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《Arid Zone Research》 2009-06
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Spatiotemporal Pattern of Precipitation in Tianshui Region and Its Response to the Indian Ocean Dipole

ZHAO Xin1, MA Jin-zhu1, NIE Zhong-qing1, WU Chun-ping2, WANG Gang3(1.Key Laboratory of West China's Environmental Systems,Lanzhou University,Lanzhou 730000,China;2.College of Environmental and Municipal Engineering,Lanzhou Jiaotong University;Lanzhou 730070,China;3.Lanzhou Meteorological Bureau,Lanzhou 730000,China)  
Based on the precipitation data from meteorological stations in Tianshui region located in the upper reaches of the Weihe River,the trend characteristics of precipitation change in resent 50 years are ananlyzed by using Mann-Kendall method and Empirical Orthogonal Function(EOF) analysis.The results show that a decrease trend in precipitation in the study area has been occurring since 1994.The results also reveal that there are three precipitation patterns in the study area,i.e.the all-consistency pattern,north-south pattern and west-east pattern.The first eigenvector is dominant in the study area,and its accumulation contribution rate is 82.2%.Moreover,there is a high correlation between the precipitation trend and the Indian Ocean DIPOLE.The delay time of positive correlation is for 7~8 months and of negative one for 2~3 months.
【Fund】: 西部交通建设科技项目(2004-318-000-57)
【CateGory Index】: P426.6
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