Model of oscillatory instability in vertically-homogeneous atmosphere

P. B.Rutkevich; P P.Rutkevych

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Model of oscillatory instability in vertically-homogeneous atmosphere

机译：垂直均匀大气中的振荡不稳定性模型

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Existence and repeatability of tornadoes could be straightforwardly explainedif there existed instability, responsible for their formation.However, it is well known that convection is the only instability in initiallystable air, and the usual convective instability is not applicable for these phenomena.In the present paper we describe an instability in the atmosphere, which can beresponsible for intense vortices.This instability appears in a fluid with Coriolis force and dissipation and hasoscillatory behaviour, where theamplitude growth is accompanied by oscillations with frequency comparable tothe growth rate of the instability.In the paper, both analytical analysis of the linear phase of the instabilityand nonlinear simulation of the developed stage of the air motion areaddressed.This work was supported by the RFBR grant no. 09-05-00374-a.

机译：如果存在龙卷风的不稳定因素，可以简单地解释龙卷风的存在和重复性，但是众所周知，对流是最初稳定的空气中唯一的不稳定因素，通常的对流不稳定性不适用于这些现象。我们描述了大气中的不稳定性，这可能是强烈的涡旋造成的。这种不稳定性出现在具有科里奥利力和耗散以及具有振荡特性的流体中，其中振幅的增长伴随着频率与不稳定性的增长速度相当的振荡。提出了不稳定性的线性阶段的分析分析和空气运动发展阶段的非线性模拟。 09-05-00374-a。

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《Advances in Geosciences》 |2009年第15期|共7页
作者
P. B.Rutkevich; P P.Rutkevych;
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中图分类天文学、地球科学;
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Model of oscillatory instability in vertically-homogeneous atmosphere

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