A hail process in Huaihe River Basin observed by CINRAD Doppler radar on 12May 2000 has been simulated by using nonhydrostatic mesoscale numerical model MM5.The simulated wind field is analyzed and compared with Doppl...A hail process in Huaihe River Basin observed by CINRAD Doppler radar on 12May 2000 has been simulated by using nonhydrostatic mesoscale numerical model MM5.The simulated wind field is analyzed and compared with Doppler radar wind data,both of them show that there was a meso-β cyclone around the hail region.Results show that this meso-β cyclone existed below 3 km in the troposphere and its cyclonic circulation was very obvious below 1 km.The temperature and moisture fields from the simulation are also analyzed.Furthermore,the storm-relative environmental helicity and CAPE(convective available potential energy)are discussed.展开更多
根据2003年7月8日发生在甘肃省永登县境内的一次强单体冰雹过程,从天气学背景、雷达回波的演变特征出发,分析了该过程回波高度和含水量、高度和强度的跃增变化以及强单体特殊的结构特征。分析结果表明,垂直剖面上强反射率区的范围及伸...根据2003年7月8日发生在甘肃省永登县境内的一次强单体冰雹过程,从天气学背景、雷达回波的演变特征出发,分析了该过程回波高度和含水量、高度和强度的跃增变化以及强单体特殊的结构特征。分析结果表明,垂直剖面上强反射率区的范围及伸展高度对雹云的发展有重要作用。强反射率区对应着云中含水量集中区域,只有含水量累积区位于云中过冷区中时才利于冰雹的生长;一旦回波出现55 dB z并高度达到4 km以上,降雹随即产生;强单体雹暴是一种发展非常强烈,有着特殊结构的强雷暴。上述结果对冰雹预警有重要意义。展开更多
文摘A hail process in Huaihe River Basin observed by CINRAD Doppler radar on 12May 2000 has been simulated by using nonhydrostatic mesoscale numerical model MM5.The simulated wind field is analyzed and compared with Doppler radar wind data,both of them show that there was a meso-β cyclone around the hail region.Results show that this meso-β cyclone existed below 3 km in the troposphere and its cyclonic circulation was very obvious below 1 km.The temperature and moisture fields from the simulation are also analyzed.Furthermore,the storm-relative environmental helicity and CAPE(convective available potential energy)are discussed.
文摘根据2003年7月8日发生在甘肃省永登县境内的一次强单体冰雹过程,从天气学背景、雷达回波的演变特征出发,分析了该过程回波高度和含水量、高度和强度的跃增变化以及强单体特殊的结构特征。分析结果表明,垂直剖面上强反射率区的范围及伸展高度对雹云的发展有重要作用。强反射率区对应着云中含水量集中区域,只有含水量累积区位于云中过冷区中时才利于冰雹的生长;一旦回波出现55 dB z并高度达到4 km以上,降雹随即产生;强单体雹暴是一种发展非常强烈,有着特殊结构的强雷暴。上述结果对冰雹预警有重要意义。
