东海大气中C_(2)~C_(8)非甲烷烃的来源与环境效应  

Sources and environmental effects of C_(2)~C_(8)non-methane hydrocarbons in the atmosphere over the East China Sea

作　　者：柳振飞 吴英璀 乔浩 周立敏[1,2] 张洪海[1,2] LIU Zhen-fei;WU Ying-cui;QIAO Hao;ZHOU Li-min;ZHANG Hong-hai(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Frontiers Science Center for Deep Ocean Multispheres and Earth System,Ocean University of China,Qingdao 266100,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学,深海圈层与地球系统前沿交叉中心,海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [2]中国海洋大学化学化工学院,山东青岛266100

出　　处：《中国环境科学》2023年第7期3281-3289,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(41876082,42276042);自然资源部海洋大气化学与全球变化重点实验室开放基金资助课题(GCMAC2007)。

摘　　要：采用三级低温预浓缩-气相色谱-质谱联用的方法,测定了2021年10月东海大气中16种C_(2)~C_(8)烷烃、烯烃和芳香烃等非甲烷烃(NMHCs)的浓度,探究其空间分布特征与来源,并对其环境效应进行评价.结果表明,大气中NMHCs的浓度范围为1.15~18.05×10^(-9),平均值为(4.98±4.91)×10^(-9),烷烃、烯烃和芳香烃的平均值分别为(2.11±2.02)×10^(-9),(1.18±1.04)×10^(-9)和(1.69±2.51)×10^(-9).东海大气不同NMHCs组分的浓度和空间分布存在较大差异,烷烃和芳香烃在整体上表现出近岸高、远海低的分布特征,但烷烃不同站位间的浓度差异更小,而烯烃则呈现出相对均匀的分布特征,其均受到人类活动的显著影响.正交矩阵因子分解模型(PMF)源解析结果表明,船舶排放对东海大气NMHCs的贡献最高,达到(32±30)%,海洋释放源的贡献占比为(28±23)%.芳香烃是调查海域大气中NMHCs的关键活性组分,其对臭氧(O_(3))和二次有机气溶胶(SOA)生成的贡献显著大于烷烃和烯烃.The concentrations of 16 kinds of C_(2)~C_(8)non-methane hydrocarbons(NMHCs)such as alkanes,alkenes and aromatic hydrocarbons in the atmosphere over the East China Sea during October 2021 were determined with the three-step low-temperature preconcentration system coupled with a gas chromatography-mass detector,which were used to explore their spatial distribution characteristics and sources and further evaluate their environmental effects.The atmospheric mixing ratios of the total NMHCs ranged from 1.15×10^(-9)to 18.05×10^(-9)with an average of(4.98±4.91)×10^(-9),and the average values of alkanes,alkenes and aromatic hydrocarbons were(2.11±2.02)×10^(-9),(1.18±1.04)×10^(-9)and(1.69±2.51)×10^(-9),respectively.The concentrations and spatial distributions of different NMHCs components were quite different.The concentrations of alkanes and aromatic hydrocarbons were higher near the shore and lower away from the shore,but the concentration differences between different stations of alkanes were smaller,while the alkenes showed relatively uniform distribution characteristics,though they were strongly affected by human activities.Source apportionments by positive matrix factorization(PMF)model showed that the ship emissions were the highest contributor for atmospheric NMHCs,which accounted for(32±30)%,and the contribution of marine emission sources was(28±23)%.Aromatic hydrocarbons were the key active components of the atmospheric NMHCs over the East China Sea,and their contributions to the generation of ozone(O_(3))and secondary organic aerosol(SOA)were significantly greater than those of alkanes and alkenes.

关 键 词：非甲烷烃 空间分布 来源 环境效应 东海 

分 类 号：X511[环境科学与工程—环境工程]