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    Linking Hadley Circulation and Storm Tracks in a Conceptual Model of the Atmospheric Energy Balance

    Source: Journal of the Atmospheric Sciences:;2018:;volume 075:;issue 003::page 841
    Author:
    Mbengue, Cheikh
    ,
    Schneider, Tapio
    DOI: 10.1175/JAS-D-17-0098.1
    Publisher: American Meteorological Society
    Abstract: AbstractMidlatitude storm tracks shift in response to climate change and natural climate variations such as El Niño, but the dynamical mechanisms controlling these shifts are not well established. This paper develops an energy balance model that shows how shifts of the Hadley cell terminus and changes of the meridional energy flux out of the Hadley cell can drive shifts of storm tracks, identified as extrema of the atmospheric meridional eddy energy flux. The distance between the Hadley cell terminus and the storm tracks is primarily controlled by the energy flux out of the Hadley cell. Because tropical forcings alone can modify the Hadley cell terminus, they can also shift extratropical storm tracks, as demonstrated through simulations with an idealized GCM. Additionally, a strengthening of the meridional temperature gradient at the terminus and hence of the energy flux out of the Hadley cell can reduce the distance between the Hadley cell terminus and the storm tracks, enabling storm-track shifts that do not parallel shifts of the Hadley cell terminus. Thus, with the aid of the energy balance model and supporting GCM simulations, a closed theory of storm-track shifts emerges.
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      Linking Hadley Circulation and Storm Tracks in a Conceptual Model of the Atmospheric Energy Balance

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4261725
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    contributor authorMbengue, Cheikh
    contributor authorSchneider, Tapio
    date accessioned2019-09-19T10:07:06Z
    date available2019-09-19T10:07:06Z
    date copyright1/15/2018 12:00:00 AM
    date issued2018
    identifier otherjas-d-17-0098.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261725
    description abstractAbstractMidlatitude storm tracks shift in response to climate change and natural climate variations such as El Niño, but the dynamical mechanisms controlling these shifts are not well established. This paper develops an energy balance model that shows how shifts of the Hadley cell terminus and changes of the meridional energy flux out of the Hadley cell can drive shifts of storm tracks, identified as extrema of the atmospheric meridional eddy energy flux. The distance between the Hadley cell terminus and the storm tracks is primarily controlled by the energy flux out of the Hadley cell. Because tropical forcings alone can modify the Hadley cell terminus, they can also shift extratropical storm tracks, as demonstrated through simulations with an idealized GCM. Additionally, a strengthening of the meridional temperature gradient at the terminus and hence of the energy flux out of the Hadley cell can reduce the distance between the Hadley cell terminus and the storm tracks, enabling storm-track shifts that do not parallel shifts of the Hadley cell terminus. Thus, with the aid of the energy balance model and supporting GCM simulations, a closed theory of storm-track shifts emerges.
    publisherAmerican Meteorological Society
    titleLinking Hadley Circulation and Storm Tracks in a Conceptual Model of the Atmospheric Energy Balance
    typeJournal Paper
    journal volume75
    journal issue3
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-17-0098.1
    journal fristpage841
    journal lastpage856
    treeJournal of the Atmospheric Sciences:;2018:;volume 075:;issue 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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