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A simple kinematic model for the Lagrangian description of relevant nonlinear processes in the stratospheric polar vortex

机译:一种简单的动态模型,用于拉格朗日的地流层极性涡旋中的相关非线性过程的描述

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In this work, we study the Lagrangian footprint of the planetary waves present in the Southern Hemisphere stratosphere during the exceptional sudden Stratospheric warming event that took place during September 2002. Our focus is on constructing a simple kinematic model that retains the fundamental mechanisms responsible for complex fluid parcel evolution, during the polar vortex breakdown and its previous stages. The construction of the kinematic model is guided by the Fourier decomposition of the geopotential field. The study of Lagrangian transport phenomena in the ERA-Interim reanalysis data highlights hyperbolic trajectories, and these trajectories are Lagrangian objects that are the kinematic mechanism for the observed filamentation phenomena. Our analysis shows that the breaking and splitting of the polar vortex is justified in our model by the sudden growth of a planetary wave and the decay of the axisymmetric flow.
机译:在这项工作中,我们研究了在2002年9月在南半球平流层中存在的行星波浪的拉格朗日足迹。我们的重点是构建一个简单的运动模型,保留了对复杂的基本机制的基本机制 在极地涡流分解期间和之前的阶段的流体包裹演变。 运动模型的构造是由地球态场的傅里叶分解引导的。 在ERA-Instim Reanalysis数据中的拉格朗日传输现象研究突出了双曲线轨迹,这些轨迹是拉格朗日对象,是观察到的细丝现象的运动机制。 我们的分析表明,通过行星波的突然生长和轴对称流动的衰变,在我们的模型中,极地漩涡的断裂和分裂是合理的。

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