秋季东海挥发性卤代烃的分布和海-气通量研究

发布时间：2018-02-03 19:05

本文关键词： 挥发性卤代烃分布海洋大气海-气通量东海　出处：《中国环境科学》2017年05期 　论文类型：期刊论文

【摘要】：于2015年10月19日~11月02日对东海表层海水和PN断面不同深度海水中4种VHCs浓度进行了测定,并同时测定了调查海域大气中C_2Cl_4和3种CFCs浓度.海水中CH_3I、CH_3Br、CHBr_3和C_2Cl_4浓度水平分布总体呈现近岸高于外海的趋势;PN断面4种VHCs浓度高值出现在表面混合层.海水中4种VHCs分布受到长江冲淡水、黑潮水、生物生产释放以及人为污染等多种因素的影响.相关性分析表明CH3I与Chl-a之间存在显著相关性,推断浮游植物生物量可能影响碘甲烷浓度分布.CH_3I与CH_3Br和CHBr_3之间也有一定的相关性,推测3种VHCs存在相似的来源或去除机制.东海大气中3种CFCs大气浓度值低于全球平均值,表明我国CFCs的排放逐步降低.后向轨迹分析表明来自近岸陆源污染物的扩散和输送是东海大气中C_2Cl_4、CFC-11、CFC-113和CFC-114的重要来源.海水中4种VHCs海-气通量的估算结果表明秋季东海是大气中CH_3I、CH_3Br、CHBr_3和C_2Cl_4的源.
[Abstract]:From October 19th 2015 to November 2nd, the concentrations of four kinds of VHCs in the surface seawater of the East China Sea and the different depths of the PN section were determined. At the same time, the concentrations of C _ 2Cl _ 4 and three kinds of CFCs in the air of the investigated sea area were determined. The concentration distribution of CHBr_3 and C2Cl4 in general showed a trend of inshore higher than that of offshore; Four kinds of VHCs concentration in PN section appear in the surface mixed layer, and four kinds of VHCs distribution in seawater are affected by the Yangtze River diluted water and the Kuroshio water. The correlation analysis showed that there was a significant correlation between CH3I and Chl-a. It is inferred that phytoplankton biomass may affect the concentration distribution of CH3I. CH3I also has a certain correlation with CH_3Br and CHBr_3. It is inferred that the three VHCs have similar sources or removal mechanisms. The atmospheric concentrations of three CFCs in the East China Sea are lower than the global average. The results show that the emission of CFCs in China is gradually decreasing, and the backward trajectory analysis shows that the diffusion and transport of pollutants from land-based sources in the East China Sea is C2ClSIV CFC-11 in the atmosphere of the East China Sea. The estimation results of four VHCs sea-air fluxes in seawater indicate that the East China Sea is the Ch _ 3I _ I _ 3 Ch _ S _ 3BR in the atmosphere in autumn. Source of CHBr_3 and C2Cl4.
【作者单位】：中国海洋大学化学化工学院;海洋国家实验室海洋生态与环境科学功能实验室;
【基金】：国家自然科学基金(41320104008,41506088) 山东省博士后创新基金(82214237) 中央高校青年教师专项基金(841513026) 山东省“泰山学者”建设工程
【分类号】：P732.6;X51
【正文快照】： 挥发性卤代烃(VHCs)是一类重要的大气痕量气体,而海洋是大气中卤素(Br和I)的一个巨大储库.Lovelock[1]首先报告了海水中含有CH3X(Br和I),使其在海洋环境中的来源与迁移途径受到了更广泛的关注.CH3X在大气中不仅直接与O3反应产生卤氧自由基(XO),直接造成大气中臭氧的破坏,并且

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