The structure and evolution of the stratospheric vortex in response to natural forcings

D.M. Mitchell, L.J. Gray, A.J. Charlton-Perez

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

Abstract

The structure and evolution of the Arctic stratospheric polar vortex is assessed during opposing phases of, primarily, the El Niño–Southern Oscillation (ENSO) and the Quasi-Biennial Oscillation (QBO), but the 11 year solar cycle and winters following large volcanic eruptions are also examined. The analysis is performed by taking 2-D moments of vortex potential vorticity (PV) fields which allow the area and centroid of the vortex to be calculated throughout the ERA-40 reanalysis data set (1958–2002). Composites of these diagnostics for the different phases of the natural forcings are then considered. Statistically significant results are found regarding the structure and evolution of the vortex during, in particular, the ENSO and QBO phases. When compared with the more traditional zonal mean zonal wind diagnostic at 60°N, the moment-based diagnostics are far more robust and contain more information regarding the state of the vortex. The study details, for the first time, a comprehensive sequence of events which map the evolution of the vortex during each of the forcings throughout an extended winter period.
Original languageEnglish
JournalJournal of Geophysical Research: Atmospheres
Volume116
Issue numberD15
DOIs
Publication statusPublished - 2011

Bibliographical note

cited By 19

Fingerprint Dive into the research topics of 'The structure and evolution of the stratospheric vortex in response to natural forcings'. Together they form a unique fingerprint.

Cite this