光学学报, 2017, 37 (10): 1001006, 网络出版: 2018-09-07
大气气溶胶谱分布的多波长拟合模拟反演 下载: 963次
Multi-Wavelength Fitting Simulation and Inversion of Atmospheric Aerosol Spectrum Distribution
大气光学 气溶胶 谱分布 非线性拟合 激光雷达 多波长 atmospheric optics aerosol spectrum distribution nonlinear fitting lidar multi-wavelength
摘要
在构建355,532,1064 nm 3个波长的后向散射效率因子与355 nm和532 nm两个波长的消光效率因子查算表的基础上,正演计算出气溶胶的3个波长的后向散射系数与两个波长的消光系数(3β 和2α )。通过非线性拟合,模拟反演了对数正态单峰分布情况下气溶胶的谱分布参数。结果表明:该方法可以反演得到单峰分布的气溶胶谱分布参数,不同初始值对反演结果的影响较小;复折射指数对气溶胶谱分布的反演起重要作用,当复折射指数的实部和虚部分别具有±1步长范围内的不确定性时,反演得到的粒子数浓度、几何标准偏差和峰值半径3个参数的相对误差分别为20.32%、33.50%和24.72%,其中实部比虚部的误差贡献更大。该研究为多波长激光雷达反演气溶胶谱分布垂直廓线的研究提供了理论基础。
Abstract
On the basis of constructing the lookup-table of the backscattering efficiency factors of three wavelengths (355,532,1064 nm) and the extinction efficiency factors of two wavelengths (355 nm and 532 nm), the aerosol backscattering coefficients of three wavelengths and the extinction coefficients of two wavelengths (3β and 2α) are calculated. The inversion of spectrum distribution parameters of unimodal log-normal aerosol is simulated by nonlinear fitting. Results show that the spectrum distribution parameters of unimodal log-normal aerosol can be successfully inversed by this method. The effects of the different initial values on inversion results are small. The complex refractive index plays an important role in the inversion of the aerosol spectrum distribution. When the real and imaginary parts of the complex refractive index have the uncertainty of +1 and -1 step length respectively, the relative errors of the number concentration of particles, geometrical standard deviation and median radius are 20.32%, 33.50% and 24.72% respectively. The real part of the complex refractive index brings greater error than imaginary part. The study provides a theoretical foundation for the study of inversing vertical profile spectrum distribution of aerosol with multi-wavelength lidar.
徐继伟, 刘东, 谢晨波, 王珍珠, 王邦新, 钟志庆, 马晖, 王英俭. 大气气溶胶谱分布的多波长拟合模拟反演[J]. 光学学报, 2017, 37(10): 1001006. Jiwei Xu, Dong Liu, Chenbo Xie, Zhenzhu Wang, Bangxin Wang, Zhiqing Zhong, Hui Ma, Yingjian Wang. Multi-Wavelength Fitting Simulation and Inversion of Atmospheric Aerosol Spectrum Distribution[J]. Acta Optica Sinica, 2017, 37(10): 1001006.