西安市及周边地区MODIS气溶胶光学厚度与PM10浓度关系模型研究

西安是空气污染监控和防治有代表性的西部大型城市。研究了西安市及周边地区上空气溶胶光学厚度与PM10浓度的关系模型。利用2011—2012年MODIS卫星气溶胶光学厚度（AOD）遥感产品，通过数据匹配，利用地面气象观测站点的能见度数据和相对湿度数据对AOD产品进行垂直标高订正和湿度订正，2项订正显著提高了AOD和地面PM10浓度的相关性，相关系数从0．36提高到0．65，按季节分类统计和订正春至冬四季的相关系数分别为0．57、0．71、0．62和0．87，夏季和冬季的订正更为有效，可用性更高，这可能由于受到不同季节气溶胶来源和特征的影响。为研究中国西部大型城市，特别是西安市空气环境监测和区域联防联控提供了一种有效方法。

A study of relationship between MODIS aerosol optical depth and PM10 concentration over Xi＇an

As a typical city in western China, air pollution over the region of Xi＇ an city needs to be moni- tored and controlled. We studied the relationship between aerosol optical depth （AOD） and the surface-level PM10 concentrations over Xi＇ an and the surrounding area. The MODIS AOD data during the period from 2011 to 2012 were matched to the PM10 concentrations in time and space. The ground-based measurements of visibility and relative humidity （RH） were used for the vertical and RH corrections, respectively. Due to these correc- tions, the correlation coefficient between AODs and surface-level PM10 concentrations can be significantly im- proved from 0.36 to 0.65. The correlation coefficients for spring, summer, autumn and winter are 0.57, 0.71, 0.62 and 0. 87, respectively, indicating that the corrections are more effective for summer and winter due to the seasonal differences on the source and properties of aerosols. This study provides an efficient way of monitoring and controlling air pollution for western large cities in China, especially for Xi＇ an city.