Spectral Analysis of Tropical Atmospheric Dynamical Variables Using a Linear Shallow-Water Modal Decomposition
Spectral Analysis of Tropical Atmospheric Dynamical Variables Using a Linear Shallow-Water Modal Decomposition
复制标题
使用线性浅水模态分解对热带大气动力变量进行频谱分析
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Kleeman
中科院分区：
文献类型：
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作者：
M. Gehne;R. Kleeman
时空谱分析在研究对流耦合赤道波的观测证据方面得到了广泛的应用。本文通过对β面线性浅水方程经向基函数的适当投影，分析了23年亮温Tb资料和动力再分析资料。给出了TB、纬向风、经向风、散度和位势谱中沿赤道模线性频散曲线的功率峰值的证据。所考虑的所有时空谱的另一个特征是频率、纬向波数和经向模数的红度。结果表明，动力变化谱中的谱峰与线性浅水波基本一致，但与正压波和温带风暴路径活动有关的谱峰也很明显。对流耦合波信号被限制在最初的几个子午基函数中，建议了一种滤波方法来降低这些信号的噪声。这个.。
AbstractSpace–time spectral analysis has been used frequently in studying observational evidence of convectively coupled equatorial waves. Here 23 yr of brightness temperature Tb data and dynamical reanalysis data are analyzed by an appropriate projection onto the meridional basis functions of the β-plane linear shallow-water equations. Evidence of peaks in power along linear equatorial mode dispersion curves in Tb, zonal and meridional wind, divergence, and geopotential spectra are presented.Another feature of all space–time spectra considered is the redness in frequency, zonal wavenumber, and meridional mode number. It is found that spectral peaks in the dynamical variable spectra are largely consistent with linear shallow-water waves, but peaks related to barotropic waves and extratropical storm track activity are also apparent. The convectively coupled wave signals are seen to be confined to the first few meridional basis functions, suggesting a filtering method to reduce noise for these signals. This...
影响因子：
3.1
作者：
Yang G
通讯作者：
Yang G
影响因子：
3.1
作者：
Yang G
通讯作者：
Yang G