玉树地区1961-2015年降水变化特征分析

为了了解玉树地区近55年来降水的变化特征和规律，利用玉树地区近55年降水量资料，分析了玉树地区降水量年代际、年际、各季和各月的气候变化特征，并用小波变换方法分析了年、季降水量的周期变化。结果表明，年降水量呈增加趋势，气候倾向率为4.641 mm/10 a，55年来，共增加了25.5 mm。夏季降水量呈减少趋势，而春、秋、冬三季降水量呈增加趋势；各月降水量减少最多的是7月，其次是8月；各月降水量增加最多的是5月，其次是6月。年、春、夏以及冬季降水量的主周期是26年左右，秋季降水量的主周期为12年左右。

Precipitation Variation Characteristics in Yushu in 1961-2015

The paper aims to understand change characteristics and regularity of precipitation in the yushu area in recent 55 years, the climate change characteristics of decade , annual , seasonal and monthly precipitation in Yushu Area are analyzed based on the observed data of precipitation in the city in 1961-2015 years; the periods of annual, seasonal precipitation in Yushu Area are analyzed using the wavelet transform. The results showed that the precipitation decreased with a tendency of 4.641mm per ten years, the increased rainfall was about 25.5mm The summer precipitation showed a trend of decrease, spring, autumn, winter and the precipitation increased; The decreasing tendency is the most significant in July, followed by August, The increasing tendency is the most significant in May, followed by June. The year, spring, summer and winter precipitation had a main periodicity of 26 years, autumn precipitation had a main periodicity of 12 years.