北京市MODIS气溶胶光学厚度和PM2.5浓度的时空差异及其相关性研究

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。

Spatial and Temporal Characteristics and relationship of aerosol optical thickness and PM2.5 Concentration over Beijing

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 results 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 concentration of contrast); Daily average spatial distribution Descending to the outer suburbs around the city; Correlation between 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 distribution of PM2.5, compensate for the lack of ground monitoring stations.