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    Zonal jets as transport barriers in planetary atmospheres

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    2008jas2579%2E1.pdf (830.3Kb)
    Date
    2008-10
    Author
    Beron-Vera, F. J.  Concept link
    Brown, Michael G.  Concept link
    Olascoaga, M. J.  Concept link
    Rypina, Irina I.  Concept link
    Kocak, Huseyin  Concept link
    Udovydchenkov, Ilya A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4025
    As published
    https://doi.org/10.1175/2008JAS2579.1
    DOI
    10.1175/2008JAS2579.1
    Keyword
     Jets; Planetary atmospheres; Potential vorticity; Stratosphere; Vorticity 
    Abstract
    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.
    Description
    Author Posting. © American Meteorological Society, 2008. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of the Atmospheric Sciences 65 (2008): 3316–3326, doi:10.1175/2008JAS2579.1.
    Collections
    • Physical Oceanography (PO)
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Atmospheric Sciences 65 (2008): 3316–3326
     

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