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《Journal of Glaciology and Geocryology》 2006-02
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Analyses of the Climatic Characteristics in the Water Diversion Areas of the Western Route Project of South-North Water Diversion and the Upstream Areas of Yellow River

LI Zhen-chao, WEI Zhi-gang, Lü Shi-hua, WEN Li-juan, LI Suo-suo (Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China)  
Using the daily data of temperature and precipitation from 25 stations in the water diversion areas and the upstream areas of Yellow River from 1951 to 2000,the temporal and spatial characteristics of precipitation in these areas are analyzed with the EOF method.The water diversion areas and the upstream areas of Yellow River are partitioned into 7 regions using the methods of statistic test clustering analysis and REOF.The multi-temporal scale characteristics of temperature and precipitation in each region are researched through wavelet analysis.The results indicate that the annual precipitation in the water diversion areas is more than that in the upstream areas of Yellow River.The variations of precipitation in summer,autumn and winter in these two areas are consistent primarily,with a secondary variation of inverse phase.The variations of precipitation in spring in these two areas are primarily opposite,with a secondary variation of same phase.In addition,there is an opposite variation of annual precipitation in the northwest-southeast direction.The variation of temperature in each region is increasing primarily.An analysis,which passes the significant test with the confidence of 95%,shows that the period of precipitation is quasi-3 years and the oscillatory period of temperature is mainly 2~5 years and quasi-11 years.The precipitation variations in summer during these 50 years in the water diversion areas and in the upstream areas of Yellow River are basically the same,but sometimes they are obviously different.
【Fund】: 国家自然科学基金项目(40375033);; 中国科学院“百人计划”项目(2004406);; 黄河水利委员会委托项目“南水北调西线第一期工程引水区与黄河上游丰枯水年气象成因条件分析”资助
【CateGory Index】: P463.1
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