关键词: 云南, 连阴雨, 时空分布, 强度

Abstract:

Based on the data of daily precipitation and sunshine duration from May to October during 1981-2010 from 125 meteorological stations in Yunnan Province, the spatial-temporal distribution and intensity changes of continuous rain were analyzed in this paper. The results show that the frequency of continuous rain weather had a step-by-step increasing trend from northeast to southwest of Yunnan. If the line connected to Lijiang, Eryuan, Jingdong,Yuanjiang, Gejiu and Maguan stations was taken as a boundary, the eastern region had less continuous rain weather, while the western one was the areas of more continuous rain in Yunnan. And the frequency of continuous rain presented a reducing trend in the past 30 years, and severe continuous rain decreased obviously. The frequency of continuous rain in July was the maximum, accounting for 24.4% of the amount of rainy season. And the one in October was the minimum, only accounting for 8.2%. The general and severe continuous rain processes occurred more in Yunnan as a whole. The longer the continuous rain processes lasted, the easier they occurred in west Yunnan or in the edge of southern Yunnan. And June was the high-incidence period of severe continuous rain processes.

Key words:  Yunnan, continuous rain, spatial and temporal distribution, strength