钠多普勒激光雷达回波光子数仿真及大气参数反演  

Simulation of echo-photon counts of a Sodium Doppler Lidar and retrievals of atmospheric parameters

作　　者：徐丽[1,2] 胡雄[1] 程永强[1] 郭商勇[1] 闫召爱[1] Xinzhao Chu 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100190 [2]北京宇航系统工程研究所,北京100076 [3]University of Colorado,429UCB,ECOT614,Boulder

出　　处：《地球物理学报》2010年第7期1520-1528,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金(40774087);航天领域高技术计划和中国科学院知识创新方向性项目(KGCX3-SYW-408)资助

摘　　要：钠多普勒激光雷达利用中层顶区域的钠原子作为示踪物,探测中层顶区域大气风场和温度剖面.本文主要分析钠多普勒激光雷达的探测原理和大气参数反演算法.利用MSISE和HWM93等大气模型给出背景大气温度、密度及风场,并给定钠原子数密度剖面,从激光雷达方程出发,模拟计算了激光雷达的瑞利散射和钠共振荧光散射回波光子数.利用模拟的回波光子数剖面数据,反演得到大气温度、视线风速和钠原子数密度剖面,反演结果与模拟计算用的背景参数符合很好,验证了这一反演方法的正确性.分析了激光频率偏移和激光线宽变化对反演精度的影响.The atmospheric winds and temperatures were retrieved with the received resonance fluorescence scattering photon echoes from Na atoms as a trace in the mesopause region. The lidar principle and the retrieval method of atmospheric parameters have been investigated. While the background temperature and density of atmosphere is given by atmospheric model MSISE and the background wind is given by HWM93 model, and the Na number density profile of the sodium layer is given with a Gaussian model, the lidar echo-photon counts can be simulated by using the lidar equations of Rayleigh scattering and sodium resonance fluorescence scattering. The retrieved winds and temperatures agree well with the given winds and temperatures, which shows that the retrieval method is reliable. The effects of laser frequency bias and variations of the laser linewidth on the accuracy of retrieval results are analyzed and presented.

关 键 词：钠多普勒激光雷达 回波光子数 温度和风场反演 

分 类 号：P412[天文地球—大气科学及气象学]