The effect of tropospheric jet latitude on coupling between the stratospheric polar vortex and the troposphere

Chaim I. Garfinkel, Darryn W. Waugh, Edwin Gerber

Research output: Contribution to journalArticle

Abstract

A dry general circulation model is used to investigate how coupling between the stratospheric polar vortex and the extratropical tropospheric circulation depends on the latitude of the tropospheric jet. The tropospheric response to an identical stratospheric vortex configuration is shown to be strongest for a jet centered near 408 and weaker for jets near either 30° or 50° by more than a factor of 3. Stratosphere-focused mechanisms based on stratospheric potential vorticity inversion, eddy phase speed, and planetary wave reflection, as well as arguments based on tropospheric eddy heat flux and zonal length scale, appear to be incapable of explaining the differences in the magnitude of the jet shift. In contrast, arguments based purely on tropospheric variability involving the strength of eddy-zonal mean flow feedbacks and jet persistence, and related changes in the synoptic eddy momentum flux, appear to explain this effect. The dependence of coupling between the stratospheric polar vortex and the troposphere on tropospheric jet latitude found here is consistent with 1) the observed variability in the North Atlantic and the North Pacific and 2) the trend in the Southern Hemisphere as projected by comprehensive models.

Original languageEnglish (US)
Pages (from-to)2077-2095
Number of pages19
JournalJournal of Climate
Volume26
Issue number6
DOIs
StatePublished - 2013

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polar vortex
troposphere
eddy
wave reflection
planetary wave
potential vorticity
heat flux
Southern Hemisphere
stratosphere
vortex
effect
general circulation model
momentum
persistence

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

The effect of tropospheric jet latitude on coupling between the stratospheric polar vortex and the troposphere. / Garfinkel, Chaim I.; Waugh, Darryn W.; Gerber, Edwin.

In: Journal of Climate, Vol. 26, No. 6, 2013, p. 2077-2095.

Research output: Contribution to journalArticle

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