摘要
超强台风"尤特"登录期间,阳江新一代天气雷达产品呈现地物凸显、速度模糊的异常现象,该异常回波会使天气预报员对雷达回波发展趋势做出错误判断。本文通过雷达基数据的反演,结合当地中尺度自动气象站资料,从雷达产品算法角度解释了地物凸显和速度模糊的原因。针对地物加强,提出了通过动态计算噪声来抑制回波强度和使用反射率垂直廓线识别地物的两种解决办法;针对速度模糊,通过使用退模糊算法和不使用退模糊算法得到的速度产品做对比分析,提出了强台风天气时速度产品使用的建议,以便预报员更加合理的使用雷达产品。
During landfall of super typhoon Utor,Yangjiang NEXRAD products showed severe ground clutter and velocity ambiguity.This anomaly would let the weatherman make wrong judgment on the radar echo trends.Based on the radar data retrieval and combined with the data of local mesoscale automatic weather station,this paper explains the reasons for the prominent surface features and speed blur from the perspective of the radar product algorithm.Aiming at the severe ground clutter,the paper proposes to suppress the echo intensity with dynamic noise and identify ground clutter by using reflectivity vertical profiles.For velocity ambiguity,the products are made a comparison by using the fuzzy algorithm or not.The suggestions on velocity diagram application under the strong typhoon weather are presented,which is helpful to use radar products reasonably for weatherman.
出处
《气象水文海洋仪器》
2014年第4期12-16,20,共6页
Meteorological,Hydrological and Marine Instruments
基金
广东省气象科技项目"基于WEB的雷达故障案例采集与处理平台"(2012B36
项目负责人:郭泽勇)
广东省科技项目"天线角码跟踪技术在天气雷达监控中的应用"(2012B18
项目负责人:李建勇)
关键词
大气探测
新一代天气雷达
雷达产品
地物
速度模糊
atmospheric sounding
NEXRAD
radar products
ground clutter
velocity ambiguity
