Study on the environmental behavior of air pollutants by using airborne radioactivity as a tracer

以空气放射性示踪剂研究空气污染物的环境行为

基本信息

批准号：
16310039
负责人：
IIDA Takao
金额：
$ 8.77万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The study on the regional diffusion of atmospheric pollutants from East Asia region to Northwest Pacific Ocean and the dispersion over a wide area associated with nuclear accident is an important and urgent environmental problem in East Asia. Radon is a good tracer for atmospheric pollutants. A network of atmospheric radon monitoring stations was constructed at Beijing and Qingdao in China, at Seoul, Donghae and Jeju in Korea, at Oki and Hekura islands on the Sea of Japan at Matsue, Kanazawa, Nagoya and Hamaoka in Japan and at Hateruma, Hachijo and Ogasawara islands on the Pacific Ocean. The atmospheric radon concentration decreases gradually from China to Japan and on the Pacific Ocean. Continuous data of radon concentrations were obtained at Seoul, Hamaoka and Hachijojima island from July 2005 to October 2006. The radon concentrations at Hamaoka were affected by maritime air mass during July to October and continental air mass during the end of December to February.The long-range transport model was developed and evaluated by using atmospheric radon concentrations observed in East Asia region. The calculated radon concentrations were compared with the values observed at Hachijo and Hateruma islands, Nagoya and Beijing during January and December 2004. The calculated radon concentrations were underestimate at all measuring locations. The reasons were expected to be (1) over estimate of vertical diffusion coefficient, (2) inflow of radon out of computational domain, (3) Interpolation of vertical wind speed and (4) evaluation of radon flux. After considering these factors, the calculated concentrations were substantially improved.

关于大气污染物从东亚地区到西北太平洋的区域扩散以及与核事故相关的广泛区域的分散的研究是东亚的重要且紧急的环境问题。 ra是大气污染物的好示踪剂。在中国的北京和Qingdao，韩国的首尔，东海和济州的北京和青岛，在日本海洋的北京和韩国的Hekura群岛上建立了一个大气ra监测站的网络，位于日本的Matsue，Kanazazawa，Kanazazawa，Nagoya，Nagoya和Hamaoka的日本以及Hateruma，Hateruma，Hathateruma，Hachijo和Ogasawara和Ogasawara Isserss的Matsue海洋。大气ra浓度从中国到日本和太平洋逐渐下降。从2005年7月到2006年10月，在首尔，哈莫卡和哈希乔吉马岛获得了ra浓度的连续数据。在7月至10月，在7月至10月的大陆空气质量和12月底的大陆空气质量的影响。将计算出的ra浓度与2004年1月和12月在Hachijo和Hateruma Islands，Nagoya和Beijing上观察到的值进行了比较。在所有测量位置，计算出的ra浓度都低估了。预计的原因将是（1）垂直扩散系数的估计值，（2）ra插入计算域中的流入，（3）垂直风速的插值和（4）ra剂量的评估。考虑到这些因素后，计算出的浓度得到了显着提高。