Abstract:

Precipitation data of 30 meteorologic stations such as Kunming, Chuxiong, Dali, Mengzi, Malong, et al.in central Yunnan plateau from 1950s to 2010, various time scale including annual maximum 1 hours, 6 hours, 24 hours, and maximum monthly, summer, yearly, were collected.MannKendall test and Morlet wave methods were taken to research changing rules.The results show that in the whole region, annual maximum rainfall of 1 hours, 6 hours, 24 hours generally increased.Whereas, maximum monthly, summer and yearly precipitation series presented increased or decreased at those stations.But precipitation were increased and the disparity between rainy and drought season gradually shortened in traditional droughty areas of the plateau such as Binchuanxiangyun, Yuanmou, and Mengzijianshui, etc.Specially, Malong was increased at annual maximum short time rainfall while decreased at middle and long time dimension.The period of maximum rainfall series of 1 hours, 6 hours, 24 hours was 4 (or 7), 23 years, respectively.〖JP2〗In maximum monthly, summer, yearly time dimension, the period was focused on 6 and 21 years, respectively.It indicates that the unreversed trend of global climate change results in the frequency of rainstorm in central Yunnan plateau increasing gradually, and its extent spreads larger gradually.〖