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《Plateau Meteorology》 2003-06
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Comparison Study of Spatial Interpolation Methods of Air Temperature over Qinghai-Xizang Plateau

LI Xin,CHENG Guodong,LU Ling(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China)  
The spatial interpolation methods of inverse distance weight, trend surface, Kriging, Cokriging and combined method are utilized for the comparison study on spatial interpolation of January mean air temperatures from 1961 to 1990 in the QinghaiXizang Plateau (QXP). The results of the former four methods display a nearly similar spatial structure. Moreover, the center of low temperature in northwestern QXP can not be revealed due to uneven spatial distribution of meteorological stations and limited obsevations. In the combined method, monthly mean air temperature is divided into structural and stochastic components, and, with the help of Digital Elevation Model (DEM), the structural component is simulated by the lapse rate of different latitude and altitude zones in the QXP, the stochastic component is treated by the Kriging method. The results of combined method correctly represent spatial distribution of monthly mean air temperatures in the QXP. Its errors are far less than ordinary Kriging method that depends only on samples. Furthermore, the errors have been averaged, and they are evenly distributed in the study area. The comparing study of these interpolation methods on the monthly mean air temperature in the QXP indicates that the best spatial interpolation method does not exist, the best interpolation method only exist in given conditions. The best results of data interpolation can only be achieved by exploratory spatial data analysis and various experiments.The interpolation results showed that spatial distribution of monthly mean air temperatures in the QXP is controlled by altitudinal and latitudinal zonations, displaying a structure of high temperature in eastern and southern parts and low temperature in western and northern parts. The January mean air temperature in the QXP is lower than -13℃ and increases southeastward. The biggest center of low temperature is located in northwestern QXP north of 34°N and west of 93°E, with January mean air temperature lower than -16℃ and the lowest interpolated value of -25℃; another lower temperature area is in Qilian Mountains. Secondary level low temperature centers with smaller areal extent have been found in the regions around Wudaoliang, Tuotuohe and Maduo in the interior of the QXP, with January mean air temperature lower than -15℃. High temperature center of January is located in southeastern QXP, the high temperature ridge extends northward to Changdu and westward to Lhasa and Xigaza along the 29°N (Yaluzangbu River). The air temperature increases southeastward from -3℃ to 6℃.
【Fund】: 中国科学院知识创新工程重大项目(KZCX1 SW 04);; 国家自然科学基金项目(90202014)资助
【CateGory Index】: P462.5
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