气溶胶组分反演方法光学辐射产品 精度的综合分析

基于 2005–2013 年 POLDER-3 多角度偏振观测资料, 通过最新开发的可以实现气溶胶光学特性及组分信息 同时反演的气溶胶组分卫星反演方法获得全球气溶胶综合产品, 并利用 AERONET (Aerosol Robotic Network) 全球站 点观测资料对反演获得的气溶胶光学辐射特性产品进行了综合评价分析, 讨论了气溶胶组分反演方法的适用性和 先进性。结果表明, 气溶胶组分反演方法应用于多角度偏振观测中, 不仅可以获得高精度的多个波段气溶胶光学厚 度 (AOD) 产品, 还可以获得多个波段吸收性气溶胶光学厚度 (AAOD) 以及不同波段组合下 (440/670 nm, 670/870 nm, 870/1020 nm, 440/1020 nm) Ångstrom ¨ 指数 (AE) 等气溶胶光学辐射特性产品, 并且这些气溶胶光学特性反演产品都具 有较小偏差, 表明气溶胶组分反演方法能够更好地对观测数据实现拟合, 获得更丰富更精确的气溶胶卫星反演产品, 为进一步优化算法并提供更加精确的卫星产品奠定基础。

Evaluation of accuracy of aerosol optical and radiative products retrieved by aerosol component method

Based on the POLDER-3 multi-angle polarimetric observation data from 2005 to 2013, the global aerosol comprehensive products are obtained through the newly developed aerosol component method which enables simultaneous inversion of aerosol optical properties and component information, and then the AERONET (Aerosol Robotic Network) global site observation data are used to validate and comprehensively evaluate the retrieval of aerosol optical property products, and the applicability and superiority of the component retrieval approach are also discussed. The overall validation results show that the quality of spectral AOD derived by the aerosol component approach from POLDER measurements is comparable to AERONET measurements. In addition, the polarimetric observations based on aerosol component approach can provide more information on aerosol properties, such as spectral absorption AOD (AAOD) and Ångstrom exponent (AE) for di ¨ fferent band combinations (440/670 nm, 670/870 nm, 870/1020 nm, 440/1020 nm), and all these aerosol optical property products have fairly small biases, demonstrating that the algorithm is able to achieve a better fit to the observation data, which provides a basis for further improvement of the algorithm.