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首页> 外文期刊>Journal of the Atmospheric Sciences >Constraints on wave drag parameterization schemes for simulating the quasi-biennial oscillation. Part I: Gravity wave forcing
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Constraints on wave drag parameterization schemes for simulating the quasi-biennial oscillation. Part I: Gravity wave forcing

机译：波浪阻力参数化方案的约束，用于模拟准每两年一次的振荡。第一部分：重力波强迫

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摘要

Parameterization schemes for the drag due to atmospheric gravity waves are discussed and compared in the context of a simple one-dimensional model of the quasi-biennial oscillation (QBO). A number of fundamental issues are examined in detail, with the goal of providing a better understanding of the mechanism by which gravity wave drag can produce an equatorial zonal wind oscillation. The gravity wave-driven QBOs are compared with those obtained from a parameterization of equatorial planetary waves. In all gravity wave cases, it is seen that the inclusion of vertical diffusion is crucial for the descent of the shear zones and the development of the QBO. An important difference between the schemes for the two types of waves is that in the case of equatorial planetary waves, vertical diffusion is needed only at the lowest levels, while for the gravity wave drag schemes it must be included at all levels. The question of whether there is downward propagation of influence in the simulated QBOs is addressed. In the gravity wave drag schemes, the evolution of the wind at a given level depends on the wind above, as well as on the wind below. This is in contrast to the parameterization for the equatorial planetary waves in which there is downward propagation of phase only. The stability of a zero-wind initial state is examined, and it is determined that a small perturbation to such a state will amplify with time to the extent that a zonal wind oscillation is permitted.
机译：在准两年度振荡（QBO）的简单一维模型的背景下，讨论并比较了由于大气重力波引起的阻力的参数化方案。详细研究了许多基本问题，目的是更好地理解重力波拖曳产生赤道纬向风振荡的机理。将重力波驱动的QBO与从赤道行星波参数化获得的QBO进行比较。在所有重力波情况下，可以看出，垂直扩散的加入对于剪切带的下降和QBO的发展至关重要。两种类型的波浪方案之间的重要区别在于，在赤道行星波的情况下，仅在最低水平需要垂直扩散，而对于重力波阻力方案，必须在所有水平都包括垂直扩散。解决了在模拟的QBO中是否存在影响向下传播的问题。在重力波阻力方案中，给定水平的风的演变取决于上方的风以及下方的风。这与赤道行星波的参数化相反，在赤道系行星波中，相位仅向下传播。检查零风初始状态的稳定性，并且确定对这种状态的小扰动将随时间放大到允许区域风振动的程度。

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