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Simulation of the equatorial quasi-biennial oscillation based on the parameterization of continuously spectral gravity waves

机译：基于连续谱重力波参数化的赤道准两年一次振荡模拟

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摘要

On the basis of previous parameterization schemes, considering both the wave breaking and absorbed at critical level, a parameterization with a continuous spectrum of gravity waves is realized by introducing a momentum flux density function for thewave spectrum, and then the parameterization scheme of the gravity waves is improved. Choosing parameter values of the background atmosphere and waves based on the observations, a more realistic equatorial quasi-biennial oscillation (QBO) driven by the incorporated drag from the planetary and gravity waves can be simulated. The numerical results indicate that the forcing magnitude of the planetary and gravity waves varies with the wind field, and in some phases of the QBO, the contribution of the gravity waves is comparable with that of the planetary waves. After the QBO is steadily formed, its amplitude and period and wind configuration are relevant to the effect of vertical diffusion and the momentum flux distribution with spectrum, however, independent of the initial background wind field. Moreover, for any given nonzero initial background wind, a steady QBO can be finally generated due to the incorporated drag from the planetary and gravity waves.
机译：在先前的参数化方案的基础上，考虑到临界点处的碎波和吸收，通过引入波谱的动量通量密度函数来实现具有连续重力谱的参数化，然后对重力波进行参数化得到改善。根据观察结果选择背景大气和波浪的参数值，可以模拟由行星波和重力波引入的阻力驱动的更为逼真的赤道准两年一次振荡（QBO）。数值结果表明，行星和重力波的强迫大小随风场而变化，并且在QBO的某些阶段，重力波的贡献与行星波的作用相当。 QBO稳定形成后，其振幅和周期以及风的构造与垂直扩散和动量通量的频谱分布有关，但是与初始背景风场无关。此外，对于任何给定的非零初始背景风，由于来自行星波和重力波的阻力，最终可以产生稳定的QBO。

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