【摘要】 使用NCEP/NCAR全球再分析网格点资料(2.5°×2.5°纬度/经度)和我国区域性沙尘暴过程历史资料,分析了春季大气环流特征及低空急流与甘肃河西走廊春季强沙尘暴的关系。结果表明,在东亚中纬度高空维持纬向强急流锋区的情况下,极易造成甘肃河西走廊春季强沙尘暴的低空急流产生。揭示了沙尘暴形成的大尺度环流动力影响因子的事实,指出可将产生这种低空急流特征的西风带大型环流的调整过程,作为甘肃河西走廊春季强沙尘暴天气的预警信号,而低空急流的位置及强度又可作为沙尘暴强度及沙尘暴发生和影响区的预报指标。更多还原

【Abstract】 Using the regional dust storm records in China and NCEP/NCAR reanalysis data （2.5°×2.5°lat/lon） in recent 48 years （1955\₂002）, the relations between the characteristics of atmospheric circulation and low-level jet with severe dust storm over North China in spring were analyzed. The results showed that the low-level jet of severe dust storm over Hexi Corridor of Gansu in spring was easily formed under the case of maintaining zonal jet front zone over the high-lever of the middle latitude of East Asia. The facts that the relevant dynamic and thermodynamic factors of large-scale circulation formed dust storms in Hexi Corridor of Gansu in spring was revealed, it indected that take the low-level jet with adjustment processes for large-scale circulations in westerly belt not only as the early warning signal of severe dust storm weather over Hexi Corridor of Gansu in spring, but also the location and indensity of low-level jet as the predictive index of dust storms intensity, occurrance and effect areas.更多还原