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    Test of the Ogura-Cho Model on a-Prefrontal Squall Line Case

    Source: Monthly Weather Review:;1975:;volume( 103 ):;issue: 009::page 764
    Author:
    Lewis, John M.
    DOI: 10.1175/1520-0493(1975)103<0764:TOTOCM>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The interaction between a squall line and its environment is examined by using the model of Ogura and Cho (1973). This model incorporates a continuous spectrum of cumulus clouds that are distinguished by their entrainment rates. Conversion of liquid water droplets into raindrops has been included in the cloud microphysical process, but the ice phase has been neglected. By virtue of the cloud spectrum, convective transport terms in the larger scale heat and moisture equations appear as functions of vertical mass flux within the clouds. Once the larger-scale distributions are determined from observations, the vertical mass flux can be found from the budget equations. The cloud populations, i.e., fractional area covered by each cloud category, and the cumulative rainfall rate are functions of this vertical mass flux. A squall line observed in the National Severe Storms Laboratory (NSSL) network on 8 June 1966 is used to test the theory. This squall line encompassed approximately 10% of the area used in the budget calculations. Observed heat and moisture distributions in the larger scale environment of the squall line are explained in terms of the cumulus processes. A comparison between the theoretically-derived cloud population and observed population was made possible by the WSR-57 radar at NSSL. Cloud population was estimated using precipitation reflectivity data from hourly tilt sequences of this 10 cm radar. The observed and theoretical distribution of clouds compared favorably on 1) the relative frequency of tall clouds, and 2) total areal coverage by clouds.
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      Test of the Ogura-Cho Model on a-Prefrontal Squall Line Case

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4199296
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    contributor authorLewis, John M.
    date accessioned2017-06-09T16:00:55Z
    date available2017-06-09T16:00:55Z
    date copyright1975/09/01
    date issued1975
    identifier issn0027-0644
    identifier otherams-58808.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4199296
    description abstractThe interaction between a squall line and its environment is examined by using the model of Ogura and Cho (1973). This model incorporates a continuous spectrum of cumulus clouds that are distinguished by their entrainment rates. Conversion of liquid water droplets into raindrops has been included in the cloud microphysical process, but the ice phase has been neglected. By virtue of the cloud spectrum, convective transport terms in the larger scale heat and moisture equations appear as functions of vertical mass flux within the clouds. Once the larger-scale distributions are determined from observations, the vertical mass flux can be found from the budget equations. The cloud populations, i.e., fractional area covered by each cloud category, and the cumulative rainfall rate are functions of this vertical mass flux. A squall line observed in the National Severe Storms Laboratory (NSSL) network on 8 June 1966 is used to test the theory. This squall line encompassed approximately 10% of the area used in the budget calculations. Observed heat and moisture distributions in the larger scale environment of the squall line are explained in terms of the cumulus processes. A comparison between the theoretically-derived cloud population and observed population was made possible by the WSR-57 radar at NSSL. Cloud population was estimated using precipitation reflectivity data from hourly tilt sequences of this 10 cm radar. The observed and theoretical distribution of clouds compared favorably on 1) the relative frequency of tall clouds, and 2) total areal coverage by clouds.
    publisherAmerican Meteorological Society
    titleTest of the Ogura-Cho Model on a-Prefrontal Squall Line Case
    typeJournal Paper
    journal volume103
    journal issue9
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1975)103<0764:TOTOCM>2.0.CO;2
    journal fristpage764
    journal lastpage778
    treeMonthly Weather Review:;1975:;volume( 103 ):;issue: 009
    contenttypeFulltext
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