Error of DIAL-measured Ozone Concentration and a Three-Wavelength Inversion Technique

Sensitivity of the error in the stratospheric ozone concentration measured by DIAL to the scattering property of the stratospheric aerosol is studied through both theoretical analysis and numerical experiment in this paper, and based on the sensitivity, a three-wavelength lidar inversion technique is proposed for a simultaneous determination of ozone concentration profile, aerosol backscatter coefficient profile and its size distribution in the stratosphere. It is found from the sensitivity study that there is a considerable effect of the stratospheric aerosol on accuracy of the ozone concentration solution. If the aerosol scattering is neglected, a large error of the solution can be obtained, especially when there is the stratospheric volcanic cloud, the error can be up to 100%. According to numerical experiments, a great improvement of the ozone concentration solution is obtained by using the present three-wavelenght inversion method.     

PRINCIPLE OF REMOTE SENSING OF ATMOSPHERIC AEROSOL SIZE DISTRIBUTION BY COMBINED SOLAR EXTINCTION AND FORWARD SCATTERING METHOD AND NUMERICAL EXPERIMENT

In this paper, the principle of inverting aerosol size distribution by solar spectral extinc-tion-forward scattering measurements is proposed and analyzed. Two methods of inversion——the segmental inversion and the combined one——are presented. Numerical experimentsshow that this method is quite successful in improving the accuracy of retrieved aerosolsize distribution in both smaller part (r<1μm) and larger part (r>1μm) of aerosolsize ranges.     

THEORETICAL ANALYSIS OF REMOTE SENSING OF AEROSOL REFRACTIVE INDEX BY ANGULAR SCATTERING METHOD

This paper introduces the functions representing quantitatively the sensitivity of the volume scattering function to the aerosol refractive index, points out the scattering angle regions where volume scattering function is more sensitive to the real part of refractive index or its imaginary part, and analyzes the correlativity between scattering channels. Furthermore, we have analyzed optimum channels of remote sensing of refractive index, and satisfactory inversion results have been obtained when the optimum channels were used in retrieving refractive index.     

消光-小角散射综合遥感气溶胶分布的原理与数值试验

本文根据核函数的特性,论述了消光-小角散射综合遥感气溶谱分布的原理以及分段反演和联立反演两种数学处理方法。数值试验表明:综合遥感能够发扬消光法和小角散射法的长处,克服各自的局限,既能提高大粒子的反演精度,又能改善小粒子的反演结果。     

角散射法遥感气溶胶折射率的理论分析

本文引进了体积散射函数对于折射率实部和虚部的敏感性函数,指出了体积散射函数对实部和虚部比较敏感的两个散射角区域,分析了角散射通道的相关性,根据敏感性和相关性的分析,选取比较合理的通道用于数值试验,取得了比较理想的反演结果。     

DIAL探测臭氧的误差及三波长激光反演技术

本文采用理论分析和数值试验相结合的方法,研究了激光探测的平流层臭氧浓度的误差对平流层气溶胶的散射特性的敏感性,并依据其敏感性,提出了一个同时探测气溶胶后向散射系数和谱分布以及臭氧浓度分布的三波长激光反演技术。