鄂尔多斯市一次沙尘暴天气过程分析及GRAPES_MESO模式检验

Analysis of a Sandstorm Weather Process and GRAPES_MESO Model Test in Ordos City

文章利用气象高空、地面数据资料和GRAPES_MESO中尺度模式,对2022年3月13日发生在鄂尔多斯的一次沙尘天气过程进行分析。结果表明:此次沙尘天气的主要原因是蒙古气旋的强烈发展以及冷锋过境所引起的,在动力因子和热力因子的共同作用下,使得蒙古气旋发展东移,加之前期气候干燥,降水少,气温明显回升,近地层干燥,地表植被覆盖率低,裸露地表较多,为沙尘天气的发生提供丰富的沙源条件。GRAPES_MESO中尺度模式对此次沙尘天气形势预报偏北,但对大风的开始时间和落区预报表现较好。

Using meteorological high altitude and ground data and GRAPES_MESO mesoscale model to analyze a dust weather process in Ordos on March 13,2022.The results show that the main cause of the sand and dust weather is the strong development of Mongolian cyclone and the transit of cold front.Under the joint action of dynamic factors and thermal factors,the development of Mongolian cyclone moves eastward.In addition,the climate in the early stage is dry,the precipitation is less,the temperature rises significantly,the near ground layer is dry,the surface vegetation coverage is low,and the exposed surface is more,which provides rich sand source conditions for the occurrence of sand and dust weather.GRAPES_MESO mesoscale model predicts the dust weather situation in the north,but the forcast of the start time and falling area of strong wind is better.