In this paper,it is shown that the differential reflectivity Z_(DR) is related to drop size distribution(DSD)and the spectral shape variation of different truncated diameters.Z_(DR) is a sensitive function to variatio...In this paper,it is shown that the differential reflectivity Z_(DR) is related to drop size distribution(DSD)and the spectral shape variation of different truncated diameters.Z_(DR) is a sensitive function to variation of DSD of the spectra.The effects of shape variation of DSD on rainfall can be deduced with a(Z_H,Z_(DR))dual-parameter technique,which is effective to improve the accuracy of rainfall measurement and is of the priority of identifying large particles of hydrometeors(especially hailstone)from the rain region.展开更多
利用广州双偏振天气雷达和自动气象站资料,对2016年5月10日影响广州地区的一次短时强降水过程的双偏振参量进行了分析,结果表明:短时强降水的差分反射率因子(ZDR)、差分相移率(KDP)都随着回波强度(ZH)的增加而增大,最大值分别达到了4 d ...利用广州双偏振天气雷达和自动气象站资料,对2016年5月10日影响广州地区的一次短时强降水过程的双偏振参量进行了分析,结果表明:短时强降水的差分反射率因子(ZDR)、差分相移率(KDP)都随着回波强度(ZH)的增加而增大,最大值分别达到了4 d B和4(°)/km;选择了10个1 h雨量>50 mm的自动站点,计算其对应的ZDR平均值在1.25~1.66 d B之间,最大值在1.65~3.19 d B之间;KDP的平均值在0.8~1.48(°)/km、最大值在1.8~2.4(°)/km之间;相关系数的平均值都在0.95以上,最大值接近于1。较大的ZDR和KDP值表明降水粒子谱中含有大量较大的水滴,是造成该次短时强降雨的主要原因。展开更多
As a study on exploiting and popularizing the advanced dual-polarization weather radar technique in China,the physical mechanism for the propagation effect of the radar wave is discussed by using the widely adapted ex...As a study on exploiting and popularizing the advanced dual-polarization weather radar technique in China,the physical mechanism for the propagation effect of the radar wave is discussed by using the widely adapted extended boundary condition method,and some theoretic results are provided for improving rain measurement accuracy.Furthermore,phase information, another important characteristic quantity of microwave,is considered for tapping the potentialities of the new meteorological radar system.展开更多
基金National Disaster Reduction Foundation(96-020-01-07)of China,KZ 951-B1-405 Western Brilliance of the Chinese Academy of Sciences.
文摘In this paper,it is shown that the differential reflectivity Z_(DR) is related to drop size distribution(DSD)and the spectral shape variation of different truncated diameters.Z_(DR) is a sensitive function to variation of DSD of the spectra.The effects of shape variation of DSD on rainfall can be deduced with a(Z_H,Z_(DR))dual-parameter technique,which is effective to improve the accuracy of rainfall measurement and is of the priority of identifying large particles of hydrometeors(especially hailstone)from the rain region.
文摘利用广州双偏振天气雷达和自动气象站资料,对2016年5月10日影响广州地区的一次短时强降水过程的双偏振参量进行了分析,结果表明:短时强降水的差分反射率因子(ZDR)、差分相移率(KDP)都随着回波强度(ZH)的增加而增大,最大值分别达到了4 d B和4(°)/km;选择了10个1 h雨量>50 mm的自动站点,计算其对应的ZDR平均值在1.25~1.66 d B之间,最大值在1.65~3.19 d B之间;KDP的平均值在0.8~1.48(°)/km、最大值在1.8~2.4(°)/km之间;相关系数的平均值都在0.95以上,最大值接近于1。较大的ZDR和KDP值表明降水粒子谱中含有大量较大的水滴,是造成该次短时强降雨的主要原因。
文摘As a study on exploiting and popularizing the advanced dual-polarization weather radar technique in China,the physical mechanism for the propagation effect of the radar wave is discussed by using the widely adapted extended boundary condition method,and some theoretic results are provided for improving rain measurement accuracy.Furthermore,phase information, another important characteristic quantity of microwave,is considered for tapping the potentialities of the new meteorological radar system.
