测雨雷达反演雨滴谱剔除垂直气流方法的研究  

Research Methods of Removing Vertical Air Motions on the Retrieval of Rraindrop Size Distribution(DSD) by Precipitation Doppler Radar

作　　者：何思远[1,2] 刘晓阳[1] 孙大利[1,3] 

机构地区：[1]北京大学物理学院大气与海洋科学系 [2]中国白城兵器试验中心 [3]解放军91395部队

出　　处：《气象科技进展》2015年第4期45-52,共8页Advances in Meteorological Science and Technology

基　　金：公益性行业(气象)科研专项(GYHY201006037);国家自然科学基金项目(41075011)

摘　　要：在测雨多普勒雷达反演雨滴谱中,垂直气流对反演结果影响较大(下沉气流大于1m/s时,直径误差超过40%)。用平均末速度法估计垂直气流速度,反演雨滴谱。与地面雨滴谱对比观测表明,消除垂直气流影响后测雨雷达反演的雨滴谱分布更加合理,和地面雨滴谱仪的一致性更好,平均相对偏差减小8%以上;从通过雨滴谱计算的雨强分析,大雨强时偏差减小得更明显,平均达到25%。说明这种方法在测雨雷达反演雨滴谱中具有重要参考价值。Vertical air motions have a big impact on the retrieval of raindrop size distribution(DSD) by Precipitation Doppler radar.The method of average final velocity is applied to calculate speed of vertical air motions and DSD.On surface DSD comparison observations,the DSD retrieved by Precipitation Doppler radar is more reasonable after the influence of vertical air motions is eliminated,better at Parsivel DSD's consistency,and the average relative error is reduced by 8%.The effect is very obvious on rain rate,the average relative error is reduced by 25% in heavy rain rate.It is shown that the method of average final velocity has a certain reference value.

关 键 词：平均末速度法 雨滴谱反演 垂直气流 

分 类 号：P412.25[天文地球—大气科学及气象学]