两次大气波导CINRAD/SA雷达超折射回波分析  

Analysis on the two cases of atmospheric duct and CINRAD/SA super-refraction echoes

作　　者：赵瑞金[1,2] 温国利 

机构地区：[1]河北省气象台,石家庄050021 [2]河北省气象局河北省生态环境监测实验室,石家庄050021 [3]邢台市气象局,河北邢台054000

出　　处：《气象科学》2010年第3期393-401,共9页Journal of the Meteorological Sciences

摘　　要：利用石家庄CINRAD/SA型多普勒天气雷达资料,结合探空实况对2006年9月5日和2005年11月21日的CINRAD/SA雷达超折射回波、气象条件、及大气波导进行了对比,并对不同类型的大气波导的电磁波传播情况进行了分析。结果表明:电磁波在华北平原有利的气象条件下能够形成大气波导传播,大气波导层使得CINRAD/SA雷达杂波增加,产生超折射回波。大气波导影响超折射回波的强度和分布,2006年9月5日由于雷达站上空存在表面波导,形成了2层模式超折射回波;2005年11月21日雷达站上空存在抬升波导,形成了3层模式超折射回波。超折射回波目标的视在位置与实际位置存在偏差,特别是高度偏差较大。受太行山地形影响,超折射回波主要分布在东部平原地区。Based on the CINRAD/SA Doppler radar and sounding data,the super-refraction radar echoes,meteorological condition,and atmospheric duct of the two cases that took place respectively on September 5,2006,and November 21,2005 in the north China plain,are compared in this article.The transmission paths of radio in different kinds of atmospheric duct are also analyzed.The results indicate that atmospheric duct transmission of radio can be formed under favorable meteorological condition.Atmospheric duct increases clutter radar echoes,and forms super-refraction radar echoes.The atmospheric duct affects the intensity and distribution of super-refraction echoes.On September 5,2006,there is superficial duct in the atmosphere over Shijiazhuang radar site,and forms 2 level mode super-refraction radar echoes.On November 21,2005,there is raising duct in the atmosphere over radar site,and the super-refraction radar echoes are 3 level mode.The super-refraction radar echoes bring more measuring errors,especially in the height.Super-refraction radar echoes are mainly distributed in the region of east plain because of Taihang Mountain relief.

关 键 词：超折射 大气波导 CINRAD/SA 

分 类 号：P412[天文地球—大气科学及气象学]