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Distribution of Anthropogenic 129I in the Western South China Sea and Its Application for Tracing the Sources and Movement of Pollution
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-08-10 , DOI: 10.1021/acs.est.2c02368 Mengting Zhang 1, 2, 3 , Xiaolin Hou 1, 2, 4, 5 , Luyuan Zhang 1, 4, 5 , Jixin Qiao 2 , Ruiqin Gao 1 , Qi Liu 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-08-10 , DOI: 10.1021/acs.est.2c02368 Mengting Zhang 1, 2, 3 , Xiaolin Hou 1, 2, 4, 5 , Luyuan Zhang 1, 4, 5 , Jixin Qiao 2 , Ruiqin Gao 1 , Qi Liu 1
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Anthropogenic 129I has been dispersed all over the world and could be utilized as an oceanographic tracer based on its conservative nature in the ocean. The first datasets of 129I and 127I were obtained by analysis of seawater of 36 water columns collected in the western South China Sea during August–September 2018. The measured 129I concentrations decreased with depth from (0.93–1.61) × 107 atoms/L in the upper 200 m to (0.04–0.14) × 107 atoms/L at 1500 m, indicating a clear anthropogenic source in the upper layer, mainly originated from the global fallout. The riverine input of the deposited 129I on the catchment area of the Mekong River is an important source besides the direct deposition in the seas. The water mass with high 129I from the Mekong River water moves to the east at 11°N by the North Nansha Current in the surface layer (2–25 m). The exponentially decreasing 129I level with depth indicates that the vertical dispersion of 129I from the upper to the lower layer was mainly through slow diffusion, and the deep water at more than 1500 m was not significantly contaminated by the upper layer water at least in the past 70 years.
中文翻译：
南海西部人为 129I 分布及其在污染源和运动追踪中的应用
人为129 I 已分散在世界各地，基于其在海洋中的保守性质，可用作海洋示踪剂。第一批129 I 和127 I 数据集是通过分析 2018 年 8 月至 9 月在南海西部采集的 36 个水柱的海水获得的。实测129 I 浓度随深度从（0.93-1.61）×10 7个原子而降低上层200 m/L至1500 m(0.04-0.14)×10 7个原子/L，表明上层有明显的人为源，主要来源于全球沉降物。沉积129的河流输入湄公河集水区I是除直接在海中沉积外的重要来源。湄公河水高129 I 的水团在表层（2～25 m）受南沙北流的影响，在 11°N 向东移动。129 I水平随深度呈指数下降表明129 I从上层到下层的垂直扩散主要是通过缓慢扩散，1500 m以上深水至少在1500米以上没有受到上层水的明显污染。过去的 70 年。
更新日期：2022-08-10
中文翻译：
南海西部人为 129I 分布及其在污染源和运动追踪中的应用
人为129 I 已分散在世界各地，基于其在海洋中的保守性质，可用作海洋示踪剂。第一批129 I 和127 I 数据集是通过分析 2018 年 8 月至 9 月在南海西部采集的 36 个水柱的海水获得的。实测129 I 浓度随深度从（0.93-1.61）×10 7个原子而降低上层200 m/L至1500 m(0.04-0.14)×10 7个原子/L，表明上层有明显的人为源，主要来源于全球沉降物。沉积129的河流输入湄公河集水区I是除直接在海中沉积外的重要来源。湄公河水高129 I 的水团在表层（2～25 m）受南沙北流的影响，在 11°N 向东移动。129 I水平随深度呈指数下降表明129 I从上层到下层的垂直扩散主要是通过缓慢扩散，1500 m以上深水至少在1500米以上没有受到上层水的明显污染。过去的 70 年。
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