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常年冬春季节,云南高原多盛行南支西风急流的干暖大陆气团控制,天气风和日丽,晴天多、日照长、雨量稀少。北方冷空气南下,除受云南高原层层阻挡外,也受高层干暖气流阻挡,所以一般强度的冷空气不易入侵我省,更不能影响西双版纳,使冷空气多以偏东路径经贵州影响华南地区。一九八二年入冬以来,大气环流异常,发生明显调整、纬向度减弱,经向度加强,槽脊活动频繁。在脊前偏北气
In perennial winter and spring, the Yunnan Plateau prevails over the warm and humid continental air mass of the south branch of the western part of the Yunnan Plateau. The weather is sunny and sunny with more sunshine and scarce rainfall. Cold northern air south, except by the layers of the upper reaches of the block in Yunnan, but also by the high-level dry airflow blocked, so the general strength of the cold air is not easy to invade our province, but can not affect the Xishuangbanna, so that more cold air to the east by the Guizhou influence of South China area. Since the beginning of winter in 1982, the general circulation of the atmosphere has changed dramatically with obvious adjustments in latitude and weakened degrees of orientation. North in the ridge before the gas