Fukushima-derived radiocesium in the western subarctic area of the North Pacific Ocean, Bering Sea, and Arctic Ocean in 2019 and 2020
Fukushima-derived radiocesium in the western subarctic area of the North Pacific Ocean, Bering Sea, and Arctic Ocean in 2019 and 2020
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DOI：
10.1016/j.jenvrad.2022.106949
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发表时间：
2022-10-01
影响因子：
2.3
通讯作者：
Sato, Kazutoshi
中科院分区：
文献类型：
--
作者：
Kumamoto, Yuichiro;Aoyama, Michio;Sato, Kazutoshi
我们测量了2019年和2020年在北太平洋、白令海和北冰洋西部亚北极地区收集的表层海水中溶解的放射性铯（Cs-134和Cs-137）。2011年福岛第一核电站事故（FNPP 1）释放的放射性铯仍在这些地区观测到（经衰变校正至事故发生之日，相当于2 Bq m（-3））。在2019/2020年，白令海和楚科奇海（连接白令海和北冰洋的北冰洋边缘海）的FNPP 1衍生放射性铯浓度在2017/2018年观测到的范围内。另一方面，2019/2020年首次在楚科奇海以北的北冰洋发现了FNPP 1衍生的放射性铯。这可能是由于在过去的十年中，FNPP 1衍生的放射性铯从日本北太平洋沿海地区通过白令海向北冰洋的远距离传输。2019/2020年FNPP 1衍生放射性铯从白令海向西亚北极地区的输送尚不清楚，这意味着FNPP 1衍生放射性铯在白令海内的保留。
We measured dissolved radiocesium (Cs-134 and Cs-137) in surface seawater collected in the western subarctic area of the North Pacific Ocean, Bering Sea, and Arctic Ocean in 2019 and 2020. The radiocesium released from the accident of the Fukushima Dai-ichi nuclear power plant (FNPP1) in 2011 was still observed in these areas (similar to 2 Bq m(-3) decay-corrected to the date of the accident). In 2019/2020, the FNPP1-derived radiocesium concentrations in the Bering Sea and the Chukchi Sea, which is a marginal sea of the Arctic Ocean connecting the Bering Sea to the Arctic Ocean, were within the range of those observed in 2017/2018. On the other hand, the FNPP1-derived radiocesium was detected in the Arctic Ocean farther north of the Chukchi Sea in 2019/2020 for the first time. This was probably derived from the long-range transport of the FNPP1-derived radiocesium from the North Pacific coastal area of Japan to the Arctic Ocean through the Bering Sea during the past decade. The transport of the FNPP1-derived radiocesium from the Bering Sea to the western subarctic area in 2019/2020 is not clear, which implies the retainment of the FNPP1-derived radiocesium within the Bering Sea.