基于MODIS气溶胶产品的南昌市PM10质量浓度反演研究

Retrieval of PM10 concentration in Nanchang from MODIS aerosol optical depth

该文使用2017年MODIS MYD04_3K气溶胶光学厚度日产品数据、南昌市环境监测站点实测的PM10质量浓度数据建立AOD与PM10的相关性,并利用水平能见度数据以及相对湿度数据对AOD进行订正,进一步提高两者的相关性以反演南昌市PM10质量浓度.得出结论:①当AOD与PM10质量浓度直接相关时,相关系数较低,仅为0.552.在对AOD进行垂直—湿度订正后,其与PM10质量浓度的相关系数提高到0.714.②利用订正后AOD与PM10质量浓度的最优拟合模型反演PM10质量浓度,发现其与站点实测的PM10质量浓度的相关系数为0.774,反演效果较好.表明MODIS MYD04_3K气溶胶产品在经过垂直—湿度订正后,可以作为南昌市PM10质量浓度监测的一个有效手段.

In this paper,the correlation between AOD and PM10 was established by using the 2017 MODIS MYD04_3K aerosol optical thickness daily product data and the PM10 mass concentration data measured by nanchang environmental monitoring site,and the horizontal visibility data and relative humidity data were used to correct AOD and further improve the correlation between the two to invert the PM10 mass concentration in nanchang.The key findins are as follows:①When the AOD is directly related to the PM10 concentration,the correlation coefficient is low with only 0.572.After the vertical-humidity correction of the AOD,the correlation coefficient of MODIS AOD with the PM10 concentration is increased to 0.7160.②The correlation coefficient between AOD and PM10 mass concentration measured at the site is 0.774,which is a good inversion effect.Therefore,the MODIS MYD04_3K aerosol product has the potential to be used as an effective data for monitoring the PM10 concentration in Nanchang after the vertical-humidity correction.