| Analysis of abnormal characteristics of summer precipitation in Qinghai during the last 45 years |
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| DOI：10.7606/j.issn.1000-7601.2008.02.43 |
| Key Words: summer precipitation abnormal characteristic rotated empirical orthogonal function long-term trend wavelet analysis Qinghai Province |
| Author Name | Affiliation | | WANG Lijun | Meteorological Bureau of Qinghai Province,Xi’ning,Qinghai 810001,China | | LIU Caihong | Meteorological Bureau of Qinghai Province,Xi’ning,Qinghai 810001,China；Institute of Atmospherics Chinese Academy of Sciences，Beijing 100029，China；Nanjing University of Information Science，Nanjing，Jiangsu 210044，China | | SUN Anping | Meteorological Bureau of Qinghai Province,Xi’ning,Qinghai 810001,China | | FU Yang | Meteorological Bureau of Qinghai Province,Xi’ning,Qinghai 810001,China | | ZHU Xide | Meteorological Bureau of Qinghai Province,Xi’ning,Qinghai 810001,China |
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| Abstract: |
| With REOF,Morlet wavelet,spectral analysis method,the spatial anomaly features and time evolution rule of summer precipitation anomaly in Qinghai are studied by using the precipitation data in June,July and August for the period 1960～2005 from 41 observation stations.The results show that the first three rotated loading vector fields represent three principal precipitation anomaly areas: East,West,and South of Qinghai.Summer precipitation tendency of every division presents unchangeableness,increasing and decreasing respectively in the last 45 years.Morlet wavelet analysis indicates that there are different oscillation periods besides 4a and 10～12 a periods in every regions.The abrupt change occurred in about 1970 and 1999. |
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