延吉市PM2.5时空分布特征及其与气象要素的相关性分析

利用延吉市城区3个空气质量监测站2015年PM_2.5浓度小时数据,探讨了延吉市城区PM_2.5时空分布特征,并将PM_2.5浓度与气象要素做相关性分析.研究结果表明: ①延吉市PM_2.5季节浓度由高到低依次为冬季、秋季、春季和夏季.②延吉市PM_2.5月均浓度变化均呈单峰单谷型,其中11月、12月、1月浓度值相对较高,2月开始逐月递减至10月份后开始回升.③PM_2.5日均浓度曲线呈现出尖峰和深谷交替变化的锯齿状.④延吉市城区3个监测点PM_2.5浓度日变化在春季、夏季、秋季和冬季都呈现双峰双谷型.⑤PM_2.5浓度与气压、气温日较差、风速、相对湿度等气象要素之间存在显著地相关性.

Spatio-temporal distribution of PM_(2.5) in Yanji City and its relationship with meteorological conditions

Based on the PM_2.5 concentration hour data of three air quality monitoring stations in Yanji City, the spatial and temporal distribution characteristics of PM_2.5 in Yanji City were discussed, and the correlation between PM_2.5 concentration and meteorological elements was analyzed, the results showed that: i)PM_2.5 seasonal concentration of Yanji City from high to low were winter, spring, autumn, summer; ii)The PM_2.5 monthly average concentration of Yanji City displays single peak and single valley, the highest monthly average concentration appears were November, December and January, Declining from February; iii)For the whole year, daily variation of PM_2.5 showed a jaggies curve; iv)Diurnal average concentrations of PM_2.5 showed an obviously bimodal curve in spring, summer, autumn and winter, autumn and spring; v)There was a significant correlation between PM_2.5 concentration and meteorological elements.