福岛核事故泄漏入海137Cs在西北太平洋向西南输运的数值研究

日本福岛核事故泄漏以及通过大气沉降到海洋中的铯137（137Cs）总量高达15~50 PBq，酿成了迄今为止最严重的一次由核事故引发的海洋污染。近期研究及观测证实，泄漏入海的137Cs在海洋上层主要向东运移，同时还存在海洋表层和次表层向西南方向运移的分支。然而由于海洋放射性物质模式的匮乏，导致137Cs对中国海的影响及范围不明确。本申请基于已建立的准全球海洋放射性物质模式，拟结合分析观测数据，通过以下两个方面研究137Cs在中国海的传输路径、影响范围及滞留时间：（1）建立北太平洋高分辨率海洋放射性物质模式；（2）模拟福岛核事故泄漏入海的137Cs向西南运移路径、范围及滞留时间。研究结果将宜于评估137Cs对中国海的影响。

Nuclear accident at the Fukushima Dai-ichi was the most recent tragedy in the nuclear society. The total release of radioactive 137Cs could reach 15-50 PBq. Previous studies and measurements showed that 137Cs was transported to southwest ocean through surface and subsurface ocean. The impact of transported 137Cs on China seas remains uncertain for lack of high-resolution ocean radionuclides model. This proposal focuses on the transport path and residence time of 137Cs in China seas, in combination with a quasi-global ocean radionuclides model and filed observation data, which includes the following two parts: (1) set up a high-resolution ocean radionuclides model; (2) simulate the 137Cs southwest transport channel and the effects on China seas.