【摘要】 将多普勒天气雷达探测到的降水粒子的回波强度数据转化为相对湿度值,对同一时刻MM5模式初始场中的相对湿度值进行订正。多次模拟试验结果表明:通过修正模式初始场在雷达回波区域的水汽条件,使该区域初始场底层能量升高、对流不稳定性加强。从而对回波下游区域降水中心位置和降水量级的预报有所改进。本文以山东临沂2004年7月16日暴雨过程和2005年6月14日冰雹过程为例,阐述试验过程及试验结果。更多还原

【Abstract】 In this paper Doppler radar echo intensity values are converted into the relative humidity values,which are used to replace the relative humidity values of the same time in the MM5 initial fields.The result shows that by improving the model initial moisture conditions in the regional radar echoes,the energy was increased at the initial bottom,and the instability of convection was strengthened.Taking advantage of this,we can improve the precipitation forecast of the echo downstream region.The simulation experimentation is made to validate the method.The examples are a heavy rainfall event on July 16,2004 and a hail event on June 14,2005 in Linyi,Shandong.更多还原