摘要
在Lorenz环流分解基础上,比较了全球平流层低层ECMWF和NCEP/NCAR两种再分析资料月平均温度场的差异。结果表明:(1)纬向的平均温度无论DJF季度还是JJA季度100 hPa,30°S^30°N纬带都是冷中心;在该冷纬带ECMWF资料温度均值显著低于NCEP资料,ECWMF资料的年际方差显著小于NCEP资料。(2)30 hPa以上NCEP资料的定常波比较杂乱,在中纬大陆上出现与事实不符的高低中心,而ECMWF资料反映的气温定常波则比较合理。(3)ECMWF资料在100 hPa和10 hPa上气温异常未能充分地反映近50 a来3次强的火山喷发引起的平流层增温。
The ECMWF and NCEP reanalysis data are compared of monthly mean temperatures in lower stratosphere using Lorenz circulation decomposition. The results are given as follow：in DJF and JJA,the zonal mean temperature of 30°S -30°N is a cold band at 100 hPa. In this area,the climatological temperature normals of ECMWF reanalysis are lower than those of NCEP reanalysis significantly, and the interannual variances of ECMWF reanalysis are smaller than the ones of NCEP reanalysis. Several high and low centers in midlatitudes reveal some shortcomings in NCEP temperature stationary waves. But the thermal anomaly of NCEP reanalysis is superior to ECMWF reanalysis,because ECMWF reanalysis fails to capture the marked warming in stratosphere（ 100 hPa and 10 hPa） after three strong volcanic eruptions.
出处
《南京气象学院学报》
CSCD
北大核心
2008年第3期429-435,共7页
Journal of Nanjing Institute of Meteorology
基金
江苏省气象灾害重点实验室资助项目(KLME060211)
国家自然科学基金委托项目
