基于数值模式订正背景场的多普勒雷达径向速度退模糊的改进  

Improvement of the Doppler radial velocity dealiasing algorithm based on the background information from numerical models

作　　者：王学森 杨毅[1] 甘茹蕙 杨志达 WANG Xue-sen;YANG Yi;GAN Ru-hui;YANG Zhi-da(Key Laboratory of Climate Resource Development and Disaster Prevention for Gansu Province,College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学大气科学学院,甘肃省气候资源开发及防灾减灾重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2023年第2期205-213,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点研发计划项目(2017YFC1502102)。

摘　　要：针对多普勒雷达径向风存在速度模糊的问题,提出一种基于数值模式背景场信息且对背景场信息再订正的雷达径向速度退模糊方法.利用中尺度数值模式模拟大气三维风场并将其作为背景场,基于背景参考和连续性原理对背景场进行多次风速偏差订正,使用订正后的背景场对雷达径向速度进行退模糊.针对两次台风个例进行多普勒天气雷达径向风的速度退模糊试验.结果表明,经过多次偏差订正的模式背景风场与观测的径向风偏差较小,能够较好地实现速度退模糊效果,避免径向速度大片区域无法退模糊或错误退模糊的问题,模糊区域径向速度廓线的不合理突变得到有效纠正,并能够在雷达各个仰角有效纠正一次模糊和二次模糊。To address the problem of velocity ambiguity in the radial velocity of Doppler radar,a radial velocity deblurring method was proposed based on the background field information of numerical models and the re-revision of the background field information.The method worked via a simulation of the three-dimensional atmospheric wind field using the mesoscale numerical model as a background field,revising the background field for several wind speed deviations based on the background reference and continuity principles,and using the revised background field to deblur the radial velocity.The velocity deblurring tests and examinations of the radial winds of Doppler weather radar were carried out for two typhoon cases,and the results showed that the deviation of the background wind field from the observed radial velocity was small after multiple deviation revisions,and the velocity deblurring effect could be better achieved,avoiding the problem that large areas of the radial velocity cannot be deblurred or are wrongly deblurred,and the unreasonable abrupt changes of the radial velocity profile in the blurred area were effectively corrected.The method can effectively correct the primary and secondary blur in each elevation angle of the radar.

关 键 词：中尺度数值模式 速度退模糊 偏差订正 径向风 背景风场 

分 类 号：P413[天文地球—大气科学及气象学]