中国7个典型城市城区和郊区ρ(O_(3))的差异分析

Analysis of urban and suburban ρ(O_(3)) in seven typical cities of China

基于2015-2019年沈阳、北京、兰州、南京、武汉、贵阳和广州7个城市的ρ(O_(3))逐小时数据,研究了中国典型城市城区和郊区ρ(O_(3))的差异.结果表明,2015-2019年7个城市的年均ρ(O_(3))由高到低为南京>北京>兰州>沈阳>贵阳>武汉>广州.各城市城区和郊区的ρ(O_(3))普遍表现为郊区大于城区,且存在明显的季节变化、月变化和日变化特征.沈阳、北京、南京和武汉郊区的ρ(O_(3))为夏季最大;贵阳郊区为春季最大;广州郊区为秋季最大;兰州郊区为春季最大,城区为夏季最大;各城市郊区的ρ(O_(3))均为冬季最低.ρ(O_(3))的月变化随着纬度的增加“单峰型”特征越明显.除武汉市的ρ(O_(3))日变化特征为“双峰型”外,其余城市均为明显的“单峰型”.各城市城区和郊区ρ(O_(3))的差异春、冬季大,夏、秋季小,冬季差异最显著.除沈阳城区和郊区ρ(O_(3))差异为夜间最小外,其余城市均为夜间最大.

Based on hourlyρ(O_(3))data of Shenyang,Beijing,Lanzhou,Nanjing,Wuhan,Guiyang and Guangzhou from 2015 to 2019,the differences ofρ(O_(3))between urban and suburban areas of seven typical cities in China were studied.The results showed that the annual averageρ(O_(3))from 2015 to 2019 was ranked as follows:Nanjing>Beijing>Lanzhou>Shenyang>Guiyang>Wuhan>Guangzhou.Each city generally showed that theρ(O_(3))of the suburbs was larger than that of the urban area,and there were obvious seasonal,monthly and daily changes.In terms of seasonal changes,ρ(O_(3))in the urban and suburban areas of Shenyang,Beijing,Nanjing,and Wuhan was the highest in summer,Guiyang in spring,Guangzhou in autumn,and Lanzhou in summer and spring respectively.Theρ(O_(3))in the urban and suburban areas of all cities were the lowest in winter.The monthly variation characteristics of ozone concentration were affected by latitude,and the higher the latitude,the more obvious the single peak.The diurnal variation in the suburbs of Wuhan was characterized by"double peak",while the other cities by"single peak".The difference ofρ(O_(3))between urban and suburban areas was larger in spring and winter but smaller in summer and autumn,and the most significant difference was in winter.Theρ(O_(3))difference between the urban and suburban areas of Shenyang was the smallest at night,and in the other cities it was the largest at night.