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A Comparative Analysis of Height Field Variations over the Tibetan Plateau Using ECMWF and NCEP Reanalysis Data

XUN Xue-yi1,2,3,HU Ze-yong1,SUN Jun1,3,4,CUI Gui-feng5, XU Li-jiao1,3,GU Liang-li1(1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Lanzhou 730000,China;2.Inner Mongolia Autonomous Region Meteorological Observatory,Hohhot Inner Mongolia 010051,China; 3.Graduate University of Chinese Academy of Science,Beijing 100049,China;4.Suining Weather Bureau,Suining Sichuan 629000,China;5.No.18 Middle School of Hohhot,Hohhot Inner Mongolia 010022,China)  
Comparative analysis of flow pattern and magnitude are made with NCEP/NCAR and ECMWF reanalysis datasets over 600 hPa,500 hPa and 200 hPa monthly height fields in the Tibetan Plateau.It is found that there are some similarities,but the difference is remarkable between the results derived from the two reanalysis datasets.Discrepancies of the flow pattern in the lower layer are more obvious than that in the upper layer.For the 600 hPa,the flow pattern derived from ECMWF data is basically agreed with that derived from NCEP/NCAR in winter,while in other seasons there are differences in flow pattern between the two derivations.For the 500 hPa,the flow pattern derived from ECMWF data is different with that derived from NCEP/NCAR in summer,while in other seasons they are very similar.The same situation appears in the 200 hPa height field.The decadal,annual and seasonal variations of the flow magnitude derived from the two reanalysis datasets have the same tendency.When they are compared with upper-air observation data,flow magnitude by using ECMWF data is more reliable than that by using NCEP/NCAR data in the south and centre plateau,and the flow magnitude derived from NCEP/NCAR data is the same as observation value in the north plateau.
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