Observational Study on the Real-Time Vertical Profile of Reflectivity by the Yichang's Doppler Radar in Summer
Based on the volume scan data from the Doppler radar deployed in Yichang, and nearly simultaneous 10-minutes precipitation from 7 gauges distributed within 100 km centered radar's position, The real time characteristics of vertical profile of radar reflectivity (VPR) during the two time periods of regional intensive mixing precipitation in June and July in 2002 are analyzed. The VPRs clearly show the vertical structures of bright band of zero-temperature layer over the selected area, together with the vertical variations of the echoes, types of the precipitations, and physical status of the particles in the precipitation-cloud etc. The information from VPRs could be applied to analyze the types of the precipitation, and the evolution of particles in the cloud. There are agreements among the variations of VPRs detected at middle or low elevation angles in the continuous volume scans, echoes of PPI images exactly located over the gauge sites, and the 10-minutes amount of precipitation recorded by gauges, and these agreements are useful to estimate the amounts, types, and the evolutions of precipitation over the sites where the gauges are absent. Intensive convective precipitation usually occurred over the regions that VPRs detected together with no bright band, the big reflectivity factors, and the bigger reflectivity factors, the lower elevation angles.