摘要
使用Mie散射激光雷达在阴、雾和晴三种天气状况下采集了大气回波信号,从所测数据反演气溶胶消光系数的过程中发现,气溶胶后向散射消光对数比对反演结果存在较大影响。在阴天天气下,当后向散射消光对数比从0．7变化到1．0时,气溶胶消光系数反演结果相差近5倍;对晴天天气,反演结果相差近3倍; 而在有雾天气,其反演结果变化不大。通过参考大气能见度因子对消光系数进行修正,并从而获得对应的后向散射消光对数比,给出了一种根据天气状况确定气溶胶后向散射消光对数比的新方法。实际反演计算表明,用此方法可获得与实际更为接近的气溶胶消光系数。
By using Mie scattering lidar, return signals in cloudy, foggy and sunny weather are measured. In the process of inversion, selection of the logarithmic ratio of aerosol backscatter- to-extinction has a large effect on extinction coefficient. For cloudy weather, when the logarithmic ratio of aerosol backscatter-to-extinction changes from 0.7 to 1.0, the change of aerosol extinction coefficient is 5 times, for sunny weather, the change is near 3 times, whereas for foggy weather, the change is not much. Using visibility data obtained by meteorological observation, corresponding logarithmic ratio of aerosol backscatter-to-extinction is obtained. A new type of method for deciding logarithmic ratio of aerosol backscatter-to-extinction based on weather conditions is proposed. The corrected results are close to the real atmospheric conditions.
出处
《量子电子学报》
CAS
CSCD
北大核心
2006年第3期335-340,共6页
Chinese Journal of Quantum Electronics
基金
国家自然科学基金资助(60078020
60478044)
关键词
大气光学
激光雷达
气溶胶消光系数
后向散射消光对数比
大气能见度
atmospheric optics
lidar
aerosol extinction coefficient
logarithmic ratio of aerosol backscatter-to-extinction
atmospheric visibility
