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    A Numerical Investigation of Tropical Island Thunderstorms

    Source: Monthly Weather Review:;1993:;volume( 121 ):;issue: 005::page 1417
    Author:
    Golding, B. W.
    DOI: 10.1175/1520-0493(1993)121<1417:ANIOTI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A version of the United Kingdom Meteorological Office mesoscale weather prediction model is used to simulate cases of deep tropical convection from the Island Thunderstorm Experiment off the north coast of Australia. Selected cases contrast rather isolated storm development in a dry basic state, with widespread precipitation from a moist basic state. Excellent agreement is found between the simulations and the observed early shower development on both occasions. Initiation of convection occurs along the sea-breeze front, which is then reinforced by downdraft outflows. Merging of simulated cells occurs where the outflows meet, producing cells with cloud tops above 18 km and updraft speeds of 60 m s?1. The later movement of the storms is less well represented, probably due to weakness in the storm-mean flow interaction. Comparison of the cases shows that differences in the timing of initiation and intensity of subsequent convection are well captured, and relate to differences in the initial sounding. Mean budgets of heat, moisture, and momentum are presented, and sensitivity of the simulations to resolution, island shape, and model microphysics is explored.
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      A Numerical Investigation of Tropical Island Thunderstorms

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4203054
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    contributor authorGolding, B. W.
    date accessioned2017-06-09T16:09:21Z
    date available2017-06-09T16:09:21Z
    date copyright1993/05/01
    date issued1993
    identifier issn0027-0644
    identifier otherams-62190.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4203054
    description abstractA version of the United Kingdom Meteorological Office mesoscale weather prediction model is used to simulate cases of deep tropical convection from the Island Thunderstorm Experiment off the north coast of Australia. Selected cases contrast rather isolated storm development in a dry basic state, with widespread precipitation from a moist basic state. Excellent agreement is found between the simulations and the observed early shower development on both occasions. Initiation of convection occurs along the sea-breeze front, which is then reinforced by downdraft outflows. Merging of simulated cells occurs where the outflows meet, producing cells with cloud tops above 18 km and updraft speeds of 60 m s?1. The later movement of the storms is less well represented, probably due to weakness in the storm-mean flow interaction. Comparison of the cases shows that differences in the timing of initiation and intensity of subsequent convection are well captured, and relate to differences in the initial sounding. Mean budgets of heat, moisture, and momentum are presented, and sensitivity of the simulations to resolution, island shape, and model microphysics is explored.
    publisherAmerican Meteorological Society
    titleA Numerical Investigation of Tropical Island Thunderstorms
    typeJournal Paper
    journal volume121
    journal issue5
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1993)121<1417:ANIOTI>2.0.CO;2
    journal fristpage1417
    journal lastpage1433
    treeMonthly Weather Review:;1993:;volume( 121 ):;issue: 005
    contenttypeFulltext
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