长江口及邻近海域大气中C_(2)-C_(5)非甲烷烃来源与环境效应研究  

Research on Sources and Environmental Effects of C_(2)-C_(5) Non-methane Hydrocarbons in the Atmosphere over the Yangtze River Estuary and Its Adjacent Areas

作　　者：李思潼 王健[1] 吴英璀 周立敏[1] 张洪海[1,2] Li Sitong;Wang Jian;Wu Yingcui;Zhou Limin;Zhang Honghai(College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;Laboratory for Maine Ecology and Environmental Science, Pilot National Laboratory of Marine Science and Technology(Qingdao), Qingdao 266237, China)

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [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,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2021年第10期71-79,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41876082);国家重点研究发展计划项目(2016YFA0601300);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青年人才培育项目(LMEES-YTSP-2018-02-08)资助。

摘　　要：非甲烷烃(Non-methane hydrocarbons,NMHCs)是大气中重要的痕量活性气体,在参与大气化学反应以及全球碳循环过程中扮演着重要的角色。于2019年3月对长江口及邻近海域上层大气NMHCs进行采样分析,探究其浓度空间分布与来源,并评估其大气反应活性及环境效应。调查海域大气中乙烷、丙烷、正丁烷、异丁烷、乙烯、1-丁烯、异丁烯和异戊二烯的浓度分别为(0.43±0.18)、(0.24±0.17)、(0.14±0.12)、(0.06±0.07)、(10.0±4.70)、(0.32±0.31)、(0.15±0.28)和(0.06±0.10)ppbv。丙烷和异丁烷(R2=0.940,n=25)、异丁烯和异戊二烯(R^(2)=0.972,n=25)的相关性显著,表明丙烷和异丁烷、异丁烯和异戊二烯的来源和去除过程相似。调查海域大气中不同NMHCs之间的浓度以及空间分布差异较大。因受陆源输入影响,长江口海域烷烃类NMHCs的浓度明显高于邻近海域;烯烃类NMHCs因光化学寿命较短,其浓度分布受陆源输入影响较小。大气反应活性以及环境效应结果显示,烯烃类NMHCs是调查组分中的关键活性组分,且对臭氧(O_(3))和二次有机气溶胶(Secondary organic aerosol,SOA)生成的贡献要明显大于烷烃类。Non-methane hydrocarbons(NMHCs),one of the most important trace active gases in the atmosphere,play significant roles in atmospheric chemical reactions and global carbon cycle.Samples of NMHCs in the upper atmosphere of the Yangtze River Estuary and its adjacent waters were collected in March 2019,which were used to explore their spatial distribution and sources and to evaluate their atmospheric reactivity and environmental effects.The atmosphere concentrations of ethane,propane,n-butane,isobutane,ethene,1-butene,isobutene and isoprene were(0.43±0.18),(0.24±0.17),(0.14±0.12),(0.06±0.07),(10.0±4.70),(0.32±0.31),(0.15±0.28)and(0.06±0.10)ppbv,respectively.Significant correlations between propane and isoprene(R2=0.940)and between isobutene and isoprene(R^(2)=0.972)were observed,respectively,suggesting their similar sources and removal processes.The concentration and spatial distribution of different NMHCs in the atmosphere of the research area vary widely.Due to the influence of terrestrial input,the concentrations of alkanes NMHCs in the Changjiang Estuary were significantly higher than those in the adjacent sea area.The concentration of alkenes NMHCs,however,were less affected by terrestrial input owing to their short life span.The results of atmospheric reaction activity and environmental effects showed that alkenes NMHCs were the key active components,and the contribution of alkenes to the formation of ozone(O_(3))and secondary organic aerosol(SOA)was significantly greater than that of alkanes.

关 键 词：非甲烷烃 异戊二烯 分布 环境效应 长江口 

分 类 号：X131.1[环境科学与工程—环境科学]