减量为2.5 ± 0.9Pbq。
Distributions of radiocaesium (134Cs and137Cs) derived from the Tokyo Electric Power Company (TEPCO) Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident in the North Pacific Ocean in the summer of 2012 were investigated. We have estimated the radiocaesium inventory in the surface layer using the optimal interpolation analysis and the subducted amount into the central mode water (CMW) by using vertical profiles of FNPP1-134Cs and mass balance analysis as the first approach. The inventory of the134Cs in the surface layer in the North Pacific Ocean in August–December 2012 was estimated at 5.1 ± 0.9 PBq on 1 October 2012, which corresponds to 8.6 ± 1.5 PBq when it was decay corrected to the date of the FNPP1 accident, 11 March 2011. It was revealed that 56 ± 10% of the released134Cs into the North Pacific Ocean, which was estimated at 15.3 ± 2.6 PBq, transported eastward in the surface layer in 2012. The amount of134Cs subducted in the CMW was estimated to be 2.5 ± 0.9 PBq based on the mass balance among the three domains of the surface layer, subtropical mode water, and CMW.