【摘要】 将雷达50 km探测半径的可视范围分为4个区域,分别获取平均反射率因子垂直廓线,确定与对应区域的雨量计匹配最佳的平均反射率因子廓线上的Z值;同时获取雷达波束被阻挡地区各雨量计高空平均反射率因子垂直廓线,并寻找该廓线与可视区域内的平均反射率因子垂直廓线相关性最好的廓线,以及被阻挡区域的Z值对应的最佳匹配高度上的Z值,对其进行降水估计。采用安徽合肥雷达站和雨量计站点资料进行试验,并进行误差分析,结果表明:利用最佳匹配方法得出的平均反射率因子垂直廓线上的Z值对雷达波束被阻挡区域的降水估计效果有一定改进。更多还原

【Abstract】 According to the concept of optimum space-matching between ground rain rate,I,and radar reflectivity factor,Z,for a certain vertical reflectivity profile,this paper presents a method to determine the optimally matched vertical profile of reflectivity for estimating stratiform cloud precipitation in ground clutter areas.The unblocked part of the vertical profile of reflectivity in ground clutter area is first used to find a best partial correlated vertical profile of mean reflectivity from the unblocked areas,and the both are combined to estimate the surface precipitation in the ground clutter area.The varification of estimation error against the raingauge-observed rain rate in the ground clutter area in the stratiform cloud precipitation event on June 18,2004 in Anhui Province suggest that the method is applicable in operational rain estimation.更多还原