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    The Simulation of a Convective Cloud in a 3D Model with Explicit Microphysics. Part II: Dynamical and Microphysical Aspects of Cloud Merger

    Source: Journal of the Atmospheric Sciences:;1996:;Volume( 053 ):;issue: 017::page 2525
    Author:
    Kogan, Yefim L.
    ,
    Shapiro, Alan
    DOI: 10.1175/1520-0469(1996)053<2525:TSOACC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The development and merger of pairs of convective clouds in a shear-free environment were simulated in an explicit microphysical cloud model. The occurrence or nonoccurrence of updraft merger and the timing of merger depended critically on the initial spacing of the thermal perturbations imposed in the model's initialization. In the unmerged cases the presence of a neighbor cloud was detrimental to cloud development at all times. In the merged cases this negative interaction was still operating but only until the onset of updraft merger. Based on the visual form of the updraft merger, it was hypothesized that low-level merger was a consequence of mutual advection, that is, that each cloud caught its neighbor in its radial inflow and advected it inward. This low-level advection hypothesis was quantified by considering a potential flow induced by two line sinks whose strengths were set equal to the low-level mass flux into the numerically simulated clouds. The merger times obtained from the advection hypothesis were in good agreement with the merger times observed in the simulations. Moreover, if merger did not occur, the advection hypothesis suggested that merger should not have occurred. The merger process was accompanied by the presence of trimodal drop spectra at the upper levels of the cloud. It was shown that the drop size distribution depends not only on the autoconversion and accretion rates, but also on the nonlinear interaction between various source and sink terms affecting rain formation, particularly on the rates of condensation-evaporation, sedimentation, and breakup processes. The analysis of raindrop trajectories showed the details of rain formation in different cloud regions and the effect of dynamical conditions on the growth of rain particles.
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      The Simulation of a Convective Cloud in a 3D Model with Explicit Microphysics. Part II: Dynamical and Microphysical Aspects of Cloud Merger

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4158210
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    contributor authorKogan, Yefim L.
    contributor authorShapiro, Alan
    date accessioned2017-06-09T14:34:03Z
    date available2017-06-09T14:34:03Z
    date copyright1996/09/01
    date issued1996
    identifier issn0022-4928
    identifier otherams-21828.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4158210
    description abstractThe development and merger of pairs of convective clouds in a shear-free environment were simulated in an explicit microphysical cloud model. The occurrence or nonoccurrence of updraft merger and the timing of merger depended critically on the initial spacing of the thermal perturbations imposed in the model's initialization. In the unmerged cases the presence of a neighbor cloud was detrimental to cloud development at all times. In the merged cases this negative interaction was still operating but only until the onset of updraft merger. Based on the visual form of the updraft merger, it was hypothesized that low-level merger was a consequence of mutual advection, that is, that each cloud caught its neighbor in its radial inflow and advected it inward. This low-level advection hypothesis was quantified by considering a potential flow induced by two line sinks whose strengths were set equal to the low-level mass flux into the numerically simulated clouds. The merger times obtained from the advection hypothesis were in good agreement with the merger times observed in the simulations. Moreover, if merger did not occur, the advection hypothesis suggested that merger should not have occurred. The merger process was accompanied by the presence of trimodal drop spectra at the upper levels of the cloud. It was shown that the drop size distribution depends not only on the autoconversion and accretion rates, but also on the nonlinear interaction between various source and sink terms affecting rain formation, particularly on the rates of condensation-evaporation, sedimentation, and breakup processes. The analysis of raindrop trajectories showed the details of rain formation in different cloud regions and the effect of dynamical conditions on the growth of rain particles.
    publisherAmerican Meteorological Society
    titleThe Simulation of a Convective Cloud in a 3D Model with Explicit Microphysics. Part II: Dynamical and Microphysical Aspects of Cloud Merger
    typeJournal Paper
    journal volume53
    journal issue17
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1996)053<2525:TSOACC>2.0.CO;2
    journal fristpage2525
    journal lastpage2545
    treeJournal of the Atmospheric Sciences:;1996:;Volume( 053 ):;issue: 017
    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