昆明准止步锋与云贵气象文档J(国外英文资料).docVIP

昆明准静止锋与云贵天气文档J(国外英文资料) Kunming quasi Genesis can be divided into two categories: 1, the cold front weakened into a quasi stationary front The winter cold air invasion of the southwest region, most from the Arctic Ocean, the Barents Sea and Kara lake, a small part from South Iceland ocean. This kind of deep cold air generally accumulated in northern Siberia and Mongolia first, and made the continental cold high pressure strengthen. As the westerly belt moves more strongly eastward, it often causes the lower continental pressure to burst, leading to the eruption of cold air into the south. Effect of cold air in the southwest of the main path is from Siberia to Xinjiang; because of the barrier of the Tibetan Plateau, along the flow around the plateau, Hexi Corridor, over Qinling Mountains, South into Sichuan basin, and then along the Shandong side on the cold climb to the northeast of the Yunnan plateau and Guizhou plateau. Due to a series of Yunnan Guizhou Plateau Mountain barrier layers, cold air will gradually stop, from the front into a quasi stationary front, this is the famous Kunming quasi stationary front. (Figure 1) It must be explained that the sources and attributes of the warm air on the front. In winter, planetary wind southward, subtropical high center south to north latitude 15 degrees to 20 degrees, also South westerly. Due to the blocking of the Qinghai Tibet Plateau, the westerly winds are divided into two branches. The North Branch of the west culture through northwest China, North China, northeast and East China to the Pacific; the South Branch of the westerly flow along the southern margin of the plateau from the East, the Arabia Peninsula, Iran, Pakistan, India and other places in the northern tropical desert, inland advection to Yunnan. The Taurus Mountains, the Caucasus mountains and the Iran plateau from the West formed from Europe and Central Asia over a strong barrier to cold air to the East, the South Branch airflow being very dry and warm,