利用反射率因子垂直廓线填补雷达波束遮挡区的方法研究  

Filling- Up of Occultation Regions Using Vertical Profile of Reflectivity Factor

作　　者：杨泷[1,2] 刘黎平[1] 王红艳[1] 

机构地区：[1]中国气象科学研究院,北京100081 [2]成都信息工程学院,成都610225

出　　处：《气象科技》2015年第5期788-793,共6页Meteorological Science and Technology

基　　金：国家科技支撑计划项目(2012BAC22B00);中国气象科学研究院基本科研业务费专项项目(2011Y003)共同资助

摘　　要：新一代天气雷达很多位于地形复杂的山区,地形遮挡形成观测盲区,严重影响了新一代天气雷达数据的应用效果。利用基于高分辨率地形数据计算的波束遮挡信息,依据反射率因子垂直廓线,由高仰角无遮挡的反射率因子观测数据得到低仰角完全遮挡区的数据。以杭州雷达为例,通过直接对比反射率因子值和对比填补前后雷达估算降水效果两种途径检验了填补效果,结果表明:填补与观测"真值"有很好的一致性,填补后降水估算效果优于填补前。本文提出一种填补低仰角完全遮挡区的方法,适用于均匀性降水系统。Many new-generation weather radar sets are located in mountainous areas with complex terrain in China, and the terrain occultation results in blind zones of detection, which influences the application of radar echo data seriously. A method of using the vertical profile of reflectivity factor to fill up occultation regions of lower elevation, applicable to stratiform precipitation, is introduced, which uses the beam blockage based on DEM data to confirm the rate of echo occultation and uses the data of high-elevation zero occultation regions to obtain that of the low-elevation complete occultation regions according to the changes of reflectivity with height in the vertical profile of reflectivity. Taking Hangzhou radar as an example, the results are verified through comparing the revised reflectivity and original reflectivity and comparing radar precipitation estimations before and after revision. The results show that the revised and original radar echoes have good consistency, and the revised reflectivity is better than the original in quantitative precipitation estimation

关 键 词：天气雷达 波束遮挡 反射率因子垂直廓线 完全遮挡区 

分 类 号：P412.25[天文地球—大气科学及气象学]