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
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
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发表时间：
2006
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通讯作者：
Huang Gang
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作者：
Huang Gang
利用中国、ERA-40和NCAR-NCEP再分析的探空资料，比较了中国北部(特别是内蒙古和中国北部)对流层下部和对流层上部的位势高和温度的特征。结果表明，在70年代以前，NCEP-NCAR再分析的对流层下部和对流层上部的位势高度和温度与观测结果不太吻合，现有的年代际变化趋势是不现实的，但ERA-40资料在长期趋势上与观测结果更接近。但在70年代以后，ERA-40再分析的对流层下部和对流层下部和对流层上部的温度和位势高度与观测结果有较好的一致性。NCEP-NCAR再分析得到的对流层高层位势高度和温度要好于ERA-40再分析，ERA-40再分析更接近观测值，也就是说，这两种再分析在中国北部有各自的不足。
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.