MODIS气溶胶光学厚度产品和激光雷达数据在大气颗粒物监测中的应用

遥感反演是区域尺度上近地面颗粒物数据获取的有效手段。利用激光雷达观测的消光系数垂直分布、地面相对湿度、风速等数据,对无锡市MODIS(中分辨率成像光谱仪)气溶胶光学厚度(AOD)产品进行垂直、湿度和风速订正,并用研究区域中7个地面站点的PM_(10)和PM_(2.5)浓度监测数据对订正结果进行评估。结果表明:经过订正的MODIS AOD产品与地面监测数据具有良好的相关性,其中与PM_(10)的决定系数达到0.452,与PM_(2.5)的决定系数达到0.449,说明MODIS AOD产品经相关订正后,可用于无锡及其附近地区地面空气污染的监测。在MODIS AOD产品的垂直订正方面,利用激光雷达数据的订正效果好于利用能见度数据的订正效果。在遥感与实测数据的相关性季节变化方面,夏季相关性最高,秋季次高,春季较低,冬季最低。

Application of Atmospheric Particles Monitoring based on MODIS Aerosol Optical Thickness Products and Laser Radar

Remote sensing is an effective approach to monitoring near\|surface atmospheric particulate matter.In this paper,the vertical,humidity and wind\|speed correction were conducted for the MODIS (moderate resolution imaging spectrometer) AOD (aerosol optical depth) data over the Wuxi city by the vertical distribution of extinction coefficients obtained from laser radar,surface relative humidity data and wind\|speed data.Validation was performed using PM10 and PM2.5 concentration monitoring data in 7 ground sites over the study area.The results showed that there were good correlations between the corrected MODIS AOD remote sensing products and the ground monitoring data.The coefficients of determination between corrected MODIS AOD and PM10 was 0.452,and between corrected MODIS AOD and PM2.5 was 0.449.These results suggested that corrected MODIS AOD data should be used to monitor air quality over the Wuxi city.The results also showed that the vertical correction results using the laser radar data were better than those using the visibility data.In addition,the correlations between corrected MODIS AOD and ground monitoring data were highest in summer,followed in autumn and spring.The corrections were lowest in winter.