【摘要】 使用NCEP再分析资料以及高空、地面观测资料和张掖C INRAD-CC天气雷达观测数据对2008年6月13日发生在河西走廊中部的一次强沙尘暴天气进行了连续监测和分析。结果表明:高空冷空气快速东移叠加到地面热低压之上形成对流不稳定,使得中尺度对流系统快速发展;T-LnP图上500~540 hPa干暖盖有利于对流层低层不稳定能量的存储和积累,干暖盖是强对流天气发生的重要征兆;沙尘暴发生前对流系统先从低层发展,然后迅速向中层发展;沙尘暴发生后中低层雷达回波减弱;中层回波开始增强,并向下发展,降水增大后,沙尘暴减弱消失;沙尘暴发生在紧邻强回波前面弱回波区域内;地面观测沙尘暴发生、发展、消亡时间与逆风区生消演变密切相关,沙尘天气发生在逆风区范围内,强沙尘暴天气发生在逆风区外层风速大值区的强辐合上升气流中。更多还原

【Abstract】 By using the reanalysis data of NCEP(1°×1°) and the radiosonde and surface observations as well as the Doppler radar products,the features of a strong dust storm occurred on 13 June 2008 in the Hexi Corridor are analyzed.Results show that the upper cold air moved fast and overlapped on the surface cyclone resulted in meso-scale convection system developing fast.The dry-warm lid at the level of 500-540 hPa was advantageous to the instability energy accumulation at low level and it was important omen for the strong convection weather.The convection system took place first at the low layer before the sandstorm outbreak,then quickly developed to middle layer.The sandstorm occurred in the weak echo area which was in front of the strong echo and in the adverse wind region of radial velocity.更多还原