中文摘要：

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C2Cl4和3种CFCs浓度.海水中CH3I、CH3Br、CHBr3和C2Cl4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.CH3I与CH3Br和CHBr3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C2Cl4、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CH3I、CH3Br、CHBr3和C2Cl4的源.

英文摘要：

The concentrations of four kinds of VHCs including CH3I,CH3Br,CHBr3and C2Cl4in the East China Sea were measured during the period of19October2015to2November2015.Furthermore,C2Cl4and three kinds of CFCs concentrations in the marine atmosphere were determined.The concentrations of CH3I,CH3Br,CHBr3and C2Cl4in the coastal waters were higher than those in the open sea.In the PN section the vertical distribution of VHCs had a common feature that the maxima appeared in the upper mixed layer.The distributions of the four kinds of VHCs were significantly influenced by the Yangtze River runoff,the Kuroshio water,biological production and anthropogenic activities.A positive correlation was found between the CH3I and chlorophyll-a(Chl-a)concentrations in the surface seawater,indicating that phytoplankton biomass might play an important role in the distribution of CH3I.Besides,a marked positive correlation among the CH3I,CH3Br and CHBr3concentrations were observed,suggesting that they might have some common sources and removal pathways.The atmospheric concentrations of the three kinds of CFCs were lower than the global averages,showed that the emissions of CFCs in China were progressively reduced.According to the analysis results of backward trajectories,the offshore terrigenous pollutant diffusion and transport were the main source of C2Cl4,CFC-11,CFC-113and CFC-114in the East China Sea atmosphere.The sea-to-air flux data indicated that the entire East China Sea shelf acted as a source for atmospheric CH3I,CH3Br,CHBr3and C2Cl4during the study period.