利用MODIS遥感数据反演广州市气溶胶光学厚度

利用中分辨率成像光谱仪(MODIS)数据和NASA的V5.2气溶胶业务反演算法,对广州市进行了高空间分辨率气溶胶光学厚度的反演,并应用地面太阳光度计(CE-318)观测的气溶胶光学厚度进行验证.结果表明,利用MODIS L1B数据进行高分辨率气溶胶光学厚度反演,结果精度较高.利用反演结果分析2008~2009年冬季广州市的气溶胶光学厚度时空变化特征,2008年12月的气溶胶光学厚度较低,平均大约为0.65,随后气溶胶光学厚度逐渐增大,到2009年2月,气溶胶光学厚度平均大约为1.35.广州市气溶胶光学厚度空间差异显著,在0.1~1之间变化,呈东北低西南高的空间分布特征.即森林覆盖率比较高的地区气溶胶较低.

The retrieval of aerosol optical thickness with high spatial resolution using MODIS data over Guangzhou

The aerosol optical thickness(AOT)with high-resolution over Guangzhou was retrieved asmg the MODIS L1B data and the aerosol retrieval algorithm (V5.2) developed by NASA.The retrieval AOTs were validated by the ground-based measured AOTs derived from sun photometer(CE-318).This exercise indicated that it was reasonable to USe MODIS L1B data for retrieval of high resolution AOT in regional scale.The AOT characteristics of spatial and temporal variation over Guangzhou were analyzed based on the retrieval results during winter of 2008～2009.The mean AOT was about 0.65 in December 2008,and then was increasing with temporal evolution,and the mean value was about 1.35 in February 2009.The value of AOT presented different spatial distribution pattern over Guangzhou,the higher value appeared in northeast region,the lower appeared in southwest and it was associated closely with forest area.