关键词: 沙尘暴, 能见度, 大风, 寒潮, 物理量诊断, 红外云图

Abstract: There were thirteen sand-dust weather processes in Shaanxi province in 2006, in which the process on April 11 was the most serious, and also the most serious in the last 10 years in Shan'xi. This sand-dust weather process induced a series of development of weather process; although it only lasted for eight to nine hours, it influenced most area, 70% to 80% of the whole province. In order to reveal the characteristics of some meteorological factors in the process of sand-dust weather and its mechanism, the numerical forecast in FY-2 satellite infrared cloud image and MICAPS2.0 model about this sand-dust weather process was analyzed in this study. The results showed that there was abnormal state in infrared cloud image: suitable match of high and low altitude position, abnormal denseness of pressure and temperature gradient and burst of gale. The results of this study can provide some theory basis for the forecast of the level and the occurrence region of sandstorm.

Key words: sandstorm, visibility, gale, cold wave, diagnosis of physical feature, infrared cloud image