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

机译:平流层极涡中有关非线性过程的拉格朗日描述的简单运动学模型

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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月至2002年发生的异常平流层突然变暖事件中,南半球平流层中存在的行星波的拉格朗日足迹。我们的重点是构建一个简单的运动学模型,该模型保留了在极地涡旋破裂及其先前阶段中负责复杂流体包裹演化的基本机制。运动模型的构建以地势场的傅立叶分解为指导。在ERA-中期重新分析数据中对拉格朗日输运现象的研究突出了双曲线轨迹,这些轨迹是拉格朗日物体,是观察到的丝状现象的运动机理。我们的分析表明,在我们的模型中,由于行星波的突然增长和轴对称流的衰减,极涡的破裂和分裂是合理的。

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