A simple kinematic model for the Lagrangian description of relevant nonlinear processes in the stratospheric polar vortex
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 09, 2017
- Source ID
- 10.5194/npg-24-265-2017
Entities
People
- Ana María Mancho
- Carlos Roberto Mechoso
- Jezabel Curbelo
- Stephen Wiggins
- Víctor José García-garrido
Organizations
- Ministry of Economy, Industry and Competitiveness
- National Science Foundation
- Office of Naval Research