Temporal variation of 134Cs and 137Cs activities in surface water at stations along the coastline near the Fukushima Dai-ichi Nuclear Power Plant accident site, Japan
Temporal variation of 134Cs and 137Cs activities in surface water at stations along the coastline near the Fukushima Dai-ichi Nuclear Power Plant accident site, Japan
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DOI：
10.2343/geochemj.2.0211
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发表时间：
2012-01-01
影响因子：
0.8
通讯作者：
Hamajima, Yasunori
中科院分区：
文献类型：
--
作者：
Aoyama, Michio;Tsumune, Daisuke;Hamajima, Yasunori
我们介绍了 2011 年 4 月至 12 月对波崎地表水中 Cs-134 和 Cs-137 活动的观测结果，波崎是位于福岛第一核电站 (FNPP1) 事故现场以南 180 公里的沿海站。我们还通过使用其他几个沿海站点（包括事故现场）的已发布数据来调查趋势。 2011 年 6 月在 Hasaki 观察到放射性铯活动的最大值，这比 FNPP1 2011 年 4 月的相应最大值延迟了两个月。至少在 2011 年 5 月和 6 月，直接排放的 Cs-134 和 Cs-137 主要沿着本州东北部海岸线向南输送。波崎推迟两个月的原因尚不清楚，但 2011 年 5 月中旬，与位于小名滨和波崎之间的岩城附近北纬 36.5 度、东经 141.4 度的温水涡流相关的顺时针洋流可能会阻止向南输送。 2011 年 5 月底之前，将 FNPP1 释放的 Cs-134 和 Cs-137 运输到哈崎。
We present our April to December 2011 observations of Cs-134 and Cs-137 activities in surface water at Hasaki, a coastal station 180 km south of the Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident site. We also investigate trends by using published data from several other coastal stations, including the accident site. The maximum in radiocaesium activity at Hasaki was observed in June 2011, representing a delay of two months from the corresponding maximum in April 2011 at FNPP1. Directly discharged Cs-134 and Cs-137 were transported dominantly southward along the coastline of northeastern Honshu, at least in May and June 2011. The reasons for the two-month delay at Hasaki are not yet clear, but clockwise current associated with a warm water eddy of which center located at 36.5 N, 141.4 E off Iwaki between Onahama and Hasaki in mid of May 2011 might prevent southward transport of Cs-134 and Cs-137 released from FNPP1 to Hasaki until the end of May 2011.