降水-雾过程毫米波雷达探测分析

运用毫米波雷达探测对2017年4月15日夜间造成低能见度天气的降水-雾过程进行了特征分析.水平分布特征分析得出该降水-雾过程空间尺度约为15 km,雷达回波强度范围为-20～25 dBz.对该过程的垂直结构进行分析后显示,此过程经过时,近地面经历了由降水到雾的一系列转变过程.对雷达径向速度的分析显示过程的主体结构较稳定...

Analysis of a Precipitation-Fog Process Detected by Millimeter-Wave Radar

The characteristics of a precipitation-fog process,which caused the occurrence of low visibility weather,were analyzed by using the imagery of millimeter-wave radar detection.The analysis of horizontal distribution characteristics of the process showed that its spatial scale was about 15 km,and the radar wave intensity ranged from-20 dBz to 25 dBz.We also analyzed the vertical structure of the process,finding that the process experienced a series of varying processes from precipitation to fog as it passed through the radar-scanned region.The analysis of radar radial velocity suggests that the main structure of the system was stable,and the edge area was compensated for the main area,so that the system could maintain and develop.The visibility began to decline when the process was approaching the visibility stations,and reached the minimum value when the process was about to leave.The visibility became better after the process left for a period of time,and no effective precipitation was observed in the millimeter-wave radar scanning area during the process.In addition,according to the empirical formula,the relationship between low-level radar reflectivity intensity and near-surface visibility in this process was well simulated, and thespecific formula was Vis=2.283Z ^-0.121 .