| 摘要 |
Based on the high-altitude and ground observation data, as well as physical quantity field data, a cold wave weather process in Northeast China, North China and Inner Mongolia during January 1-6, 2010 was comprehensively analyzed from the aspects of circulation background, circulation situation, influence system, dynamic conditions, water vapor conditions, etc. The results show that the cold wave weather process appeared during the transition of circulation pattern from zonal to meridional type in middle and high latitudes in the northern Hemisphere. Due to the development of the European trough, the strong warm advection was transported to the Ural Ridge, making it strongly developed. The strong northerly wind belt in front of the ridge moved southwards. The warm advection at the rear of the transverse trough and the cold advection in the southeast in front of the transverse trough on the northwest side of Lake Baikal caused the transverse trough to turn upright and moved southwards, and the longitude of the circulation increased continuously to guide cold air to move southwards, resulting in this strong cold air process. The large ground pressure gradient caused by strong cold air and the frontogenesis of strong surface cyclone led to the gale in North China. |
