摘要
气溶胶类型在反演光学厚度时非常重要,采用待反演地区最合理的气溶胶类型可以极大地提高反演精度。结合中分辨率成像光谱仪(MODIS)的数据,提出一种确定气溶胶各组分体积百分比的数学模型,利用这种数学模型得到自定义的杭州地区气溶胶类型,结合改进的暗像元法并基于6S大气辐射传输模式可以反演得到气溶胶光学厚度。将反演结果与AERONET太阳光度计的气溶胶观测值进行对比,结果显示反演的相对误差绝对值在20%以内。采用6S大气辐射传输模式给出的标准气溶胶类型对杭州地区大气进行光学厚度反演,将反演结果和采用自定义气溶胶类型时的反演结果分别与太阳光度计的观测值进行对比,结果表明采用自定义的气溶胶类型时反演值的相对误差绝对值比采用标准气溶胶类型时反演值的相对误差绝对值要低3%以上。
Because the aerosol type is very important in the inversion of optical thickness, it can greatly improve the inversion precision by using the most accurate aerosol type of the inversion area. Combined with the moderate resolution imaging spectroradiometer（MODIS） data, a mathematic model for solving the aerosol concentration ratio in Hangzhou area is proposed. By using the aerosol types of this mathematical model, the aerosol optical thickness can be obtained based on the 6S atmospheric model combined with the improved dense dark vegetation. The aerosol observation results are compared with aerosol values detected by AERONET sun photometer, which show that the inversion error absolute value is within 20%. The Hangzhou area atmospheric aerosol optical standard type 6S atmospheric model is given and the thicknesses of the inversion are compared with the inversion values using custom aerosol. The results show that the absolute value of retrieval relative errors of optical thicknesses by using aerosol types of custom value is 3% lower than that by using standard aerosol type value.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第1期1-9,共9页
Acta Optica Sinica
基金
国家自然科学基金(61375011)
浙江省自然科学基金(LY13F030015)
关键词
大气光学
气溶胶
光学厚度
暗像元法
太阳光度计
atmospheric optics
aerosol
optical thickness
dense dark vegetation algorithm
sun photometer
