新一代天气雷达晴空回波反射率因子特征分析  

Characteristic Analysis of Reflectivity Factor of Clear Air Echoes of Doppler Weather Radars

作　　者：陈亚军 梁海河[2] 张乐坚[2] 文浩[2] 张林[2] 叶飞 张骞[2,3] CHEN Yajun;LIANG Haihe;ZHANG Lejian;WEN Hao;ZHANG Lin;YE Fei;ZHANG Qian(Inner Mongolia Autonomous Meteorological Bureau,Hohhot 010051;CMA Meteorological Observation Center,Beijing 100081;Shandong Province Meteorological Bureau,Jinan 250031)

机构地区：[1]内蒙古自治区气象局,呼和浩特010051 [2]中国气象局气象探测中心,北京100081 [3]山东省气象局,济南250031

出　　处：《气象科技》2022年第3期303-313,共11页Meteorological Science and Technology

摘　　要：本文基于新一代天气雷达、地面自动站、探空资料和卫星资料,综合利用天气雷达反射率因子和气象要素等资料分析了晴空回波的特征。结果表明:我国不同地域(华北、华中、华东和华南)晴空回波具有明显的日变化和年变化特征,具体表现为每年的春秋两季天气雷达可探测到明显的晴空回波,而且晴空回波主要出现在傍晚到第2天清晨之间。进一步的分析表明雷达探测的晴空回波和折射指数的涨落关系密切,此外逆温层和高湿区的存在也与雷达是否能够探测到晴空回波存在较高的相关性。Based on the data of Doppler weather radars,automatic weather stations,radiosondes and satellites,the characteristics of clear air echoes in terms of reflectivity are analyzed using weather radar reflectivity factor and meteorological elements.The results show that the clear air echoes in different regions of China(North China,Central China,East China and South China)have obvious diurnal and annual variations.The specific performance is that the weather radar in the spring and autumn can detect obvious clear air echoes,which mainly appear between the evening and the following day.Further analysis shows that the clear air echoes detected by radars are closely related to the refractive index fluctuation.In addition,the presence of the inversion layer and the high-humidity region also has a high correlation with clear air echoes detected by weather radars.

关 键 词：晴空回波 气象要素 湍流 

分 类 号：P412[天文地球—大气科学及气象学]