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    The Dependence of ITCZ Structure on Model Resolution and Dynamical Core in Aquaplanet Simulations

    Source: Journal of Climate:;2013:;volume( 027 ):;issue: 006::page 2375
    Author:
    Landu, Kiranmayi
    ,
    Leung, L. Ruby
    ,
    Hagos, Samson
    ,
    Vinoj, V.
    ,
    Rauscher, Sara A.
    ,
    Ringler, Todd
    ,
    Taylor, Mark
    DOI: 10.1175/JCLI-D-13-00269.1
    Publisher: American Meteorological Society
    Abstract: quaplanet simulations using the Community Atmosphere Model, version 4 (CAM4), with the Model for Prediction Across Scales?Atmosphere (MPAS-A) and High-Order Method Modeling Environment (HOMME) dynamical cores and using zonally symmetric sea surface temperature (SST) structure are studied to understand the dependence of the intertropical convergence zone (ITCZ) structure on resolution and dynamical core. While all resolutions in HOMME and the low-resolution MPAS-A simulations give a single equatorial peak in zonal mean precipitation, the high-resolution MPAS-A simulations give a double ITCZ with precipitation peaking around 2°?3° on either side of the equator. This study reveals that the structure of ITCZ is dependent on the feedbacks between convection and large-scale circulation. It is shown that the difference in specific humidity between HOMME and MPAS-A can lead to different latitudinal distributions of the convective available potential energy (CAPE) by influencing latent heat release by clouds and the upper-tropospheric temperature. With lower specific humidity, the high-resolution MPAS-A simulation has CAPE increasing away from the equator that enhances convection away from the equator and, through a positive feedback on the circulation, results in a double ITCZ structure. In addition, it is shown that the dominance of antisymmetric waves in the model is not enough to cause double ITCZ, and the lateral extent of equatorial waves does not play an important role in determining the width of the ITCZ but rather the latter may influence the former.
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      The Dependence of ITCZ Structure on Model Resolution and Dynamical Core in Aquaplanet Simulations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4222922
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    contributor authorLandu, Kiranmayi
    contributor authorLeung, L. Ruby
    contributor authorHagos, Samson
    contributor authorVinoj, V.
    contributor authorRauscher, Sara A.
    contributor authorRingler, Todd
    contributor authorTaylor, Mark
    date accessioned2017-06-09T17:08:39Z
    date available2017-06-09T17:08:39Z
    date copyright2014/03/01
    date issued2013
    identifier issn0894-8755
    identifier otherams-80071.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222922
    description abstractquaplanet simulations using the Community Atmosphere Model, version 4 (CAM4), with the Model for Prediction Across Scales?Atmosphere (MPAS-A) and High-Order Method Modeling Environment (HOMME) dynamical cores and using zonally symmetric sea surface temperature (SST) structure are studied to understand the dependence of the intertropical convergence zone (ITCZ) structure on resolution and dynamical core. While all resolutions in HOMME and the low-resolution MPAS-A simulations give a single equatorial peak in zonal mean precipitation, the high-resolution MPAS-A simulations give a double ITCZ with precipitation peaking around 2°?3° on either side of the equator. This study reveals that the structure of ITCZ is dependent on the feedbacks between convection and large-scale circulation. It is shown that the difference in specific humidity between HOMME and MPAS-A can lead to different latitudinal distributions of the convective available potential energy (CAPE) by influencing latent heat release by clouds and the upper-tropospheric temperature. With lower specific humidity, the high-resolution MPAS-A simulation has CAPE increasing away from the equator that enhances convection away from the equator and, through a positive feedback on the circulation, results in a double ITCZ structure. In addition, it is shown that the dominance of antisymmetric waves in the model is not enough to cause double ITCZ, and the lateral extent of equatorial waves does not play an important role in determining the width of the ITCZ but rather the latter may influence the former.
    publisherAmerican Meteorological Society
    titleThe Dependence of ITCZ Structure on Model Resolution and Dynamical Core in Aquaplanet Simulations
    typeJournal Paper
    journal volume27
    journal issue6
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-13-00269.1
    journal fristpage2375
    journal lastpage2385
    treeJournal of Climate:;2013:;volume( 027 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian