The Assessment and Difference of the Interdecadal Variations of Climate Change in Northern Part of China with the NCEP/NCAR and ERA-40 Reanalysis Data
NCEP/NCAR和ERA-40再分析资料以及探空观测资料分析中国北方地区年代际气候变化

Based on the sounding datasets over the eastern part of China,ERA-40 and NCAR-NCEP reanalyses,we compare the characteristics of the geopotential highs and temperatures at lower and upper troposphere over northern part of China(particularly in Nei Mongol and North China).It is found that before 1970s,the geopotential heights and temperatures at lower and upper troposphere from NCEP-NCAR reanalyses do not agree well with the observations,the existing interdecadal trend is unrealistic,but the ERA-40 datasets are much closer to those of observations in the long-term trend.However,after the 1970s,the upper troposphere geopotential heights and temperatures from NCEP-NCAR reanalyses is better than ERA-40 reanalyses,which is more closer to those of observations.In other words,these two reanalyses have their own shortcoming over the northern part of China.