基于激光云高仪的雾和霾监测研究

Study on monitoring of fog and haze based on laser-ceilometer

文章在分析激光云高仪观测原理的基础上,结合人工实验观测数据和激光云高仪的后向散射强度数据,提出两种处理激光云高仪后向散射强度数据的方法,即对数运算法和固定阈值分割法。利用这两种方法,使激光云高仪在实现云高检测的同时又凸显了在雾、霾和降水等不同天气条件下近地面大气气溶胶的光学特性。研究表明,利用激光云高仪后向散射强度初值大小、垂直变化趋势和其随时间变化情况,可以实现激光云高仪对雾、霾和降水等特殊天气的实时监测。

Based on the analysis of the observation principle of the laser ceilometer and combining with the artificial experimental observation data and the backscattering intensity data of the laser altimeter,two methods for processing the backscattering intensity data of the laser ceilometer are proposed in this paper,which are logarithmic operation method and fixed threshold segmentation method.Using these two methods,the laser ceilometer can not only detect the cloud height but also highlight the optical characteristics of the near-surface atmospheric aerosol under different weather conditions such as fog,haze and precipitation.The results show that the real-time monitoring of fog,haze and precipitation by laser ceilometer can be realized by using the initial value,vertical trends and the changes with time of the backsatter intensity obtained by the laser ceilometer.