贵阳市AOD与PM_(2.5)间的相关性分析

Analysis on the Correlation between Aerosol Optical Depth and PM_(2.5) in Guiyang City

本文基于高时空分辨率的环境一号卫星CCD影像数据,在采用6S辐射传输模型构建查找表的基础上,利用改进的暗像元法实现了贵阳市气溶胶光学厚度(Aerosol Optical Depth,AOD)的反演,并对AOD的时空变化特征进行了分析;采用皮尔逊相关系数分析揭示了贵阳市AOD与地面实测PM_(2.5)浓度间的相关性。试验结果表明,贵阳市AOD空间上呈现出南高北低的变化趋势;AOD和PM_(2.5)浓度均表现为逐年下降的变化趋势;4个选定时段的AOD与PM_(2.5)浓度间均具有较强的相关性,且相关系数无明显差异,从而证明了基于HJ-1卫星AOD进行贵阳市区域PM_(2.5)浓度高精度估计的可行性。

On the basis of the establishment of the look-up table through 6S radiation transmission model,the Aerosol Optical Depth(AOD)in Guiyang City was inversed by the improved dark dense vegetation(DDV)method with the HJ-1 satellite CCD data which has high spatial and temporal resolution,and analyzed the spatio-temporal distribution and variation characteristics of AOD;Then,the correlation between the AOD in Guiyang City and PM_(2.5) measured on the ground is analyzed and revealed by Pearson correlation coefficient.The results show that,the spatial distribution of AOD in Guiyang are high in the south and low in the north;both AOD and PM_(2.5) concentrations show a decreasing trend year by year;there is a strong correlation between AOD and PM_(2.5) concentration in the four selected time periods,and there is no significant difference in correlation coefficient,this proves the feasibility of high-precision estimation of PM_(2.5) concentration in Guiyang region based on HJ-1 satellite AOD.