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首页> 外文期刊>Journal of the Atmospheric Sciences >Inferences about QBO dynamics from the atmospheric 'tape recorder' effect
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Inferences about QBO dynamics from the atmospheric 'tape recorder' effect

机译：大气“磁带记录器”效应对QBO动力学的推论

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Observations of ascending water vapor anomalies in the tropical lower stratosphere-the so-called tape recorder effect-have been used to infer profiles of vertical mean motion, vertical constituent diffusivity, and lateral in-mixing rate in this region. The magnitude of vertical wave flux required to drive the quasi-biennial oscillation (QBO) in the presence of mean upwelling, along with other related aspects of QBO dynamics, is examined in light of the rape recorder results using a simple one-dimensional model. As found in a previous study, it is necessary that wave fluxes significantly exceed the "classic" values associated with long period Kelvin and Rossby-gravity waves; the extra fluxes are presumably associated with a continuous spectrum of short-period gravity and inertia-gravity waves. Larger wave fluxes, when used in connection with traditional wave-transport parameterizations developed for the QBO, require a larger vertical diffusivity of momentum in order to prevent the formation of unrealistically strong vertical wind shear. The profile of constituent diffusivity derived from the tape recorder effect, however, is much smaller everywhere than the momentum diffusivity assumed in previous QBO modeling studies. Realistic shear is obtained in the model using a momentum-conserving "shear adjustment" scheme representing the effect of unresolved shear instabilities and other processes not included in the wave-transport parameterization. This device, together with a QBO amplitude profile based on the equatorial-wave phase speeds, motivates an (otherwise inviscid) analytic QBO solution in the underdamped, quasi-compressible case. The simple analytic solutions replicate most aspects of the numerical solution, display a similar dependence on wave flux at the lower boundary, and provide reasonably accurate estimates of QBO period in the inviscid Limit. [References: 42]
机译：在热带低平流层中上升的水汽异常现象的观测（所谓的录音机效应）已被用于推断该区域的垂直平均运动，垂直成分扩散率和横向混合速率的分布。根据油菜记录仪的结果，使用简单的一维模型检查了在存在平均上升流的情况下驱动准双年度振荡（QBO）所需的垂直波通量的大小，以及QBO动力学的其他相关方面。如先前的研究中所发现，波通量必须大大超过与长期开尔文和罗斯比重力波有关的“经典”值;多余的通量大概与短周期重力波和惯性重力波的连续频谱有关。当与为QBO开发的传统波传输参数化结合使用时，较大的通量需要较大的动量垂直扩散率，以防止形成不切实际的垂直风切变。但是，从磁带录音机效应中得出的成分扩散率分布图在各处都比以前的QBO建模研究中假设的动量扩散率小得多。在模型中，使用动量守恒的“剪切调整”方案获得了实际的剪切力，该方案表示未解决的剪切不稳定性的影响以及波传输参数化中未包括的其他过程。该设备与基于赤道波相位速度的QBO振幅曲线一起，在欠阻尼，准可压缩的情况下激发了一个（否则为无粘性的）解析QBO解决方案。简单的解析解可复制数值解的大多数方面，在下边界处显示对波通量的相似依赖性，并在无粘性限值内提供合理准确的QBO周期估计。 [参考：42]

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