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

Víctor José García-Garrido, Jezabel Curbelo, Carlos Roberto Mechoso, Ana María Mancho*, Stephen Wiggins

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
299 Downloads (Pure)

Abstract

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.

Original languageEnglish
Pages (from-to)265-278
Number of pages14
JournalNonlinear Processes in Geophysics
Volume24
Issue number2
DOIs
Publication statusPublished - 9 Jun 2017

Fingerprint

Dive into the research topics of 'A simple kinematic model for the Lagrangian description of relevant nonlinear processes in the stratospheric polar vortex'. Together they form a unique fingerprint.

Cite this