摘要
认识并消除雷达之间存在的回波强度差异对于跨雷达组网应用有重要价值。利用2012年7月北京、天津两部新一代天气雷达CINRAD降水回波强度的体扫资料,在两部雷达等距离剖面附近对观测值差异进行原因分析,从仰角、方位角、距离、地形、时间序列等角度,讨论匹配样本的一致性和差异特征。结果表明:北京、天津雷达工作状态良好,两者未发现系统性偏差,但两者的方位角可能存在1°左右的偏差;平原地区样本的一致性优于山地;除了距离相关因素(有效照射体体积、高度差异等),电磁波传播路径不同,大气云雨的积分衰减和折射影响不同,也是导致样本差异的原因。
Based on Beijing and Tianjin CINRAD/SA volume scan data from precipitation cases in July2012,the differences of radar reflectivity factors around the sample equal-distance cross-sections of two nearby radars are analyzed.Results show that no systematic bias is found between two radar sets.There exists one degree azimuth angle shift revealed from the rotating data and correlation analyze.Sample pairs at the plain area have better consistency than those in the mountain area.Beside distance,different propagation paths,the attenuation of the atmosphere,clouds and rainfall,and the refraction that causes echo height change are also reasons leading to differences in the sample pairs.
作者
李松如
李郝
刘晓阳
LI Songru;LI Hao;LIU Xiaoyang(Inner Mongolia Meteorological Service,Huhhot 010051;Department of Atmospheric and Oceanic Sciences,Peking University,Beijing 100871)
出处
《气象科技》
2020年第4期465-473,528,共10页
Meteorological Science and Technology
基金
国家自然科学基金(41475016)资助。
