Ou Sheng-Ju, Wei Wei, Wang Xiao-Qi, Yao Sen, Zhou Zhi-Bo, Guan Pan-Bo, Duan Wen-Jiao, Yao Shi-Yin
Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China.
Huan Jing Ke Xue. 2020 Jul 8;41(7):3085-3094. doi: 10.13227/j.hjkx.201912114.
The pollution characteristics of surface ozone and its response to meteorological factors and precursors were studied based on monitoring and Model-3/CMAQ modeling from May to August 2018 in Handan City, China. The monitoring results showed that the maximum daily 8-hour average ozone concentration (MDA8 O) ranged from 38.0-238.0 μg·m, and the nonattainment for ozone reached 44.7% during the studied period, indicating the more severe photochemical pollution in summer in Handan City. The ozone concentration was positively correlated with temperature (=0.74 on nonattainment days and 0.42 on attainment days), but negatively correlated with relative humidity (=-0.63 on nonattainment days and -0.58 on attainment days), demonstrating the role of photochemistry in the surface ozone of Handan City. Moreover, the highest ozone level occurred at wind speeds higher than 2.25 m·s or lower than 1.00 m·s during ozone nonattainment days, which indicated that regional transport and local accumulation can both cause serious ozone pollution in the city. Regarding the response of ozone to its precursors (VOCs and NO), model simulation results based on the brute force method showed the stronger positive sensitivity to VOCs, but a weak negative sensitivity to NO. Therefore, reduction of anthropogenic VOCs emissions is the key to improving ozone pollution in Handan City. We used the propylene-equivalent method to identify the importance of alkene and aromatic species for ozone pollution during ozone nonattainment days.
基于2018年5月至8月在中国邯郸市的监测以及Model-3/CMAQ模型模拟，研究了地表臭氧的污染特征及其对气象因素和前体物的响应。监测结果表明，日最大8小时平均臭氧浓度（MDA8 O）范围为38.0 - 238.0 μg·m，在研究期间臭氧超标率达到44.7%，表明邯郸市夏季光化学污染较为严重。臭氧浓度与温度呈正相关（超标日为0.74，达标日为0.42），但与相对湿度呈负相关（超标日为 - 0.63，达标日为 - 0.58），这表明光化学作用对邯郸市地表臭氧有影响。此外，在臭氧超标日，风速高于2.25 m·s或低于1.00 m·s时臭氧水平最高，这表明区域传输和本地累积都可能导致该市严重的臭氧污染。关于臭氧对其前体物（挥发性有机物和氮氧化物）的响应，基于强力法的模型模拟结果表明，臭氧对挥发性有机物的正敏感性更强，但对氮氧化物的负敏感性较弱。因此，减少人为挥发性有机物排放是改善邯郸市臭氧污染的关键。我们使用丙烯当量法确定了臭氧超标日烯烃和芳烃物种对臭氧污染的重要性。
