气象2018，Vol.44Issue(4)：526-537,12.DOI:10.7519/j.issn.1000-0526.2018.04.006
晴空回波的大气风温湿结构及双偏振雷达参量分析
Analysis of Atmospheric Wind,Temperature and Humidity Structure and Dual-Polarization Radar Parameters of Clear Air Echo
摘要
Abstract
Clear air echo (CAE) helps to understand the structure of wind,temperature and humidity of the atmosphere;dual-polarization Doppler weather radar provides a wealth of information in detecting atmos-phere.In this paper,CAE of Nanjing University of Information Science and Techonogy,C-Pol dual-polari-zation radar in summer of 2015 is taken as cases to analyze the wind,temperature and humidity structure of atmosphere and the impact factors of CAE,combined with the sounding observations.The characteristics of radar reflectivity factor Z,radial velocity Vrand differential reflectivity factor ZDRof CAE are analyzed. The results show that the uneven distribution of refractive index caused by the temperature,pressure and humidity gradients and the turbulence enhancement induced by the background wind field can cause the clear sky echo.The echo mechanism is turbulent scattering.The differential reflectivity factor is affected by the Doppler effect.The ZD Rof CAE has different characteristics in different wind and air turbulence sit-uations.The results are helpful for better understanding the impact of atmospheric wind,temperature and humidity structure on radar electro-magnetic scattering and the quality control of radar data.关键词
晴空回波/双偏振雷达/湍流散射/大气风/温湿结构Key words
clear air echo(CAE)/dual-polarization radar/turbulence scattering/atmospheric wind/temperature and humidity structure分类
天文与地球科学引用本文复制引用
黄琴,魏鸣,胡汉峰,ABRO Mohammad Ilyas..晴空回波的大气风温湿结构及双偏振雷达参量分析[J].气象,2018,44(4):526-537,12.基金项目
国家自然科学基金项目(41675029)、国家重点基础研究发展计划(973计划)(2013CB430102)、地理信息科学教育部重点实验室开放研究基金资助项目(KLGIS2015A01)和中国气象科学研究院灾害天气国家重点实验室开放课题(2016LASW-B12)共同资助 （41675029）
