西沙永兴岛大气降水化学特征及来源分析

发布时间：2018-05-31 18:22

本文选题：南海 + 降水　；参考：《中国环境科学》2016年11期

【摘要】：于2013年对南海西沙永兴岛雨水进行采集,分析了其主要阴阳离子,利用PMF模型对不同离子组成的来源进行解析并运用Traj Stat软件模拟后向气团轨迹污染物来源区域的分析.结果表明,永兴岛降水离子浓度顺序为:Cl~-、SO_4~(2-)、NO_3~-和Na~+、Ca~(2+)、Mg~(2+)、NH_4~+、K~+.Na~+和Cl~-是降水中主要的阴阳离子,表现出海洋性降水的特征.SO_4~(2-)、Mg~(2+)、K~+主要来源于海水,但SO_4~(2-)也受化石燃料燃烧等影响,而K~+可能受生物质燃烧的影响.Ca~(2+)主要来源于土壤,少数来源于其他影响.NO_3~-主要来源于化石燃料燃烧释放,而NH_4~+有多种来源,包括内陆人为活动的排放和海洋本身有机物降解过程释放的影响.根据Redfield比,可以初步计算出降水中NO-3~-和NH_4~+对南海新生产力的贡献约为4.8%~13.5%.后向气团轨迹表明,永兴岛降水的离子来源区域相对复杂,包括我国东北地区、南方区域,以及马来西亚等国家、地区的影响,或者来源于南海局地的影响.
[Abstract]:In 2013, the rainwater of Yongxing Island, Xisha, Xisha, South China Sea was collected, and the main Yin and yang ions were analyzed. The sources of different ions were analyzed by PMF model and the source region of the air mass trajectory was simulated by Traj Stat software. The results showed that the order of precipitation ion concentration in Yongxing island was Cl~-, SO_4~ (2-), NO_3~- and Na~+, Ca~ (2+), Mg~ (2+), NH_4~+, K~+.Na~+ and Cl~- are the main Yin and yang ions in precipitation, showing the characteristics of marine precipitation,.SO_4~ (2-), Mg~ (2+), and K~+ mainly originate in the sea water, but they are also affected by the combustion of fossil fuels. It is mainly derived from the release of fossil fuel combustion, while NH_4~+ has a variety of sources, including the emission of inland human activities and the release of the degradation process of the marine organic matter. According to the Redfield ratio, the contribution of NO-3~- and NH_4~+ to the new productivity of the South China Sea in the precipitation can be estimated to be about 4.8%~13.5%. back air mass trajectory. The ion source regions of water are relatively complex, including the influence of the northeast region, the southern region, and the Malaysia and other countries, or the effects of the South China Sea.
【作者单位】：东华理工大学核资源与环境教育部重点实验室大气环境实验室;东华理工大学水资源与环境工程学院;中国科学院地球化学研究所环境地球化学国家重点实验室;中国环境科学研究院;中国科学院南海海洋研究所热带海洋环境国家重点实验室;
【基金】：国家自然科学基金资助项目(41663003,41203015,41425014) 东华理工大学校科技创新团队科研启动基金项目(DHKT2015101);东华理工大学博士科研启动基金项目(DHBK2015327)
【分类号】：X51;P426.612

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