Analysis on the Formation Reason of a Dusty Weather in the Midwest of Hulun Buir City

[Objective] The research aimed to analyze the formation reason of a dusty weather in the midwest of Hulun Buir City. [Method] By combining the synoptic method with the ecological environment variation, the occurrence and influence of a typical dusty weather which happened in the midwest of Hulun Buir City on May 30, 2006 were analyzed. The occurrence mechanism of dusty weather in the city was elaborated deeply, and the source of dusty weather was put forward from the ecological environment variation angle. [Result] Under the big environment background that Hulun Buir Prairie desertification increased day by day, the unusually arid climate condition in spring was the main factor that caused the dust. The serious drought and the persistent warming in the prior period of dust formation caused the loosened and dry mantle soil, the delayed turning green of pasture grass, the thickening of dry soil layer. These objective natural environments and climatic factors were the decisive elements which induced the dusty weather. The abnormal warming from the ground to the high altitude provided the thermal condition for the formation of dusty weather, and promoted the increase of atmospheric stratification instability. In addition, the existence of jet stream in the high and low altitudes played the role of momentum download on the formation of ground gale. The formation and development of ground Mongolia cyclone provided the power condition for the formation of dusty weather, and the gale was the direct element of dusty weather formation. [Conclusion] The research provided the reference comments for the prevention and control of dusty weather in the city.