利用被动差分吸收光谱仪观测的Ring效应研究气溶胶光学特性

气溶胶在大气辐射和气候变化研究中占有重要地位，其中气溶胶光学特性的确定是准确估算其辐射强迫的前提条件。地基被动差分吸收光谱（DOAS）技术是近年来发展起来的可以同时探测痕量气体和气溶胶柱浓度及廓线的技术，如光学厚度和垂直分布。然而对于其它如相函数、单次散射反照率等对辐射计算有重要影响的光学参数尚难以确定。本研究利用地基被动DOAS观测的Ring效应开展气溶胶光学特性的测量研究，Ring效应是由大气中的旋转拉曼散射引起，依赖于光子传输路径和散射过程。通过观测与辐射传输模型相结合，分析Ring效应在不同大气条件以及观测姿态下对气溶胶光学参数的敏感性关系，确定各气溶胶光学参数的最佳测量方法，结合辐射模型和迭代优化算法，使通过地基被动DOAS观测可以获得更多的气溶胶光学参数（光学厚度、相函数、单次散射反照率）。为估算气溶胶辐射强迫效应提供更准确的数据依据，同时为大气化学模型提供更准确的输入参数。

Aerosol plays an important role in atmosphere radiation and climate change research, and its optical property is a precondition for the estimation of the forcing of aerosol on radiation. Passive Differential Optical Absorption Spectroscopy (DOAS) has recently become a new remote sensing technology in the determination of concentration and profile of trace gas and aerosol, including aerosol optical depth and extinction coefficient vertical distribution. However it is still hard to retrieve some aerosol optical properties which have important effect on the radiation calculation, as phase function and single-scattering albedo. .In this project, observation of the Ring effect by passive DOAS is used to determine the aerosol optical properties. The Ring effect is caused by rotational Raman scattering in the atmosphere, and depends on the photon transmission path and the scattering processes. Combining the measurements and the radiative transfer simulations, the sensitivity study of the Ring effect on aerosol optical properties under different atmospheric conditions and observation geometry is carried out. The measurement method is studied to obtain aerosol optical properties by using the Ring effect. These are used to determine the aerosol optical properties (optical depth, phase function, single scattering albedo, etc.) by the passive DOAS observations. This project offers more accurate data for estimating the aerosol radiative forcing effect, and input parameters for the atmospheric chemistry model.