綦倩倩,何真,杨桂朋,汪浩

• 1:中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室
• 2:青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室

摘要(Abstract)：

测定了2018年春季长江口及其邻近海域海水和大气中碘甲烷(Iodomethane, CH_3I)、二溴甲烷(Dibromomethane, CH_2Br_2)和溴仿(Tribromomethane, CHBr_3)的浓度,研究其在海水和大气中的浓度分布特征,探讨了环境因素对其源汇和浓度分布的影响。调查海域海水中CH_3I、CH_2Br_2和CHBr_3的浓度分别为(5.76±2.50)、(5.38±3.31)和(4.65±3.50) pmol·L~(-1),总体呈现出近岸高,远岸低的趋势。调查海域CH_3I的浓度分布受浮游植物的影响显著;CH_2Br_2的分布是多种因素共同作用的结果,其中人为输入是影响CH_2Br_2浓度分布的重要因素之一;CHBr_3的浓度分布受人为输入和浮游植物产生释放的共同影响。垂直方向上,海水上下混合比较均匀,受长江冲淡水和沉积物释放的影响,CH_3I、CH_2Br_2和CHBr_3在表层和底层都观测到浓度高值。大气中CH_3I、CH_2Br_2和CHBr_3浓度分别是(1.06±0.77)、(1.72±1.22)和(1.97±2.12) pptv,总体上呈现近岸高于远岸的趋势,人为排放、海-气交换和气团活动共同影响了大气中挥发性卤代烃(Volatile halocarbons, VHCs)的浓度分布,大气中的CH_2Br_2和CHBr_3存在多种来源,不同来源之间CH_2Br_2和CHBr_3排放比率存在较大差异。CH_3I、CH_2Br_2和CHBr_3的海-气通量分别为(50.21±45.47)、(-1.76±77.43)和(-37.65±87.07) nmol·(m~2·d)~(-1),表明调查期间长江口及其邻近海域是CH_3I的源,同时也是CHBr_3和CH_2Br_2的汇。

关键词(KeyWords)： 挥发性卤代烃;长江口;分布;来源;海-气通量

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41830534,41506088);; 国家重点研究发展计划项目(2016YFA0601304);; 中央高校基本科研业务费项目(201762030)资助~~

作者(Author): 綦倩倩,何真,杨桂朋,汪浩

DOI: 10.16441/j.cnki.hdxb.20200211

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