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    The Impact of the Time Step on the Intensity of ITCZ in an Aquaplanet GCM

    Source: Monthly Weather Review:;2008:;volume( 136 ):;issue: 011::page 4077
    Author:
    Mishra, Saroj K.
    ,
    Srinivasan, J.
    ,
    Nanjundiah, Ravi S.
    DOI: 10.1175/2008MWR2478.1
    Publisher: American Meteorological Society
    Abstract: Several numerical experiments have been conducted using the NCAR Community Atmosphere Model, version 3 (CAM3) to examine the impact of the time step on rainfall in the intertropical convergence zone (ITCZ) in an aquaplanet. When the model time step was increased from 5 to 60 min the rainfall in the ITCZ decreased substantially. The impact of the time step on the ITCZ rainfall was assessed for a fixed spatial resolution (T63 with L26) for the semi-Lagrangian dynamical core (SLD). The increase in ITCZ rainfall at higher temporal resolution was primarily a result of the increase in large-scale precipitation. This increase in rainfall was caused by the positive feedback between surface evaporation, latent heating, and surface wind speed. Similar results were obtained when the semi-Lagrangian dynamical core was replaced by the Eulerian dynamical core. When the surface evaporation was specified, changes in rainfall were largely insensitive to temporal resolution. The impact of temporal resolution on rainfall was more sensitive to the latitudinal gradient of SST than to the magnitude of SST.
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      The Impact of the Time Step on the Intensity of ITCZ in an Aquaplanet GCM

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4209369
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    contributor authorMishra, Saroj K.
    contributor authorSrinivasan, J.
    contributor authorNanjundiah, Ravi S.
    date accessioned2017-06-09T16:26:19Z
    date available2017-06-09T16:26:19Z
    date copyright2008/11/01
    date issued2008
    identifier issn0027-0644
    identifier otherams-67874.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209369
    description abstractSeveral numerical experiments have been conducted using the NCAR Community Atmosphere Model, version 3 (CAM3) to examine the impact of the time step on rainfall in the intertropical convergence zone (ITCZ) in an aquaplanet. When the model time step was increased from 5 to 60 min the rainfall in the ITCZ decreased substantially. The impact of the time step on the ITCZ rainfall was assessed for a fixed spatial resolution (T63 with L26) for the semi-Lagrangian dynamical core (SLD). The increase in ITCZ rainfall at higher temporal resolution was primarily a result of the increase in large-scale precipitation. This increase in rainfall was caused by the positive feedback between surface evaporation, latent heating, and surface wind speed. Similar results were obtained when the semi-Lagrangian dynamical core was replaced by the Eulerian dynamical core. When the surface evaporation was specified, changes in rainfall were largely insensitive to temporal resolution. The impact of temporal resolution on rainfall was more sensitive to the latitudinal gradient of SST than to the magnitude of SST.
    publisherAmerican Meteorological Society
    titleThe Impact of the Time Step on the Intensity of ITCZ in an Aquaplanet GCM
    typeJournal Paper
    journal volume136
    journal issue11
    journal titleMonthly Weather Review
    identifier doi10.1175/2008MWR2478.1
    journal fristpage4077
    journal lastpage4091
    treeMonthly Weather Review:;2008:;volume( 136 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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