Spread of Fukushima‐derived radiocesium over the coastal ocean in response to typhoon‐induced flooding in September 2011

Spread of Fukushima‐derived radiocesium over the coastal ocean in response to typhoon‐induced flooding in September 2011
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2011 年 9 月台风引发的洪水导致福岛放射性铯在沿海海洋扩散

DOI:
10.1002/lno.12065
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发表时间:
2022
影响因子:
4.5
通讯作者:
Yoshinari Hiroshi
Yoshinari Hiroshi
中科院分区:
地球科学1区
文献类型:
--
作者:
Tanaka Kiyoshi;Nagao Seiya;Kitade Yujiro;Niki Masato;Katsumata Takaaki;Miyama Toru;Yoshinari Hiroshi

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2011 年 3 月 11 日,日本太平洋沿岸发生东北地震,引发的海啸对日本福岛第一核电站 (FDNPP) 造成严重破坏。因此,2011年9月7日至12日,即与台风塔拉斯(T1112)相关的河流洪水事件发生后的8天内,进行了一次船上调查,以阐明放射性铯在黑潮-亲潮过渡区(FDNPP以南)沿海海洋上的扩散过程。调查中,在海面成功观测到放射性铯和低盐度水的广泛分布,延伸至海岸线近100公里。此外,在沿海海洋中放射性铯与盐度之间检测到显着的负相关。就在船上调查之前,台风给流入调查区域的利根川和那珂川流域带来了特大降雨,导致利根川和那珂川的流量在峰值时(9月4日)分别达到约2800和700 m3s−1。这些排放量是自 2007 年以来的最高记录。与高放射性和低盐度区域相对应的卫星图像显示,在调查期间,叶绿素水华也蔓延到了广阔的区域。这些结果表明,放射性铯和低盐度水在沿海海洋上的广泛分布是由与台风相关的高水平河流排放造成的。
The Tohoku earthquake off the Pacific coast of Japan on 11 March 2011 and the resulting tsunami led to severe damage to the Fukushima Daiichi Nuclear Power Plant (FDNPP) in Japan. Therefore, a shipboard survey was conducted to elucidate spread processes of radioactive cesium over the coastal ocean in the Kuroshio–Oyashio transition zone (south of the FDNPP) from 07 to 12 September 2011, that is, within 8 d of a river flood event associated with Typhoon Talas (T1112). In the survey, broad distributions of radiocesium and low‐salinity water extending nearly 100 km off the coast were successfully observed at the sea surface. Moreover, a significant negative correlation was detected between radiocesium and salinity in the coastal ocean. Just before the shipboard survey, the typhoon brought extremely heavy rainfall over the catchment areas of the Tone and Naka Rivers flowing into the survey region, resulting in discharges from the Tone and Naka Rivers reaching approximately 2800 and 700 m3s−1, respectively, at their peaks (04 September). These discharges were the highest recorded since 2007. Satellite images corresponding to the high‐radioactivity and low‐salinity areas revealed that chlorophyll blooms also spread over a broad area during the survey. These results indicate that the broad distributions of radiocesium and low‐salinity water over the coastal ocean were brought about by the high levels of river discharge associated with the typhoon.
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发表时间: 1983
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