【摘要】 通过对河西走廊 1971～ 2 0 0 0年 3～ 5月大风和沙尘暴个例普查 ,运用相关法分析了河西走廊大风和沙尘暴天气在时间上的分布差异和沙尘暴与沙源地区前期降水的关系 ,同时对“起沙风”也作了初步探讨 ,结果表明 :河西走廊地区在 10min平均风速大于等于 9m/s时 ,极易起沙 ;河西走廊的西部、中部、东部分别在南疆中东部、南疆东部内蒙西部河西西部、内蒙中西部出现 5～ 8mm降水后 5天才有可能出现沙尘暴。文中给出了河西走廊大风沙尘暴的几种典型环流形势及每一种环流形势可引发沙尘暴的预报着眼点更多还原

【Abstract】 Using spring strong wind and dust storm data from 1971 and 2000 in Hexi Corridor, an analysis was made of the temporal distribution difference between spring strong wind and dust storms in Hexi Corridor by way of the correlation method, and the relation between dust storms and the precipitation over the sand-origin area at the earlier period. The “sand wind” is discussed. It is concluded that when the average wind is stronger than 9 m/s in Hexi corridor, there occur likely dust storms; and after 5 days of 5-8 mm precipitation occurring in the middle and eastern Southern Xinjiang, western Mongolia and Hexi Corridor and eastern South Xinjiang, middle and western Inner Mongolia, dust storms will likely occur in west, middle, and east parts of the corridor. Finally several types of circulation patterns of dust storms with strong wind are concluded and the index for forecasting dust storm for each pattern is presented.更多还原