基于氧气A吸收带高光谱反射信息的气溶胶廓线反演算法及模拟反演验证

Retrieving Aerosol Extinction Profile with High Spectral Resolution Radiance in Oxygen A-band and Simulation Research

为反演对流层气溶胶消光系数廓线,提出了一种新的、基于氧气A光谱吸收带高光谱反射信息的反演方法。这种方法在经典的线性约束反演算法的基础上引入了两个与气溶胶柱光学厚度相关的订正因子,通过实现目标廓线和反演廓线的光学柱厚度差异最小,进而动态选择拉格朗日系数。为验证新方法的有效性和精度,借助了CALIPSO(Cloud-Aerosol Lidar and Infrared Path-finder Satellite Observations)气溶胶廓线产品和高光谱辐射传输模拟,模拟反演海洋下垫面晴空和沙尘两种情景下气溶胶消光系数廓线,结果表明新的方法能够比较准确地获得对流层内气溶胶廓线的数值,尤其在多次散射比较强的沙尘条件下,相对误差能够控制在51%以下;在晴空时,相对误差能够控制在20%以下。如果加入订正信息,反演精度能够进一步提高。

A new kind of tropospheric aerosol extinction coefficient profile retrieval method with hyper-spectral（0.05 nm） reflected information in oxygen A band is presented.The advantage of this novel method is the Aerosol Optical Depth（AOD） restriction is considered.As two correction factor M and D are introduced,Lagrange multiplier could be chosen automatically and the precision of retrieval increased.To test this method,we do the simulation retrieval with the help of CALIPSO Level 2 aerosol products and new hyper-spectral resolution RT model.Two types of aerosol scene are selected：dust event and clean condition.For dust event,the relative retrieval error is 51%,while in clean condition,the error could be controlled under 20%.If revise profile is added,the retrieval precision will be much better.