北京市MODIS气溶胶光学厚度和PM_(2.5)浓度的时空差异及其相关性研究

Spatial and Temporal Characteristics and Relationship of Aerosol Optical Thickness and PM_(2.5) Concentration over Beijing

利用NASA MODIS数据反演北京市气溶胶光学厚度,探讨与北京市12个环境污染监测站点PM2.5质量浓度的时空差异及其相关性。结果显示,AOT与PM2.5均有明显的时空分布特征;二者的日均值具有相反的季节性变化特征(AOT夏季日均值高于冬季,PM2.5浓度日均值相反);日均值空间分布围绕城区向远郊区递减;二者的相关性对季节变化敏感,夏季相关性较好,冬季相关性较差。且郊区相关性明显优于城区。因此,卫星气溶胶数据可以反映PM2.5的分布,弥补地面监测站点的不足。

Using NASA MODIS data inversion of the aerosol optical thickness to discuss with the Spatial and Temporal Characteristics and relationship of aerosol optical thickness and PM2. 5 Concentration over Beijing. The re- suits showed that, AOT and PM2. 5 have significant spatial and temporal distribution; The two-day average seasonal variation has the opposite characteristics （AOT daily average summer than in winter, PM2. 5 daily average concentra- tion of contrast） ; Daily average spatial distribution Descending to the outer suburbs around the city; Correlation be- tween both sensitive to seasonal changes, a good correlation between summer and winter poor correlation. And the correlation was significantly better than the city suburbs. Therefore, the satellite aerosol data may reflect the distri- bution of PM2. 5, compensate for the lack of ground monitoring stations