Chemical characteristics and source apportionment of atmospheric precipitation in Yongxing Island
XIAO Hong-wei1,2, XIAO Hua-yun1,2, ZHANG Zhong-yi3, WANG Yan-li4, LONG Ai-min5, LIU Cong-qiang3
1. Laboratory of Atmospheric Environment, Key Laboratory of Nuclear Resources and Environment, Ministry of Education, East China University of Technology, Nanchang 330013, China;
2. School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China;
3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
4. Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
5. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Concentrations of major ions concentration were analyzed in rainwater collected at Yongxing Island of Xisha, South China Sea during 2013. The positive matrix factorization (PMF) and backward trajectories of air mass were used to identify the sources of major ions. The results showed that the orders of volume-weighted average concentrations of anions and cations were: Cl-, SO42-, NO3- and Na+, Ca2+, Mg2+, NH4+, K+, respectively. The Na+ and Cl- were the major anion and cation, respectively, indicating that they were derived from sea water. The SO42-, Mg2+, and K+ were also mainly from sea water; while part of SO42- might come from the combustion of fossil fuel and K+ from biomass burning. The Ca2+ was mainly from soil, while NO3- mainly from combustion of fossil fuel. Furthermore, this study found that NH4+ had more complex sources, such as the emissions of human activities, organic matter degradation in marine environment, and etc. According to the Redfield ratio of carbon to nitrogen, the contribution of NO3- and NH4+ in rainwater to new production in South China Sea was about 4.8% to 13.5%. Back trajectories indicated that the sources of ions in rainwater at Yongxing Island derived from many regions, such as the northeast China and south China, and Malaysia, or South China Sea itself.
肖红伟, 肖化云, 张忠义, 王燕丽, 龙爱民, 刘丛强. 西沙永兴岛大气降水化学特征及来源分析[J]. 中国环境科学, 2016, 36(11): 3237-3244.
XIAO Hong-wei, XIAO Hua-yun, ZHANG Zhong-yi, WANG Yan-li, LONG Ai-min, LIU Cong-qiang. Chemical characteristics and source apportionment of atmospheric precipitation in Yongxing Island. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(11): 3237-3244.
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