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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >A Minimal Model of QBO-Like Oscillation in a Stratosphere-Troposphere Coupled System under a Radiative-Moist Convective Quasi-Equilibrium State
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A Minimal Model of QBO-Like Oscillation in a Stratosphere-Troposphere Coupled System under a Radiative-Moist Convective Quasi-Equilibrium State

机译：辐射-湿对流准平衡状态下平流层-对流层耦合系统中类似QBO振荡的最小模型

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References(25) Cited-By(2) Supplementary materials(1) We re-examine the internal oscillation dynamically analogous to the equatorial quasi-biennial oscillation (QBO) that was firstly obtained by Held et al. (1993; hereafter HHR93) as a radiative-convective quasi-equilibrium state in a highly-idealized two-dimensional regional model with explicit moist convections under a periodic lateral boundary condition without Coriolis effects. A QBO-like oscillation with a period of 120.6 days is obtained for the control experiment with a similar configuration as HHR93. The QBO-like oscillation is a robust feature, not sensitive to the choice of model configuration such as domain size and horizontal resolution, or boundary conditions such as prescribed zonal wind at the top and sea surface temperature.The obtained QBO-like oscillations show downward propagation of the zonal mean signals in the stratosphere as revealed by observations and wave-mean flow interaction theories, while unlike the observed equatorial QBO, they have a clear signal in the zonal mean zonal wind and temperature in the troposphere. The zonal mean precipitation also varies in accordance with the oscillation, though its day-to-day fluctuation is very large compared to the long-period oscillation.
机译：参考文献（25）被引用的参考文献（2）补充材料（1）我们重新检查了内部振荡，该现象类似于Held等人首先获得的赤道准两年一次振荡（QBO）。 （1993;此后为HHR93）在高度理想化的二维区域模型中为辐射对流准平衡态，在周期性横向边界条件下具有明显的对流，且没有科里奥利效应。对于对照实验，获得了与HHR93类似的QBO样振荡，周期为120.6天。类QBO振荡是一种鲁棒性特征，对模型配置的选择（例如区域大小和水平分辨率）或边界条件（例如在顶部和海面温度处规定的纬向风）不敏感。观测和波均流相互作用理论揭示了平流层中纬向平均信号的传播，尽管与观测到的赤道QBO不同，它们在对流层纬向平均纬向风和温度中具有清晰的信号。纬向平均降水量也随振荡而变化，尽管与长期振荡相比，其逐日波动很大。

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