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    The Route to Raindrop Formation in a Shallow Cumulus Cloud Simulated by a Lagrangian Cloud Model

    Source: Journal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 007::page 2125
    Author:
    Hoffmann, Fabian
    ,
    Noh, Yign
    ,
    Raasch, Siegfried
    DOI: 10.1175/JAS-D-16-0220.1
    Publisher: American Meteorological Society
    Abstract: he mechanism of raindrop formation in a shallow cumulus cloud is investigated using a Lagrangian cloud model (LCM). The analysis is focused on how and under which conditions a cloud droplet grows to a raindrop by tracking the history of individual Lagrangian droplets. It is found that the rapid collisional growth, leading to raindrop formation, is triggered when single droplets with a radius of 20?m appear in the region near the cloud top, characterized by a large liquid water content, strong turbulence, large mean droplet size, a broad droplet size distribution (DSD), and high supersaturations. Raindrop formation easily occurs when turbulence-induced collision enhancement (TICE) is considered, with or without any extra broadening of the DSD by another mechanism (such as entrainment and mixing). In contrast, when TICE is not considered, raindrop formation is severely delayed if no other broadening mechanism is active. The reason leading to the difference is clarified by the additional analysis of idealized box-simulations of the collisional growth process for different DSDs in varied turbulent environments. It is found that TICE does not accelerate the timing of the raindrop formation for individual droplets, but it enhances the collisional growth rate significantly afterwards by providing a greater number of large droplets for collision. Higher droplet concentrations increase the time for raindrop formation, decrease precipitation, but intensify the effect of TICE.
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      The Route to Raindrop Formation in a Shallow Cumulus Cloud Simulated by a Lagrangian Cloud Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4220193
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    contributor authorHoffmann, Fabian
    contributor authorNoh, Yign
    contributor authorRaasch, Siegfried
    date accessioned2017-06-09T16:59:49Z
    date available2017-06-09T16:59:49Z
    date issued2017
    identifier issn0022-4928
    identifier otherams-77615.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220193
    description abstracthe mechanism of raindrop formation in a shallow cumulus cloud is investigated using a Lagrangian cloud model (LCM). The analysis is focused on how and under which conditions a cloud droplet grows to a raindrop by tracking the history of individual Lagrangian droplets. It is found that the rapid collisional growth, leading to raindrop formation, is triggered when single droplets with a radius of 20?m appear in the region near the cloud top, characterized by a large liquid water content, strong turbulence, large mean droplet size, a broad droplet size distribution (DSD), and high supersaturations. Raindrop formation easily occurs when turbulence-induced collision enhancement (TICE) is considered, with or without any extra broadening of the DSD by another mechanism (such as entrainment and mixing). In contrast, when TICE is not considered, raindrop formation is severely delayed if no other broadening mechanism is active. The reason leading to the difference is clarified by the additional analysis of idealized box-simulations of the collisional growth process for different DSDs in varied turbulent environments. It is found that TICE does not accelerate the timing of the raindrop formation for individual droplets, but it enhances the collisional growth rate significantly afterwards by providing a greater number of large droplets for collision. Higher droplet concentrations increase the time for raindrop formation, decrease precipitation, but intensify the effect of TICE.
    publisherAmerican Meteorological Society
    titleThe Route to Raindrop Formation in a Shallow Cumulus Cloud Simulated by a Lagrangian Cloud Model
    typeJournal Paper
    journal volume074
    journal issue007
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-16-0220.1
    journal fristpage2125
    journal lastpage2142
    treeJournal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 007
    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
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