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《Journal of Anhui Agricultural Sciences》 2011-07
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Study on Temporal-Spatial Features of the Date of the First Day to Spring in Chongqing

XIA Bai-cheng et al(Chongqing Climate Centre,Chongqing 401147)  
By using the daily mean temperature data in 1966-2008 from 34 stations in Chongqing,the annual dates of the first day to spring for various station in the recent 43 years were calculated,and the temporal-spatial distributions were studied using the methods of EOF、REOF、tendency analysis and wavelet analyses.The results show that spatial distributions of the dates of the first day to spring display clear differences.The consistently abnormal characteristic is the main spatial distribution mode of the dates of the first day to spring in Chongqing,and it is also the important mode that the high and the low altitude areas are reverse change feature.The dates of the first day to spring in Chongqing are divided into four spatial distribution types: the western type,the middle type,the southeastern type and the Changjiang River coastal area type.The characteristic of interannual change in every sub-area is inconsistent,and it shows two types mainly: slightly earlier trend type and parabolic curve type.In the recent 43 years,the periodic oscillations of the dates of the first day to spring are not well consistent in every distribution type.
【Fund】: 重庆市自然科学基金计划重点项目(CSTC 2008BA0022)
【CateGory Index】: S161.22
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