研究报告
卢学强,韩萌,冉靓,韩素芹,赵春生.天津中心城区夏季非甲烷有机化合物组成特征及其臭氧产生潜力分析[J].环境科学学报,2011,31(2):373-380
天津中心城区夏季非甲烷有机化合物组成特征及其臭氧产生潜力分析
- Characteristics of nonmethane organic compounds and their ozone formation potentials in downtown Tianjin in summer
- 基金项目：环保部国家公益性行业科研专项项目(No.200909022);天津市科委基础与应用基础研究项目(No.10JCYBJC05800)
- 作者
- 单位
- 卢学强
- 天津市环境保护科学研究院, 天津 300191
- 韩萌
- 天津市环境保护科学研究院, 天津 300191
- 冉靓
- 北京大学物理学院大气科学系, 北京 100871
- 韩素芹
- 天津市气象科学研究所, 天津 300074
- 赵春生
- 北京大学物理学院大气科学系, 北京 100871
- 摘要：大气中非甲烷有机化合物(NMOCs)作为臭氧产生前体物之一,其浓度与组成特征研究对于研究地面臭氧形成的机制有重要的科学意义.选择夏季时段从2009年8月6日到13日在天津中心城区气象局铁塔站位对NMOCs进行采样分析,采样频次为每日5次,采样时间从7:30am到23:00pm间隔2～3h采样1次.天津城区NMOCs的含碳数浓度的日均值为342ppbC,主要由烷烃和芳香烃组成.根据OH自由基活性加权方法和MIR方法的评估,芳香烃对臭氧光化学产生的贡献占主导性地位,烯烃虽然浓度水平不高,但对臭氧的贡献仅次于芳香烃.丁烯、二甲苯和三甲苯是此次监测中臭氧产生潜力最大的几个物种.与上海城区比较,采样期内天津城区NMOCs的浓度及其变化范围均高于上海城区.
- Abstract：Because of the importance of nonmethane organic compounds (NMOC) as one of precursors of tropospheric ozone,measuring the composition and ozone formation potentials of various NMOCs species will help us better understand the urban ozone formation mechanism. NMOCs sampling was conducted at an interval of 2～3 hours from 7:30 am～23:00 pm (five times per day) from 6 to 13 August,2010 at the Tianjin Meteorology Bureau Tower in downtown Tianjin. The mean concentration of daily NMOCs is 342 ppbCand the major components are alkanes and aromatics. According to assessment using both a OH-reactivity-based method (propene-equivalent concentration) and maximum incremental reactivity,aromatics play a dominant role in contributing to photochemical ozone production. Despite having the lowest mixing ratio,alkenes are next to aromatics in their contribution to ozone formation. Butene,xylene and trimethylbenzene are among the top compounds in terms of their ozone formation potentials. Compared to urban Shanghai,both the mean concentration and concentration range of NMOCs in downtown Tianjin were much greater within the sampling period.
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