摘要
利用ECMWF/ECR-40全球再分析资料,通过计算剩余速度,分析了剩余环流的分布特征,同时利用位势高度场资料做了行星波的谐波分析,计算了行星波1波振幅以及2波振幅。最后通过合成分析、谐波分析等方法,分析了行星波活动强弱不同时期剩余环流的变化以及波动发生转化过程中剩余环流的变化。结果表明,行星波1波、2波振幅与剩余速度三者之间有很好的相关性,2波与剩余速度的相关性要好于1波。此外,波动振幅与-v*的位相比较一致,超前于-w*大约1～2个月。当波动较强时,剩余环流也较强。当行星波由1波转化为2波后,剩余环流在平流层50 hPa以下是增强的,在30 hPa以上却是减弱的。当2波转化为1波以后,平流层30 hPa以下的剩余环流减弱,但20 hPa以上却是增强的。
Using the global ECMWF/ECR-40 reanalysis data and calculating the residual velocities, the distribution characteristic of the residual circulation are analyzed. And the planetary wave amplitudes of waves 1 and 2 were also calculated by the geopotential height data. Then the changes of the residual circulation were analyzed in different activity intensities of planetary wave, as well as the change after wave 1 transformed into wave 2 or wave 2 transformed into wave 1. The results showed that there was a nice coherence between the amplitudes of the wave 1 or the one of wave 2 and the residual velocities, the coherence between wave 2 and the residual velocities was better than that between wave 1 and the residual velocities. In addition, the phase of the wave amplitude was unanimous with that of v^-＊ , but earlier about two months than that of w^-＊. The residual circulation became more intense while the wave became more intense. After the planetary waves transformed from waves 1 to 2, the residual circulation became stronger under 50 hPa in the stratosphere, but became weaker above 30 hPa. At the same time, after the planetary wave transformed from waves 2 into 1, the residual circulation got weaker under 30 hPa, but stronger above 20 hPa in the stratosphere.
出处
《高原气象》
CSCD
北大核心
2009年第2期402-410,共9页
Plateau Meteorology
基金
中国科学院知识创新工程领域前沿项目(IAP07312)
成都信息工程学院引进人才科研启动项目(KYT200708)共同资助
关键词
平流层
剩余环流
行星波
Stratosphere
Residual circulation
Planetary wave
