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首页> 外文期刊>Journal of the Atmospheric Sciences >The Roles of Equatorial Trapped Waves and Internal Inertia-Gravity Waves in Driving the Quasi-Biennial Oscillation. Part II: Three-Dimensional Distribution of Wave Forcing
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The Roles of Equatorial Trapped Waves and Internal Inertia-Gravity Waves in Driving the Quasi-Biennial Oscillation. Part II: Three-Dimensional Distribution of Wave Forcing

机译：赤道陷波和内部惯性重力波在驱动准两年一次振荡中的作用。第二部分：波浪强迫的三维分布

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摘要

Three-dimensional wave forcing of simulated quasi-biennial oscillation (QBO) is investigated using a high-resolution atmospheric general circulation model with T213L256 resolution (60-km horizontal and 300-m vertical resolution). In both the eastward and westward wind shear phases of the QBO, nearly all Eliassen-Palm flux (EP flux) divergence due to internal inertia gravity waves (defined as fluctuations with zonal wavenumber >= 12) results from the divergence of the vertical component of the flux. On the other hand, EP flux divergence due to equatorial trapped waves (EQWs) results from both the meridional and vertical components of the flux in regions of strong vertical wind shear. Longitudinal dependence of wave forcing is also investigated by three-dimensional wave activity flux applicable to gravity waves. Near the top of the Walker circulation, strong eastward (westward) wave forcing occurs in the Eastern (Western) Hemisphere due to internal inertia gravity waves with small horizontal phase speed. In the eastward wind shear zone associated with the QBO, the eastward wave forcing due to internal inertia gravity waves in the Eastern Hemisphere is much larger than that in the Western Hemisphere, whereas in the westward wind shear zone, westward wave forcing does not vary much in the zonal direction. Zonal variation of wave forcing in the stratosphere results from (i) zonal variation of wave sources, (ii) the vertically sheared zonal winds associated with the Walker circulation, and (iii) the phase of the QBO.
机译：使用高分辨率大气普通循环模型（分辨率为T213L256，水平分辨率为60 km，垂直分辨率为300 m），研究了模拟的准双年度振荡（QBO）的三维波强迫。在QBO的向东和向西风切变阶段，由于内惯性引力波（定义为纬向波数> = 12的波动）而引起的几乎所有Eliassen-Palm通量（EP通量）发散都是由垂直向分量的发散引起的。通量。另一方面，由于赤道陷波（EQW）导致的EP通量发散是由强垂直风切变区域中通量的子午分量和垂直分量引起的。还通过适用于重力波的三维波活动通量研究了波强迫的纵向相关性。在沃克环流的顶部附近，由于内惯性重力波具有较小的水平相速度，因此在东（西）半球发生了强烈的东（西）向强迫。在与QBO相关的东风切变带中，东半球内部惯性引力波引起的向东强迫比西半球大，而在西风切变带中，西向强迫没有太大的变化。在纬向。平流层中强迫波的带状变化是由于（i）波源的带状变化，（ii）与沃克环流有关的垂直剪切带状风和（iii）QBO的相位。

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