| 春季长江口及其邻近海域海水和大气中CH3I、CH2Br2和CHBr3的浓度分布与海-气通量 |
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| 引用本文： | 綦倩倩,何真,杨桂朋,汪浩.春季长江口及其邻近海域海水和大气中CH3I、CH2Br2和CHBr3的浓度分布与海-气通量[J].中国海洋大学学报(自然科学版),2021(6):59-69. |
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| 作者姓名： | 綦倩倩 何真 杨桂朋 汪浩 |
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| 作者单位： | 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;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 |
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| 基金项目： | 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。 |
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| 摘 要： | 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,CH3I)、二溴甲烷(Dibromomethane,CH2Br2)和溴仿(Tribromomethane,CHBr3)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CH3I、CH2Br2和CHBr3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CH3I的浓度分布受浮游植物的影响显著;CH2Br2的分布是多种因素共同作用的结果,其中人为输入是影响CH2Br2浓度分布的重要因素之一;CHBr3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,CH3I、CH2Br2和CHBr3在表层和底层都观测到浓度高值。大气中CH3I、CH2Br2和CHBr3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CH2Br2和CHBr3存在多种来源,不同来源之间CH2Br2和CHBr3排放比率存在较大差异。CH3I、CH2Br2和CHBr3的海-气通量分别为(50.21±45.47)、(-1.76±77.43)和(-37.65±87.07)nmol·(m2·d)-1,表明调查期间长江口及其邻近海域是CH3I的源,同时也是CHBr3和CH2Br2的汇。
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| 关 键 词： | 挥发性卤代烃 长江口 分布 来源 海-气通量 |
Distributions and Sea-to-Air Fluxes of CH3I,CH2Br2and CHBr3in the Yangtze River Estuary and Its Adjacent Marine Area in Spring |
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| QI Qian-Qian,HE Zhen,YANG Gui-Peng,WANG Hao.Distributions and Sea-to-Air Fluxes of CH3I,CH2Br2and CHBr3in the Yangtze River Estuary and Its Adjacent Marine Area in Spring[J].Periodical of Ocean University of China,2021(6):59-69. |
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| Authors: | QI Qian-Qian HE Zhen YANG Gui-Peng WANG Hao |
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| Institution: | (College of Chemistry and Chemical Engineering, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;Laboratory for Marine Ecology and Environmental Science, Polit National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China) |
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| Abstract: | Seawater and atmosphere concentrations of the three volatile halocarbons(VHCs),methyl iodide(CH3I),dibromomethane(CH2Br2)and bromoform(CHBr3)were investigated along with main controlling factors in the Yangtze River Estuary and its adjacent marine area during 9 March 2018 to 24 March 2018.Concentrations of CH3I,CH2Br2and CHBr3in the surface seawater were(5.76±2.50),(5.38±3.31)and(4.65±3.50)pmol·L-1.The concentration distributions of the three VHCs generally decreased from inshore to offshore regions except for a few high-value stations of CH2Br2in the open sea.Phytoplankton release was an important source of CH3I,while human input was one of the factors affecting the concentration of CH2Br2.Our results also suggest that distribution of CHBr3was influenced by human activities and phytoplankton release might contribute to CHBr3concentration maxima in the surface water.Vertical distributions showed high concentrations of CH3I,CH2Br2and CHBr3in the surface and bottom layers due to the impact of Changjiang input and sediments release.The mean mixing ratios of CH3I,CH2Br2and CHBr3in the atmosphere were(1.06±0.77),(1.72±1.22)and(1.97±2.12)pptv.Elevated concentrations of the three VHCs in the atmosphere were observed in coastal areas.These results may be related to the influence of anthropogenic release,sea-air exchange and air mass activities.The CH2Br2/CHBr3ratios in the atmosphere indicated that the emission ratios of CHBr3and CH2Br2between different sources were various.The sea-to-air fluxes of CH3I,CH2Br2and CHBr3were(50.21±45.47),(-1.76±77.43)and(-37.65±87.07)nmol·(m2·d)-1,which indicated that the Yangtze River Estuary was the source of CH3I,but the sink of CHBr3and CH2Br2. |
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| Keywords: | volatile halocarbons Yangtze River Estuary distribution sources sea-to-air fluxes |
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