雷达体扫反射率场的自动质量控制  

Automatic Quality Control for Radar Volume-Scanning Reflectivity Fields

作　　者：王佑兵[1] 万玉发[1] 

机构地区：[1]中国气象局武汉暴雨研究所,武汉中心气象台武汉430074

出　　处：《气象科技》2006年第5期615-619,I0006,共6页Meteorological Science and Technology

基　　金：湖北省科技攻关计划课题(2004AA306B01);国际科技合作课题(2005CA012);湖北省气象局科技发展基金项目(2003ZZ01)资助

摘　　要：研究探讨了从雷达反射率三维结构(回波的垂直伸展、水平纹理、垂直梯度等)特征识别降水和非降水回波以及对非降水回波自动剔除和降水损失补偿的实时质量控制方法;同时利用武汉CINRAD/SA雷达364次体扫资料研究分析了降水和非降水的水平纹理(T)和垂直梯度(V)的分布特征及其判据指标。统计分析表明,99%的降水和3%的杂波落入8 dBz/km之内的区域,在150 km范围可以仅用V判据参数;另外,降水和杂波虽然分别倾向于T的低值和高值区,但没有V值表现明显,在150 km外采用T参数结合平均强度计算的方法来识别降水与非降水。Radar reflectivity quality control is essential to objective quantitative technique such as precipitation estimation and severe weather automatic identification. The. automatic real-time quality control method is studied for distinguishing and removing non-precipitation echoes by three-dimensional structure features of CINRAD/SA reflectivity fields （namely, the vertical extent of radar echoes, the horizontal texture of reflectivity and the vertical gradient of intensity） and for compensating for the loss of precipitation echoes. The distribution characteristics and criterions of horizontal structure （T） and vertical gradient （V） of precipitation and non-precipitation are analyzed by using the base-level data from 364 volume scans of the Wuhan CINRAD/SA weather radar. The statistical results show： ①The vertical gradient parameter may be used as the only index to identify precipitation and non-precipitation within 150 km, where the V value is less than 8 dBz/km for accumulative 99 % precipitation and 3 % clutter echoes.②Though T of precipitation echoes is inclined to small value while clutter echoes to large value, the trend of T is less obvious than that of V. ③In the area out of 150 kin, the method of combin- ing T with average reflectivity is used to distinguish precipitation from non-precipitation.

关 键 词：天气雷达 体扫反射率 质量控制 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]