利用云和气溶胶粒子的光学特性软件包(OPAC)对陆地型、海洋型、沙漠型和极地型四种典型类型气溶胶的吸收光学厚度进行了计算统计分析, 根据每一种类型气溶胶成分的差异, 分析了气溶胶吸收光学厚度随波长及相对湿度变化的规律, 建立了四种典型类型气溶胶吸收光学厚度与波长、相对湿度的定标关系。气溶胶吸收光学厚度随波长的幂指数衰减规律并不是在所有波长范围内均满足, 不同类型的气溶胶, 其适用的范围不同；气溶胶吸收光学厚度随波长和相对湿度的变化主要受气溶胶成分影响, 相对湿度的增大会导致气溶胶吸收特性的降低, 并会对吸收Angstrom指数造成影响。根据建立的气溶胶吸收光学厚度的定标关系, 可由气溶胶激光雷达等设备实测的某一波长的光学参量计算光电系统对应波长、不同相对湿度情况下的光学特性。

With the power-law wavelength dependence of aerosol absorption optical depth (AAOD), aerosol absorption properties of typical types were studied. The effect of relative humidity on aerosol absorption properties and absorption Angstrom exponent were also analyzed upon different aerosol types containing different compositions. The results show that the power-law wavelength dependence of AAOD is not satisfied at all available wavelength, different aerosol types have differently suitable wavelength range. Relative humidity affects AAOD, this is mainly due to aerosol compositions are influenced by relative humidity. Increasing of relative humidity will lead to a decrease in aerosol absorption. Relative humidity can also affect AAE. The universal law of AAOD of typical types varying with relative humidity and wavelength is obtained.