摘要
文章通过对广州番禺大气成分站(GPACS)2010-2016年的历史观测数据进行分析,结果表明,2013年广州地区光化学高臭氧事件发生次数最多,且均发生在夏秋季。2013年日O_3最大均值和日均值在10月最大,分别为103.02×10~(-9)和53.81×10~(-9)。NO和NO_2浓度在7月最大,日均浓度分别为5.90×10~(-9)和16.03×10~(-9),7月NO对O_3化学滴定最明显。夏秋季O_3峰值出现时间较晚,在18:00左右。O_3浓度随着NO_2/NO比值升高而升高。选取夏季NO、NO_2、O_3与NO_x进行非线性拟合,发现当NO_x浓度<19.35×10~(-9)或者>87.71×10~(-9)时,O_3为光化学氧化剂O_x的主体;当NO_x浓度>19.35×10~(-9)而<87.71×10~(-9)时,NO_2为光化学氧化剂O_x的主体。秋季大量的气溶胶污染对辐射进行衰减,导致O_3生成在较低辐射范围内主要处于太阳辐射控制区。夏秋季的风速整体较小,有利于污染物的积累。
An analysis was made by using historical observational data(2010-2016)of Guangzhou Panyu Atmospheric Composition Station(GPACS).The results showed that high ozone(O_3) episodes occurred most frequently in 2013 in Guangzhou area,and happened both in summer and autumn.O_3 maximum average concentration and daily concentration were the highest in October in 2013 with 103.02×10~(-9) and 53.81×10~(-9) respectively,while NO and NO_2 daily concentration were the highest in July with 5.90×10~(-9) and 16.03×10~(-9) respectively.NO had the most obvious chemical titration effect on O_3 in July.The peak O_3appeared late,at about 18:00 in summer and autumn.O_3 concentration went up with the increase of the ratio of NO_2/NO.NO,NO_2,O_3 and NO_xwere selected for non-linear fitting in summer,it was found that when NO_x concentration was less than19.35×10~(-9) or greater than 87.71×10~(-9),O_3 had larger contribution to the photochemical oxidant(O_x),while NO_xconcentration was greater than 19.35×10~(-9) and less than 87.71×10~(-9),NO_2 was the main body of O_x.In autumn,a large amount of aerosol pollution attenuated radiation,which gave rise to the situation that the O_3 formation in relatively low radiation was mainly in photo-limited regime in autumn.The wind speed was relatively low in summer and autumn,which was conductive to the accumulation of pollutants.
引文
[1] Chan C K, Yao X H. Air pollution in mega cities in China[J]. Atmospheric Environment, 2008,42(1):1-42.
[2] Wang T J, Jiang F, Deng J J, et al. Urban air quality and regional haze weather forecast for Yangtze River Delta region[J]. Atmospheric Environment, 2012,58:70-83.
[3] Zhao P H, Zhang X L, Xu X F, et al. Long-term visibility trends and characteristics in the region of Beijing, Tianjin and Hebei, China[J]. Atmospheric Research, 2011, 101(3):711-718.
[4] Zou Y, Deng X J, Zhu D, et al. Characteristics of 1 year of observational data of VOCs, NOxand O3at a suburban site in Guangzhou, China[J]. Atmospheric Chemistry Physics,2015,15(12):6625–6636.
[5] Wang T, Wei X L, Ding A J, et al. Increasing surface ozone concentrations in the background atmosphere of southern China, 1994-2007[J]. Atmospheric Chemistry and Physics,2009,9:6217-6227.
[6] Ran L, Zhao C S, Xu W Y, et al. VOC reactivity and its effect on ozone production during the HaChi summer campaign[J]. Atmospheric Chemistry Physics, 2011, 11:4657-4667.
[7]陆玉霞,邵平,安俊琳.南京北郊夏季大气光化学污染特征研究[J].环境科学与技术, 2015,38(3):102-107.Lu Yuxia, Shao Ping, An Junlin, et al. Characteristics of atmospheric photochemical pollution during summer in Nanjing northern suburb[J]. Environmental Science&Technology, 2015,38(3):102-107.
[8] Sillman S. The use of NOy, H2O2, and HNO3as indicators for ozone-NOx-hydrocarbon sensitivity in urban locations[J].Journal of Geophysical Research, 1995, 100(14):175-184,188.
[9] Tie X, Madronich S, Li G H, et al. Characterizations of chemical oxidants in Mexico City:a regional chemical/dynamical model(WRF-Chem)study[J]. Atmospheric Environment, 2007,41:1989-2008.
[10] Geng F H, Tie X X, Xu J M, et al. Characterizations of ozone, NOx, and VOCs measured in Shanghai, China[J]. Atmospheric Environment, 2008,42:6873-6883.
[11] Guo H, Ling Z H, Cheng H R, et al. Tropospheric volatile organic compounds in China[J]. Science of the Total Environment, 2017,574:1021-1043.
[12] Gao W, Tie X X, Xu J M, et al. Long-term trend of O3in a mega city(Shanghai), China:characteristics, causes, and interactions with precursors[J]. Science of the Total Environment, 2017,604:425-433.
[13] Li Y, Lau K H, Funf C H, et al. Importance of NOxcontrol for peak ozone reduction in the Pearl River Delta region[J].Journal of Geophysical Research, 2013,118:1-16.
[14] Tie X X, Madronich S, Stacy W, et al. Assessment of the global impact of aerosols on tropospheric oxidants[J]. Journal of Geophysical Research, 2005,141(1):1-9.
[15]邓雪娇,周秀骥,吴兑,等.珠江三角洲大气气溶胶对地面臭氧变化的影响[J].中国科学, 2011,41(1):93-102.Deng Xuejiao, Zhou Xiuji, Wu Dui, et al. Effect of atmospheric aerosol on surface ozone variation over the Pearl River Delta region[J]. Science China Press, 2011,41(1):93-102.
[16]邹宇,王凤,邓雪娇,等.广州地区一次典型光化学污染过程监测[J].环境化学, 2018,37(2):353-362.Zou Yu, Wang Feng, Deng Xuejiao, et al. Monitoring of a typical photochemical pollution process in Guangzhou region[J]. Environmental Chemistry, 2018,37(2):353-362.
[17]邓雪娇,王新明,赵春生,等.珠江三角洲典型过程VOCs的平均浓度与化学反应活性[J].中国环境科学, 2010,30(9):1153-1161.Deng Xuejiao, Wang Xinming, Zhao Chunsheng, et al. The mean concentration and chemical reactivity of VOCs of typical processes over Pearl River Delta[J]. China Environmental Science, 2010,30(9):1153-1161.
[18]邹宇,邓雪娇,李菲,等.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.Zou Yu, Deng Xuejiao, Li Fei, et al. Effect of VOCs on O3and SOA formation potential during the combined pollution process in Guangzhou Panyu Atmospheric Composition Station[J]. Environmental Science, 2017,38(6):2246-2255.
[19]邹宇,邓雪娇,李菲,等.广州大气中异戊二烯浓度变化特征、化学活性和来源分析[J].环境科学学报, 2015,35(3):647-655.Zou Yu, Deng Xuejiao, Li Fei, et al. Variation characteristics, chemical reactivity and sources of isoprene in the atmosphere of Guangzhou[J]. Acta Scientiae Circumstantiae,2015,35(3):647-655.
[20] Dunlea E J, Herndon S C, Nelson D D, et al. Evaluation of nitrogen dioxide chemiluminescence monitors in a polluted urban environment[J]. Atmospheric Chemistry Physics,2007,7(10):2691-2704.
[21] Ran L, Zhao C S, Geng F H, et al. Ozone photochemical production in urban Shanghai, China:analysis based on ground level observations[J]. Journal of Geophysical Research,2009:114.
[22] Shen Z X, Cao J J, Zhang L M, et al. Characteristics of surface O3over Qinghai Lake area in Northeast Tibetan Plateau,China[J]. Science of the Total Environment, 2014,500/501:295-301.
[23]吴鄂飞.夏季环境空气中臭氧和氮氧化物变化关系[J].环境科学与技术, 2006,29(S1):56-58.Wu Efei. The transformational relationship between ozone and nitrogen oxide in ambient air over summer[J]. Environmental Science&Technology, 2006,29(S1):56-58.
