摘要
本文利用GRAPES模式对2006年4月9日-11日大范围强沙尘暴过程进行了热力动力数值模拟分析，结果表明：整个强沙尘暴天气发生过程中，大气基本上呈稳定层结。西路第一阶段强沙尘暴天气爆发时高值位温下凹区明显下传，西路第二阶段强沙尘暴主要爆发在等位温线密集陡峭的弱稳定层结区域里，其次在高值位温下凹东移区。西北路强沙尘暴爆发时等位温线密集陡峭。暖平流是产生西路第一阶段强沙尘暴的重要热力因子。700hPa冷平流对西北路强沙尘暴的贡献最大，冷平流在河西走廊的骤增对预报西北路强沙尘暴爆发有很好的指示意义。
Using GRAPES model, a Strong Sandstorm Weather Process which occurred in Apr 9 - 11 2006 is thermodynamic and dynamical Simulated and Analyzed. The results show that： In the whole weather process, atmospheric stratification is basically stable. In the first stage of west path, during the strong sandstorm outbreaking the high value zone of potential temperature downloads obviously. In the second stage, strong sandstorm occurs in the weak stable stratification area with dense isoline of potential temperature and the area in which high value zone of potential temperature downloads and eastward moves. In northwest path, the isoline of potential temperature is dense and steep. Warm advection is important thermodynamic factor of west path sandstorm. The contribution of cold advection over 700hPa is the biggest factor and it＇ s abrupt increase is a important index for northwest path sandstorm.
出处
《山西气象》
2008年第2期1-3,9,共4页
Shanxi Meteorological Quarterly
