摘要
利用小波分析方法，分析了榆林地区1951～2010年降水量的变化趋势、周期特征及其与太阳黑子数的关系。结果表明：夏季降水量最多，冬季降水量最少；60年来降水量呈减少趋势；榆林年降水量的变化主要存在2～3、7、17和22年的周期，其中以7年周期最明显；春季降水量的主周期为5～7、16～22年；夏季降水量主要存在6～8、19年的周期；秋季降水量主要存在5～7年的周期；冬季降水量主要存在16、12年的周期。太阳黑子数的变化存在9年的周期；太阳黑子数与年降水量、春季降水量的关系较密切，与秋季、冬季降水量的关系不大。
In this paper , the method of wavelet analysis was used to study the variation trend and periodic features of precipita -tion in Yulin area of Shaanxi province during 1951~2010 , and the method of simple linear regression was used to analyze the rela-tionship between the precipitation and the number of sunspots .The results indicated that the summer precipitation was the most in a year, while the winter precipitation was minimal .The precipitation in Yulin area showed a decreasing trend in the past 60 years.The main periods of 2~3a, 7a, 17a, and 22a existed in variation in the annual precipitation of Yulin , and the 7a period was the most obvious.The main periods of spring precipitation were 5~7a and 16~22a.The main periods of summer precipitation were 6~8a and 19a.The main period of 5~7a existed in autumn precipitation .The change in winter precipitation mainly included two periods：16a and 12a.The 9a period existed in change in the number of sunspots .The number of sunspots was closely related with the annual pre-cipitation and spring precipitation , but was hardly related with the autumn precipitation and winter precipitation .
出处
《江西农业学报》
CAS
2015年第4期94-98,共5页
Acta Agriculturae Jiangxi
关键词
榆林
降水量
太阳黑子
小波分析
Yulin
Precipitation
Sunspot
Wavelet analysis
