Zonal jets as transport barriers in planetary atmospheres

F. J. Beron-Vera, M. G. Brown, M. J. Olascoaga, I. I. Rypina, H. Koçak, I. A. Udovydchenkov

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


The connection between transport barriers and potential vorticity (PV) barriers in PV-conserving flows is investigated with a focus on zonal jets in planetary atmospheres. A perturbed PV staircase model is used to illustrate important concepts. This flow consists of a sequence of narrow eastward and broad westward zonal jets with a staircase PV structure; the PV steps are at the latitudes of the cores of the eastward jets. Numerically simulated solutions to the quasigeostrophic PV conservation equation in a perturbed PV staircase flow are presented. These simulations reveal that both eastward and westward zonal jets serve as robust meridional transport barriers. The surprise is that westward jets, across which the background PV gradient vanishes, serve as robust transport barriers. A theoretical explanation of the underlying barrier mechanism is provided. It is argued that transport barriers near the cores of westward zonal jets, across which the background PV gradient is small, are found in Jupiter's midlatitude weather layer and in the earth's summer hemisphere subtropical stratosphere.

Original languageEnglish (US)
Pages (from-to)3316-3326
Number of pages11
JournalJournal of the Atmospheric Sciences
Issue number10
StatePublished - 2008

ASJC Scopus subject areas

  • Atmospheric Science


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