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《Journal of Anhui Agricultural Sciences》 2010-23
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Evaluation of NCEP/NCAR Reanalysis Temperature,Geopotential Height and Wind Field Data in the Upper Troposphere and Lower Stratosphere by Radiosonde Data

LIU Chao et al (Nanjing University of Information Science and Technology,Nanjing,Jiangsu 210044)  
Based on sounding measurements in 160 radiosonde stations over the world,the uncertainty of geopotential heights,temperature and wind fields in the upper troposphere and lower stratosphere in the NCEP/NCAR reanalysis data were analyzed. The analysis showed that the distribution of standard error of reanalysis wind field in comparison to sounding observations is related to the westerly jet,where the reanalysis wind field has significant difference with soundings. The distribution of standard error in the wind field has significant seasonal difference in winter and summer,and the average deviation was larger along the coastline. Larger standard error of reanalysis geopotential height and temperature is mainly distributed in low-latitude regions in the Eastern Hemisphere,such as the Indian Ocean coast,and smaller standard error is found in inland regions. The distribution of standard error in temperature field has a similar distribution with the average bias,which suggests that the average bias plays an important role in the formation of standard error. The standard error of reanalysis temperature and geopotential height inland was low,high value area distribute along the coastline. The average bias of wind field is larger along the coastline,which is possibly related to the regional differences of sounding data quality and the fact that there are more observing stations in inland areas and less at sea.
【Fund】: 国家重点基础研究发展计划(2010CB428602)
【CateGory Index】: P425.3
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