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NCEP 和JRA 再分析资料与探空资料的位势高度比较分

田 笑智协飞徐海明   

  1. 南京信息工程大学大气科学学院,江苏 南京 210044
  • 收稿日期:2012-11-26 出版日期:2013-07-10 发布日期:2013-01-16
  • 作者简介:田笑(1989 - ),女,山西人,在读硕士研究生,主要从事大气低频振荡研究. E - mail:906098912@ qq. com

The Comparison of Geopotential Height Between NCEP and JRA Reanalysis Data and Sounding Data

TIAN Xiao,ZHI Xiefei,XU Haiming   

  1. College of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China
  • Received:2012-11-26 Online:2013-07-10 Published:2013-01-16

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

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

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