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    Poleward-Propagating Intraseasonal Monsoon Disturbances in an Intermediate-Complexity Axisymmetric Model

    Source: Journal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 002::page 470
    Author:
    Bellon, Gilles
    ,
    Sobel, Adam
    DOI: 10.1175/2007JAS2339.1
    Publisher: American Meteorological Society
    Abstract: A model of intermediate complexity based on quasi-equilibrium theory?a version of the quasi-equilibrium tropical circulation model with a prognostic atmospheric boundary layer, as well as two free-tropospheric modes in momentum, and one each in moisture and temperature?is used in a zonally symmetric aquaplanet configuration to simulate aspects of the South Asian monsoon and its variability. Key qualitative features of both the mean state and the 30?60-day mode of the intraseasonal variability are simulated satisfactorily. The model has two limit cycles of similar period and structure that can account for this mode. Both feature northward propagation of the tropical convergence zone from 5°S to 25°N with a period of about 50 days. The dynamics of the oscillations are investigated. The system reaches a Hopf bifurcation when the asymmetry of the sea surface temperature (SST) forcing is increased. Beyond the bifurcation, the mean flow is linearly unstable, and the one linearly unstable mode is similar in structure and period to the nonlinear mode. The wind-induced surface heat fluxes are necessary to obtain the instability of the mean monsoon flow, as are the 2 degrees of freedom in the vertical structure of both humidity and wind.
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      Poleward-Propagating Intraseasonal Monsoon Disturbances in an Intermediate-Complexity Axisymmetric Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4206736
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    contributor authorBellon, Gilles
    contributor authorSobel, Adam
    date accessioned2017-06-09T16:18:40Z
    date available2017-06-09T16:18:40Z
    date copyright2008/02/01
    date issued2008
    identifier issn0022-4928
    identifier otherams-65503.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206736
    description abstractA model of intermediate complexity based on quasi-equilibrium theory?a version of the quasi-equilibrium tropical circulation model with a prognostic atmospheric boundary layer, as well as two free-tropospheric modes in momentum, and one each in moisture and temperature?is used in a zonally symmetric aquaplanet configuration to simulate aspects of the South Asian monsoon and its variability. Key qualitative features of both the mean state and the 30?60-day mode of the intraseasonal variability are simulated satisfactorily. The model has two limit cycles of similar period and structure that can account for this mode. Both feature northward propagation of the tropical convergence zone from 5°S to 25°N with a period of about 50 days. The dynamics of the oscillations are investigated. The system reaches a Hopf bifurcation when the asymmetry of the sea surface temperature (SST) forcing is increased. Beyond the bifurcation, the mean flow is linearly unstable, and the one linearly unstable mode is similar in structure and period to the nonlinear mode. The wind-induced surface heat fluxes are necessary to obtain the instability of the mean monsoon flow, as are the 2 degrees of freedom in the vertical structure of both humidity and wind.
    publisherAmerican Meteorological Society
    titlePoleward-Propagating Intraseasonal Monsoon Disturbances in an Intermediate-Complexity Axisymmetric Model
    typeJournal Paper
    journal volume65
    journal issue2
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2007JAS2339.1
    journal fristpage470
    journal lastpage489
    treeJournal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 002
    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