Dynamical formation of an extra‐tropical tropopause inversion layer in a relatively simple general circulation model
Dynamical formation of an extra‐tropical tropopause inversion layer in a relatively simple general circulation model
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相对简单的大气环流模型中温带对流层顶逆温层的动态形成
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
L. Polvani
中科院分区：
文献类型：
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作者：
S. Son;L. Polvani
最近发现的热带外对流层顶逆温层的形成和维持的关键因素目前尚不清楚。在这项研究中，它表明，这样一个层可以形成的结果，天气尺度斜压涡的湍流动力学单独，在没有明确参数化，小尺度，辐射对流过程。一个简单的大气环流模型，初始化从静止状态，并与理想化的强迫驱动，发现自发发展的对流层顶上方的逆温层下各种各样的参数选择和模型分辨率。此外，这样的模式是能够捕获，定性地，纬度和（部分）的季节性依赖所观察到的对流层顶逆温层。然而，我们的简单模型无法捕捉到一些详细的定量特征，这强烈表明，除了平衡的天气尺度动力学之外，其他物理过程可能会发挥重要作用。
The key factors contributing to the formation and maintenance of the recently discovered extra‐tropical tropopause inversion layer are presently unclear. In this study, it is shown that such a layer can form as a consequence of the turbulent dynamics of synoptic‐scale baroclinic eddies alone, in the absence of explicitly parameterized, small‐scale, radiative‐convective processes. A simple general circulation model, initialized from a state of rest, and driven with idealized forcings, is found to spontaneously develop an inversion layer above the tropopause under a wide variety of parameter choices and model resolutions. Furthermore, such a model is able to capture, qualitatively, both the latitudinal and (in part) the seasonal dependence of the observed tropopause inversion layer. However, the inability of our simple model to capture some detailed quantitative features strongly suggests that other physical processes, beyond balanced synoptic‐scale dynamics, are likely to play an important role.