| Gu Hequan,Zhao Feng,Yu Wei,Li Ruihuan,Zhao Li,Li Dongmei. 2019. Distributions of 224, 223Ra and 137Cs in the Luzon Strait and its adjacent waters and their response to Typhoon Rainbow. Acta Oceanologica Sinica, 38(12):1－7 |
| Distributions of 224, 223Ra and 137Cs in the Luzon Strait and its adjacent waters and their response to Typhoon Rainbow |
| 224,223Ra和137Cs在吕宋海峡及周边海域的分布以及其对“彩虹”台风的响应 |
| Received:May 08, 2019 |
| DOI：10.1007/s13131-019-1508-1 |
| Key words:224Ra 223Ra Luzon Strait typhoon 137Cs |
| 中文关键词: 224Ra 223Ra 吕宋海峡 台风 137Cs |
| 基金项目:The Natural Science Foundation of Guangdong Province of China under contract No. 2017A030310592; the Open Project of State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences under contract No. LTO1709; the Key Program of Bureau Director of State Oceanic Administration, P.R. China under contract No.180104. |
| Author Name | Affiliation | E-mail | | Gu Hequan | South China Sea Environment Monitoring Center, State Oceanic Administration, Guangzhou 510300, China | guhequan1983@163.com | | Zhao Feng | South China Sea Environment Monitoring Center, State Oceanic Administration, Guangzhou 510300, China | | | Yu Wei | South China Sea Environment Monitoring Center, State Oceanic Administration, Guangzhou 510300, China | | | Li Ruihuan | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | Zhao Li | South China Sea Environment Monitoring Center, State Oceanic Administration, Guangzhou 510300, China | | | Li Dongmei | South China Sea Environment Monitoring Center, State Oceanic Administration, Guangzhou 510300, China | |
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| Abstract: |
| This paper reports the distribution of natural radionuclides of 224, 223Ra in the surface water and stratified waters of the Luzon Strait and its adjacent waters during the cruises of September 2015 and May 2016. To understand the impact of the Fukushima nuclear accident, the artificial radionuclide 137Cs in the waters was also analyzed. The results showed that the activities of 224, 223Ra and 137Cs were all within the natural radioactive background levels of the marine environment in the South China Sea. 224Ra had a higher activity level in the water of the north South China Sea to the west of the Luzon Strait, and a lower activity level in the oceanic Philippine Sea to the east. The 137Cs activity had no obvious spatial trends. Based on the vertical trends of 224Ra, 137Cs, and water temperature and salinity at three stations (LS3, LS5 and LS8), the distinct characteristics of the activity levels and gradients of 224Ra and 137Cs among the tropical surface water, subsurface water and mid-deep water were revealed. Typhoon Rainbow event reversed the overall circulation of the Luzon Strait and its adjacent area. A huge amount of western Pacific water characterized by low 224Ra activities flooded into the South China Sea, reducing the activity level of 224Ra in the waters. However, there were no significant differences of 137Cs activity between the West Pacific and the north South China Sea, and ocean current changes had no effect on the 137Cs activity levels of the water bodies. |
| 中文摘要: |
| 本文报道2015年9月和2016年5月期间天然放射性核素224Ra和223Ra在吕宋海峡及周边海域表层和垂向水体的分布特征。为理解日本福岛核事故的影响，本文亦分析研究区域内人工放射性核素137Cs的分布特征。结果表明，224，223Ra和137Cs比活度水平均处于我国南海海洋天然放射性本底变化范围之内。224Ra在吕宋海峡以西南海北部海域比活度较高，在吕宋海峡以东菲律宾海域比活度较低。137Cs没有明显的分布趋势。基于三站位（LS3，LS5和LS8）224Ra、137Cs以及温盐的垂向分布特征，本文揭示224Ra和137Cs在热带表层水、次表层水和中-深层水中比活度水平和梯度变化的差异特征。彩虹台风事件扭转了整个吕宋海峡及周边海域的海流循环过程。大量以低水平224Ra为特征的西太平洋海水涌入南海，降低水体224Ra比活度水平。但是，西太平洋和南海北部海域水体137Cs比活度水平没有明显差异，台风导致的海流变化对水体137Cs比活度没有明显影响。 |
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