中国1月探空资料与NCEP再分析资料位势高度场之间差异特征分析

Analysis of the geopotential height different characteristics between the air sounding and the NCEP reanalysis datasets of January in China

文章选取了NCEP再分析资料与中国探空资料150~925hPa共7个高度层,1958—2009年中每年冬季1月份的月平均高度场数据,对中国地区逐层资料进行了差值分析,并对400hPa与700hPa的差值做了时间折线分析,分析了各个层面不同区域NCEP资料的可信度以及400、700hPa层面NCEP再分析资料与探空资料之间差值随年份的变化特征。结果显示:中国地区东部资料比西部资料可信度高,低纬度资料比高纬度资料可信度高,400hPa及500hPa两层资料的偏差最小,NCEP再分析资料在400、700hPa层面都表现出了其准确性随着模式完善逐年增加的结论。

We use NCEP reanalysis data and Chinese air sounding data from 1958 to 2009,which have 7 height layers in total from 150 hPa to 925 hPa,to calculate monthly average height field in January.We analyze the layer-by-layer differences between these two datasets in China and time variation of the differences in 400 hPa and 700 hPa respectively.Furthermore,the confidence of NCEP data on different layers and diverse areas are exclusively analyzed.The results show that data in east of China are more convincing than in the west,while data in the low latitude are more receivable than in high latitude.Moreover,the differences between these two datasets are least in 400 hPa and 500 hPa and the precision rate of NCEP reanalysis data was increasing with time in 400 hPa and 700 hPa.