关键词: 干旱, 气候变化, 全球变暖, 雾日, 雪日, 云南

Abstract:

Some features of the climate change and response of extreme strong rainfall events and droughts to global climate warming over Yunnan Province have been analyzed by using temperature and rainfall data. The regional climate changing trend also has been explored respectively in the areas of Shangri- la, Xishuangbanna and Kunming. The results shows Yunnan temperature changing trend in recent 50 years behaved nearly in paralleling with the global, Northern Hemisphere and China, Yunnan temperature changing range is slightly more than the global and a little less than the Northern Hemisphere and China. The average temperature over Yunnan Province has been increasing since the late 1980s and has become most obviously warmed since the 1990s, and 13 warm winters have occurred since 1986. The number of frost days in winter and spring has gradually decreased in many areas over Yunnan. With the climate warming in recent years, the number of snow days in Shangri- la and fog days in Xishuangbanna has been decreased most obviously and the number of rain days also has decreased gradually, the change of heavy rain occurrence frequency was not obviously, but rainstorm appeared frequently, the occurrence frequency of heat wave and drought events increased. Upon entering the 21st century, the changing trend of rainfall over Yunnan has been reduced, the number of heat wave and drought events has been changed frequently and increased, and the occurrence frequency interval changed from 2- 3 years to 1- 2 years. The spring and summer continuous drought in 2005 and spring drought in 2006 were respectively most severe drought events over Yunnan Province in recent 50 and 20 years.

Key words: climate change, drought, fog days, global warming, snow days, Yunnan