激光与光电子学进展, 2017, 54 (1): 012802, 网络出版: 2017-01-17
激光雷达反演气溶胶光学特性的k值准确度研究 下载: 662次
Accuracy of Value k in Aerosol Inversion Optic Properties Based on Lidar
遥感 激光雷达 太阳光度计 气溶胶消光系数 能见度 remote sensing lidar sun-photometer aerosol extinction coefficient visibility
摘要
激光雷达方程求解时将后向散射消光对数比k作为假设值, 推导了k与波长指数、探测波长及气溶胶消光系数之间的关系式, 提出了一种确定k值的新方法。利用532 nm 瑞利拉曼-米氏散射激光雷达及微脉冲激光雷达, 结合CE-318太阳光度计观测数据,对k在不同天气条件下的取值进行了初步研究, 引入能见度因子, 估算气溶胶消光系数, 对该方法进行验证。结果表明: 空气状况良好时, 仅在k值取1.0时气溶胶消光系数更接近能见度估算的结果; 在雾霾天气下, 由该方法计算的k值范围在0.7~0.9时所得到气溶胶消光系数反演结果与能见度估算值的相对误差达到最小, 这说明在雾霾天气下, 该方法计算k值具有一定的可靠性。
Abstract
Logarithmic ratio k of aerosol backscatter-to-extinction is usually as an assumed value in solving lidar equation. The relationship expression among value k, wavelength exponent, measurement wavelength and aerosol extinction coefficient is derived. A new method to determine value k is put forward. The value of k under different weather conditions is initially analyzed by using the data of 532 nm Rayleigh-Raman-Mie lidar and micro pulse lidar and combining CE-318 sun-photometer data. To verify this method, the visibility is brought to estimate the actual condition of aerosol extinction coefficient. It shows that under better air condition, aerosol extinction coefficient is closer to the result estimated by visibility only in k=1.0, and under foggy weather, when the value of k calculated by this method changes from 0.7 to 0.9, the relative error between aerosol extinction coefficient and result estimated by visibility reaches the minimum. It shows that the calculating value of k using this method has certain reliability.
孙海波, 曹念文. 激光雷达反演气溶胶光学特性的k值准确度研究[J]. 激光与光电子学进展, 2017, 54(1): 012802. Sun Haibo, Cao Nianwen. Accuracy of Value k in Aerosol Inversion Optic Properties Based on Lidar[J]. Laser & Optoelectronics Progress, 2017, 54(1): 012802.