Parameterization of the inertial gravity waves and generation of the quasi-biennial oscillation
Parameterization of the inertial gravity waves and generation of the quasi-biennial oscillation
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DOI：
10.1029/2011jd016778
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发表时间：
2012-03
影响因子：
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通讯作者：
X. Xue;Han L. Liu;X. Dou
中科院分区：
文献类型：
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作者：
X. Xue;Han L. Liu;X. Dou
[1] 在这项工作中，我们扩展了当前在整个大气群落气候模型（WACCM）中使用的重力波参数化方案，该方案基于 Lindzen 的线性饱和理论，通过包含科里奥利效应来更好地描述惯性重力波（IGW）。我们进行 WACCM 模拟，通过包含 IGW 频谱来研究纬向平均纬向风的赤道振荡的产生，以及风振荡对 IGW 的参数依赖性以及新方案的效果。这些模拟表明，标准和新方案的参数化 IGW 强迫都能够使用当前模型中的标准空间分辨率设置，在平流层中产生具有向下相位级数的赤道风振荡。振荡的周期取决于 IGW 强迫的强度，并且振荡的幅度取决于波谱的宽度。新的参数化主要通过改变临界水平来影响破浪水平和加速度。通过正确选择方案参数，可以在内部生成准两年振荡（QBO）。将由此产生的风振荡特性与观测到的 QBO 进行比较。这些实验证明需要对 IGW 进行参数化，以在大气循环模型 (GCM) 中生成 QBO。
[1] In this work we extend the gravity wave parameterization scheme currently used in the Whole Atmosphere Community Climate Model (WACCM), which is based upon Lindzen's linear saturation theory, by including the Coriolis effect to better describe the inertia-gravity waves (IGW). We perform WACCM simulations to study the generation of equatorial oscillations of the zonal mean zonal winds by including a spectrum of IGWs, and the parametric dependence of the wind oscillation on the IGWs and the effect of the new scheme. These simulations demonstrate that the parameterized IGW forcing from the standard and the new scheme are both capable of generating equatorial wind oscillations with a downward phase progression in the stratosphere using the standard spatial resolution settings in the current model. The period of the oscillation is dependent on the strength of the IGW forcing, and the magnitude of the oscillation is dependent on the width of the wave spectrum. The new parameterization affects the wave breaking level and acceleration rates mainly through changing the critical level. The quasi-biennial oscillations (QBO) can be internally generated with the proper selection of the parameters of the scheme. The characteristics of the wind oscillations thus generated are compared with the observed QBO. These experiments demonstrate the need to parameterize IGWs for generating the QBO in General Circulation Models (GCMs).