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Reliability of NCEP/NCAR Reanalysis Data in Climatic Change along Qinghai-Xizang Railway

WEI Li,\ LI Dong\|liang(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China)\ \  
The reliability of NCEP/NCAR reanalysis data in the climate change of Qinghai\|Xizang railway line has been investigated by comparing with the observation data from 8 surface meteorological stations. The results show that the annual variation of surface air temperature and precipitation are very well presented through NCEP/NCAR reanalyzed data. The interannual variations of the air temperature at surface are quite well given from NCEP/NCAR reanalysis data. The reanalyzed temperature is more confidence than the reanalyzed precipitation. The results are better in summer than in winter and better in major part of Qinghai\|Xizang railway line than at the two ends of the line. The trends of the surface air temperature analyzed by NCEP/NCAR, however, are completely different with those observed at the surface stations. The trends of the precipitation analyzed by NCEP/NCAR have been showed somehow comparable with the observation. It should be reminded that the NCEP/NCAR reanalyzed temperature values are systematically lower than the observation, but precipitation values higher than the observation.
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