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    Improvement and Implementation of a Parameterization for Shallow Cumulus in the Global Climate Model ECHAM5-HAM

    Source: Journal of the Atmospheric Sciences:;2011:;Volume( 068 ):;issue: 003::page 515
    Author:
    Isotta, Francesco A.
    ,
    Spichtinger, P.
    ,
    Lohmann, U.
    ,
    von Salzen, K.
    DOI: 10.1175/2010JAS3447.1
    Publisher: American Meteorological Society
    Abstract: A transient shallow-convection scheme is implemented into the general circulation model ECHAM5 and the coupled aerosol model HAM, developed at the Max Planck Institute for Meteorology in Hamburg. The shallow-convection scheme is extended to take the ice phase into account. In addition, a detailed double-moment microphysics approach has been added. In this approach, the freezing processes and precipitation formation are dependent on aerosols. Furthermore, in the scheme, tracers are transported and scavenged consistently as in the rest of the model. Results of a single-column model simulation for the Barbados Oceanography and Meteorology Experiment (BOMEX) campaign are compared with previously published large-eddy simulation (LES) results. Compared to the standard version, the global ECHAM5-HAM simulations with the newly implemented scheme show a decreased frequency of shallow convection in better agreement with LES. Less shallow convection is compensated by more stratus and stratocumulus. Deep and especially midlevel convection are markedly affected by those changes, which in turn influence high-level clouds. Generally, a better agreement with the observations can be obtained. For a better understanding of the scheme?s impact and to test different setting parameters, sensitivity analyses are performed. The mixing properties, cloud-base vertical velocity, and launching layer of the test parcel, respectively, are varied. In this context, results from simulations without shallow convection are also presented.
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      Improvement and Implementation of a Parameterization for Shallow Cumulus in the Global Climate Model ECHAM5-HAM

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4212009
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    contributor authorIsotta, Francesco A.
    contributor authorSpichtinger, P.
    contributor authorLohmann, U.
    contributor authorvon Salzen, K.
    date accessioned2017-06-09T16:34:29Z
    date available2017-06-09T16:34:29Z
    date copyright2011/03/01
    date issued2011
    identifier issn0022-4928
    identifier otherams-70249.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212009
    description abstractA transient shallow-convection scheme is implemented into the general circulation model ECHAM5 and the coupled aerosol model HAM, developed at the Max Planck Institute for Meteorology in Hamburg. The shallow-convection scheme is extended to take the ice phase into account. In addition, a detailed double-moment microphysics approach has been added. In this approach, the freezing processes and precipitation formation are dependent on aerosols. Furthermore, in the scheme, tracers are transported and scavenged consistently as in the rest of the model. Results of a single-column model simulation for the Barbados Oceanography and Meteorology Experiment (BOMEX) campaign are compared with previously published large-eddy simulation (LES) results. Compared to the standard version, the global ECHAM5-HAM simulations with the newly implemented scheme show a decreased frequency of shallow convection in better agreement with LES. Less shallow convection is compensated by more stratus and stratocumulus. Deep and especially midlevel convection are markedly affected by those changes, which in turn influence high-level clouds. Generally, a better agreement with the observations can be obtained. For a better understanding of the scheme?s impact and to test different setting parameters, sensitivity analyses are performed. The mixing properties, cloud-base vertical velocity, and launching layer of the test parcel, respectively, are varied. In this context, results from simulations without shallow convection are also presented.
    publisherAmerican Meteorological Society
    titleImprovement and Implementation of a Parameterization for Shallow Cumulus in the Global Climate Model ECHAM5-HAM
    typeJournal Paper
    journal volume68
    journal issue3
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2010JAS3447.1
    journal fristpage515
    journal lastpage532
    treeJournal of the Atmospheric Sciences:;2011:;Volume( 068 ):;issue: 003
    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