雨滴谱仪和天气雷达观测的反射率因子对比分析

摘要

利用Parsivel雨滴谱仪和新一代天气雷达对2012年沈阳地区一次短时暴雨过程进行了对比观测,对雨滴谱仪观测资料计算的反射率因子ZP进行分档统计,并与雷达RHI扫描资料计算的反射率因子Z进行对比分析.结果表明:对于2012年沈阳地区此次暴雨过程,雷达观测的回波强度存在低估现象,雨滴谱仪计算的各档反射率因子ZP均大于雷达观测的反射率因子Z;应用雷达单点和3点平均值进行统计,雷达观测的反射率因子分别平均偏低约8.30 dBz和8.64 dBz;观测仪器取样范围、资料时空匹配及谱宽变化是造成雨滴谱仪和天气雷达观测的反射率因子不一致的主要原因.%A Comparison observation between the Parsivel raindrop spectrometer and the new generation weather radar on a rainstorm occurring in Shenyang area in 2012 was conducted and the counted classifiable reflectivity factor ZP calculated with the raindrop spectrometer data was compared with the reflectivity factor Z calculated with the radar Range-Height Indicator data.The results show that for the rainstorm,the echo intensity of radar is underestimated and the reflectivity factor Zp is greater than Z.Based on the statistics of radar data at a single point and its 3-point average,the reflectivity factor Z is on average about 8.30 dBz and 8.64 dBz lower than the normal value respectively.The sampling range of observation instrument,temporal-spatial matching of data and the change of spectral width are the main reasons for causing the inconsistency between two kinds of reflectivity factors observed with the two devices.