Uncovering the edge of the polar vortex

Mattia Serra, Pratik Sathe, Francisco J Beron-Vera, George Haller

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The polar vortices play a crucial role in the formation of the ozone hole and can cause severe weather anomalies. Their boundaries, known as the vortex "edges," are typically identified via methods that are either frame dependent or return nonmaterial structures and, hence, are unsuitable for assessing material transport barriers. Using two-dimensional velocity data on isentropic surfaces in the Northern Hemisphere, the authors show that elliptic Lagrangian coherent structures (LCSs) identify the correct outermost material surface dividing the coherent stratospheric vortex core from the surrounding incoherent surf zone. Despite the purely kinematic construction of LCSs, the authors find a remarkable contrast in temperature and ozone concentration across the identified vortex boundary. The authors also show that potential vorticity-based methods, despite their simplicity, misidentify the correct extent of the vortex edge.

Original languageEnglish (US)
Pages (from-to)3871-3885
Number of pages15
JournalJournal of the Atmospheric Sciences
Volume74
Issue number11
DOIs
StatePublished - Nov 1 2017

Keywords

  • Arctic
  • Atmosphere
  • Lagrangian circulation/transport
  • Nonlinear dynamics
  • Stratospheric circulation

ASJC Scopus subject areas

  • Atmospheric Science

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