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广州番禺大气成分站复合污染过程VOCs对O3与SOA的生成潜势
引用本文:邹宇,邓雪娇,李菲,殷长秦.广州番禺大气成分站复合污染过程VOCs对O3与SOA的生成潜势[J].环境科学,2017,38(6):2246-2255.
作者姓名:邹宇  邓雪娇  李菲  殷长秦
作者单位:中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室, 广州 510080,中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室, 广州 510080,中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室, 广州 510080,中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室, 广州 510080
基金项目:国家自然科学基金项目(41475105,41405133,41175117,41605105);国家科技支撑计划项目(2014BAC16B06);广东省自然科学基金项目(2014A030313788);科技部公益性行业(气象)科研专项(GYHY201306042);广东省科技计划项目(2015A020215020,2013B030200001);广东省气象局科学技术研究项目(2014Q02)
摘    要:通过对广州番禺大气成分站(GPACS)的历史观测数据进行分析,结果表明在P1(2011-09-02~2011-09-05)和P2(2012-06-12~2012-06-15)期间发生典型灰霾过程并伴有高臭氧(O_3)值事件的发生.在P1和P2复合污染过程中,日能见度变化范围分别为5.78~6.91 km和5.60~9.25 km,最大8 h O_3体积分数分别为92.14×10~(-9)和91.29×10~(-9).在检测到的55种挥发性有机物(VOCs)中,烯烃和芳香烃的活性最高,对等效丙烯浓度和最大O_3体积分数的贡献分别为41%、39%,28%、54%(P1过程)和35%、46%,22%、61%(P2过程).利用气溶胶生成系数(FAC)估算污染过程的二次有机气溶胶(SOA)的生成潜势,发现烷烃、烯烃、芳香烃对SOA的生成潜势分别占13.2%、21.4%、65.4%(P1过程)和4.6%、13.8%、81.6%(P2过程).甲苯、异戊二烯、乙苯、间/对二甲苯是对O_3与SOA生成贡献大的物种.污染物从城区的输送、持续静小风、高温低湿以及强烈辐射共同导致这两次灰霾过程中高臭氧浓度事件的形成.

关 键 词:复合污染过程  臭氧(O3)  二次有机气溶胶(SOA)  生成潜势  广州
收稿时间:2016/5/23 0:00:00
修稿时间:2016/12/24 0:00:00

Effect of VOCs on O3 and SOA Formation Potential During the Combined Pollution Process in Guangzhou Panyu Atmospheric Composition Station
ZOU Yu,DENG Xue-jiao,LI Fei and YIN Chang-qin.Effect of VOCs on O3 and SOA Formation Potential During the Combined Pollution Process in Guangzhou Panyu Atmospheric Composition Station[J].Chinese Journal of Environmental Science,2017,38(6):2246-2255.
Authors:ZOU Yu  DENG Xue-jiao  LI Fei and YIN Chang-qin
Institution:Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China,Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China,Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China and Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China
Abstract:An analysis was made by using historical observational data of Guangzhou Panyu Atmospheric Composition Station(GPACS). The results showed that typical haze processes accompanied with high ozone episodes happened during the period from September 2rd, 2011 to September 5th, 2011(P1) and the period from June 12th, 2012 to June 15th, 2012(P2) respectively. During the two combined pollution processes (P1 and P2), daily visibility ranged from 5.78 km to 6.91 km and from 5.60 km to 9.25 km, and the maximum 8 h O3reached 92.14×10-9 and 91.29×10-9 respectively. Among the 55 detected volatile organic compounds(VOCs), alkenes and aromatics had the highest reactivity with the 41%, 39% proportions of equivalent propylene concentration and the proportions of 28%, 54% in the aspect of ozone formation potential during P1. Alkenes and aromatics contributed 35% and 46% of equivalent propylene concentration, as well as 22% and 61% to ozone formation potential during P2. In terms of SOA formation potential by FAC estimation, alkanes, alkenes and aromatics accounted for 13.2%, 21.4%, 65.4% during P1 and 4.6%, 13.8%, 81.6% during P2 respectively. Toluene, isoprene, ethylbenzene and m,p-Xylene had large contributions to the ozone and SOA formation. Factors including pollutants transported from the downtown area, continuous gentle wind, high temperature, low humidity and strong radiation gave rise to the occurrence of high ozone episodes in these two haze processes.
Keywords:combined pollution process  ozone (O3)  secondary organic aerosol (SOA)  formation potential  Guangzhou
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