新一代天气雷达谱宽资料分析晴空回波特征的探讨  

Characteristics of the Spectral Width of CINRAD Clear-Air Echo before Severe Weather

作　　者：耿建军[1] 顾松山[1] 陈钟荣[1] 黄兴友[1] 夏文梅[2] 

机构地区：[1]南京信息工程大学遥感学院 [2]江苏省气象科学研究所,江苏南京210008

出　　处：《南京气象学院学报》2007年第6期814-818,共5页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40475017)

摘　　要：根据广州强对流天气发生前新一代天气雷达(CINRAD/SA)观测的晴空回波谱宽资料,经过数据质量控制和预处理,估算了不同高度的湍流耗散率,发现这次强对流天气过程发生前,低层的湍流耗散率明显增强,揭示了这次强对流天气过程的前兆特征。A series of severe convective storms affected Guangdong Province and produced disastrous heavy rain in Guangzhou especially on August 11,2004. This paper introduces the elementary formation mechanisms for clear air-echo before severe convection and trys to extract the dissipation rate of turbulent energy 8 from the spectral data of CINRAD/SA in Guangzhou. The results show that the turbulence energy dissipation rate in the low atmosphere layer obviously increased before the severe convective storms occurred, which reveals the precursory character of this weather phenomena.

关 键 词：新一代天气雷达 晴空回波 谱宽 湍流耗散率 

分 类 号：P412[天文地球—大气科学及气象学]