Abstract:

Based on China sounding data of assigned height layer in the monthly data set and NCEP and JRA reanalysis data，the tendencies，differences and correlation of geopotential height fields on the level of 850 hPa，500 hPa，100 hPa were compared in this paper．Results show that from the aspect of the geopotential height tendency，sounding data can be objectively reflected by reanalysis data on the level of 850 hPa，500 hPa，while the geopotential height tendency of reanalysis data was significantly higher than that of sounding data on the level of 100 hPa． As for the differences of the geopotential height，there was little differences on the level of 850 hPa and 500 hPa between the reanalysis data and sounding data，but on the level of 100 hPa，the differences increased obviously． The correlation between reanalysis data and sounding data was well on the level of 500 hPa，but there was obvious difference between reanalysis data and sounding data on the level of 850 hPa and 100 hPa，especially on 100 hPa． In comparison with sounding data，the tendency，difference and correlation of potential height from NCEP reanalysis data had higher reliability than that from JRA reanalysis data，and similarly higher reliability can also be obtained through the reanalysis data in eastern regions and the low latitude regions．

Key words: reanalysis data, sounding data, tendency, correlation

摘要：

利用中国高空规定层月值数据集中的探空资料和ＮＣＥＰ，ＪＲＡ 再分析资料，对８５０ ｈＰａ、５００ｈＰａ、１００ ｈＰａ 上的位势高度趋势、位势高度差值和相关程度进行了比较。结果表明：从位势高度的趋势上来看，在８５０ ｈＰａ、５００ ｈＰａ 上再分析资料能客观反映探空资料的位势高度趋势，而在１００ ｈＰａ 上再分析资料的趋势明显偏高；从位势高度的差值来看，在８５０ ｈＰａ 和５００ ｈＰａ 上再分析资料与探空资料差异较小，而在１００ ｈＰａ 上差异明显增大；从相关性看，在５００ ｈＰａ 上，再分析资料与探空资料的相关性较好，而８５０ ｈＰａ，１００ ｈＰａ 再分析资料与探空资料存在显著差异，尤其是１００ ｈＰａ；从不同的再分析资料看，与探空资料比较，ＮＣＥＰ 资料的位势高度趋势、位势高度差值和位势高度相关度比ＪＲＡ 资料具有更高的可信度，而且东部地区和低纬再分析资料的可信度较高。

关键词: 再分析资料, 探空资料, 趋势, 相关