A correlation analysis of MODIS 3 km aerosol optical depth and PM10 concentration in Northern Xinjiang
A correlation analysis of MODIS 3 km Aerosol Optical Depth (AOD) and PM10 concentration has been performed over Northern Xinjiang Uygur Autonomous Region with the MODIS products,PM10 concentration datasets,and related meteorological data in 2016.The results indicate that there is a low direct correlation between AOD and PM10 concentration with the correlation coefficient of 0.294.Therefore,two methods are utilized to correct the AOD and PM10 concentration,and a comparison between them has been accomplished.One is AOD vertical correction with visibility at first,and then a further correction is made with humidity (named as " AOD vertical-humidity correction").The other is AOD vertical correction with visibility and PM10 concentration correction with humidity (" AOD vertical-PM10 humidity correction").It is revealed that the correlation between AOD and PM10 concentration has been greatly improved with the correlation coefficient of 0.755,after AOD vertical correction with visibility data and PM10 concentration correction with humidity over Northern Xinjiang.Among all the stations,the largest correction coefficient of 0.837 appears at Aletai station.Finally,an optimal fitting model has been established by using the vertical corrected AOD and humidity corrected PM10 concentration.Based on the model,PM10 concentration is retrieved in Northern Xinjiang with the MODIS 3 km Aerosol Optical Depth (AOD) as inputs.The retrieved PM1o concentration has a positive correlation with the humidity corrected PM10 concentration with the correlation coefficient up to 0.688.The two largest correlation coefficient are 0.910 and 0.829 occurs at Changji and Yining stations,respectively.This study proposes that MODIS 3 km AOD products with vertical and humidity corrections are effective to monitor PM10 concentration in Northem Xinjiang.
NETL
NSTL
万方数据
