沈阳市环境空气中PM_(2.5)与O_(3)关联性分析

Study on the correlation between PM_(2.5)and O_(3)in ambient air in Shenyang

以东北地区典型城市沈阳市为例,运用多种监测手段,分析了沈阳市环境空气中PM_(2.5)和O_(3)的浓度及其组分的关联性,以期为PM_(2.5)与O_(3)的协同控制提供技术支撑。结果表明:春季和秋季O_(3)最大8 h滑动平均值浓度随PM_(2.5)日均浓度的升高而呈现先升高后降低的趋势;夏季两者浓度在0.01水平上呈显著正相关;冬季两者浓度在0.01水平上呈显著负相关关系。春季和秋季昼间PM_(2.5)浓度越高,O_(3)小时浓度上升速率越快,夜间PM_(2.5)浓度越高,O_(3)小时浓度下降速率越快。夏季昼间、夜间O_(3)小时浓度均随PM_(2.5)浓度的升高而升高。冬季昼间、夜间O_(3)小时浓度均随PM_(2.5)浓度的升高而降低。随光化学活性水平的增强,PM_(2.5)和O_(3)的相关性逐渐减弱。中度光化学活性水平下,白天PM_(2.5)/CO的值明显高于其他光化学活性水平,但中度、重度光化学水平下,白天PM_(2.5)/CO的变化速率明显大于低、轻度光化学水平。且PM_(2.5)/CO的峰值与O_(3)峰值具有高度一致性。夏、秋2季SNA(SO 2-4、NO-3、NH+4)在PM_(2.5)中所占比例与O x在0.01水平上呈显著正相关。春、夏、秋季SOA在PM_(2.5)中所占比例与O x在0.01水平上呈显著正相关。

Taking Shenyang,a typical city in Northeast China,as an example,this study analyzes the correlation between the concentrations and components of PM_(2.5)and O_(3)in the ambient air of Shenyang by using various monitoring methods,in order to provide technical support for the collaborative control of PM_(2.5)and O_(3).The results show that the maximum 8-hour sliding average concentration of O_(3)in spring and autumn increases first and then decreases with the increase of PM_(2.5)average daily concentration.In summer,the concentrations of both were positively correlated at 0.01 level.In winter,there was a significant negative correlation between the two concentrations at 0.01 level.The higher the PM_(2.5)concentration in spring and autumn,the faster the O_(3)hourly concentration increases;The higher the PM_(2.5)concentration at night,the faster the O_(3)hourly concentration decreases.In summer,the hourly O_(3)concentration increases with the increase of PM_(2.5)concentration.In winter,the hourly O_(3)concentration decreased with the increase of PM_(2.5)concentration.With the increase of photochemical activity level,the correlation between PM_(2.5)and O_(3)gradually decreases.The change rate of PM_(2.5)/CO at moderate and severe photochemical activity levels was significantly higher than that at low and mild photochemical activity levels.The peak value of PM_(2.5)/CO is highly consistent with that of O_(3).The proportion of SNA(SO 2-4,NO-3,NH+4)in PM_(2.5)in summer and autumn was significantly positively correlated with O x at 0.01 level.The proportion of SOA in PM_(2.5)in spring,summer and autumn was significantly positively correlated with O x at 0.01 level.