Influence of the basic state zonal flow on convectively coupled equatorial waves
Influence of the basic state zonal flow on convectively coupled equatorial waves
复制标题
基本态纬向流对对流耦合赤道波的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
G. Kiladis
中科院分区：
文献类型：
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作者：
J. Dias;G. Kiladis
观测数据被用来测试的假设，即基本状态调制对流耦合赤道波（CCEW）的色散特性。这一假设是基于浅水理论，该理论预测，这种对流层赤道模式的传播的纬向速度被改变的等效深度和基本的纬向流。计算局部时空谱，以研究CCEW谱峰如何在热带地区变化，以及它们如何受到地理和季节观测到的纬向风变化的影响。基本状态正压纬向气流的多普勒频移很容易识别。一旦考虑到这种多普勒频移，从全球功率谱推断的CCEW的等效深度在地理上和时间上都是惊人的均匀。然而，也有可检测的调制，出现一致的纬向流的垂直切变的变化，沿着其他变化，不容易解释。
Observational data are used to test the hypothesis that the basic state modulates the dispersion properties of convectively coupled equatorial waves (CCEWs). This hypothesis is based on shallow water theory, which predicts that the zonal speed of propagation of such tropospheric equatorial modes is altered by the equivalent depth and the basic zonal flow. Localized space‐time spectra are calculated to investigate how CCEW spectral peaks vary across the tropics and how they are affected by the variations in zonal wind observed geographically and by season. Doppler shifting by the basic state barotropic zonal flow is readily identified. Once this Doppler shifting is taken into account, the equivalent depths of CCEWs inferred from global power spectra are surprisingly uniform, both geographically and temporally. However, there are also detectable modulations that appear consistent with changes in vertical shear of the zonal flow, along with other shifts that are not as easily explained.
影响因子：
3.1
作者：
Yang G
通讯作者：
Yang G