灾害学2012，Vol.27Issue(2)：43-48,6.
云南极端霜冻气候事件的气候特征及环流背景分析
Climatic Characteristics of the Extreme Frostbite Climate Events over Yunnan and Analysis on Its Circulation Background
摘要
Abstract
Using the daily minimum temperature and frost data (1961 -2008) at 124 stations of Yunnan Province, the rate of the station numbers of minimum temperature lower than - 5 ? and the total station numbers of Yunnan are calculated. The extreme frostbite climate events over Yunnan are defined by the rate beyond 25%. At the same time, the climatic characteristics and the circulation features are analyzed. The results indicate that before the extreme frostbite climate events over Yunnan taking place, the temperature is lower and the cloud is more. When the extreme frostbite climate events take place, the clear-sky radiance cooling at night is very strong, the temperature decreases again. This frostbite belongs to mixture frostbite or advection radiance frostbite. The clear-sky radiance cooling at night controlled by the upper level cold advection and lower level cold high is one of main causes for the extreme frostbite climate events over Yunnan. When the extreme frostbite climate events take place, the air humidity is lower than that before. The air is relatively dry.关键词
极端霜冻气候事件/环流背景/低温/晴空辐射Key words
the extreme frostbite climate events/circulation background/low temperature/clear-sky radiance分类
天文与地球科学引用本文复制引用
陶云,段旭,任菊章,何群..云南极端霜冻气候事件的气候特征及环流背景分析[J].灾害学,2012,27(2):43-48,6.基金项目
中国气象局气候变化专项项目(CCSF-09-4) （CCSF-09-4）
云南省自然科学基金重点项目(2009CC002) （2009CC002）
