乌鲁木齐市MODIS气溶胶光学厚度与空气质量指数相关性分析

Analysis on Correlation between MODIS Aerosol Optical Depth Values and Air Quality Indices in Urumqi

利用MODIS气溶胶光学厚度(AOD,Aerosol Optical Depth)产品与同期乌鲁木齐市空气质量指数进行相关性分析,得到二者的相关系数为0.664。对MODIS AOD产品进行垂直和湿度订正后,二者的相关性显著提高,相关系数从0.664提高到0.805。订正后按季节分类统计,春、夏、秋3季的相关系数分别为0.775、0.608和0.822,其中秋季的订正更为有效,可用性更高。这可能受到不同季节气溶胶来源、特征以及数据样本差异的影响。最后分别建立全年、春季、夏季和秋季的线性、对数、一元二次、乘幂和指数5种类型的拟合模型。考虑模型易于利用的因素,依据各拟合模型相关系数的大小得到全年以及各季节最优拟合模型,该模型函数可用来反演和监测乌鲁木齐市空气质量指数。

The correlation analysis between the MODIS aerosol optical depth products and the air quality index in Urumqi at the same time was carried out,and the correlation coefficient of the two was 0.664. After correcting the vertical and humidity of MODIS AOD products,the correlation coefficient between the two values increased from 0.664 to 0.805. According to the seasonal classification,the correlation coefficients in spring,summer and autumn were 0.775,0.608 and0.822,respectively,and the correction coefficient in autumn was more effective and available,which may be influenced by aerosol sources,properties,and data sample differences from different seasons. Finally,five types of fitting models were established respectively in whole year,spring,summer and autumn. Considering the factors that the model is easy to use,the best fitting model of the whole year and season was obtained according to the correlation coefficient of each fitting model. The model function can be used to retrieve and monitor the air quality index of Urumqi.