Evolution of surface O3 and PM2.5 concentrations and their relationships with meteorological conditi

• 作 者: Zivin Zhang Xiaoling Zhang Daoyi Gong Weijun Quan Xiujuan Zhao Zhiqiang Ma Seong-Joong Kim
• 机 构: State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Bei
• 出 处: 第32届中国气象学会年会
• 发表日期: 2015年12期
• 关键词: PM2.5 O3 Meteorological factors Haze days Beijing

　　In this study, hourly and daily records since 2005 and collation, regression and composite methods were used to analyze the long-term evolution of surface O3 and PM2.5 concentrations at the rural.station of Shangdianzi (SDZ) and urban station of Baolian (BL) over Beijing and their Rlationships with mete orological conditions.The results show that the mean concentrations of PM2.5 (O3) decreased (inceased)at the urban and rual stations over the last decade.The linear trends o f the annul mean concentrations of PM2.5 at BL and 5DZ were-31.8 ug/m3/10yr (4.3%/yr) (p < 0.01) and 13.3 ug/m3/10yr (2.9%/yr)(p < 0.05),respectively.In winter, the mean wind speed (Ws) and relative humidity (RH) were the most closely coredated with O3 at both stations, whereas RH and sunshine hours (S) were most closely correlated with PM2.5 The correlation coefficients and explained variances in spring and autumn were generally less than those in winter and greater than those in summer.Moreover, increase in precipitation can significantly reduce the PM2.5 concentration in both urban and rural areas in Beijing, whereas trace and light precipitation more effectively decreases the O3 concentration.Concentrations of PM2.5 (O3) on haze days increased by 114% (3%) and 162% (20%) compared wit h that on non-haze days at the urban and rural stations.repectively.This result suggests that haze is a major manifestation of air pollution in Beijing.