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    Plume Fluxes in Clear and Cloudy Convective Boundary Layers

    Source: Journal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 015::page 1746
    Author:
    Schumann, Ulrich
    ,
    Moeng, Chin-Hoh
    DOI: 10.1175/1520-0469(1991)048<1746:PFICAC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: From results Of large-eddy simulations of the clear convective boundary layer and of a stratus-topped boundary layer, mean properties of ?plumes? that consist of ?updrafts? and ?downdrafts? are determined. The plumes are defined locally by the sign of the vertical velocity or of moisture fluctuation or by a combination of both. As a further alternative, updraft and downdrafts in which the vertical velocity magnitude exceeds certain threshold values are considered. The first two variants divide the motion field into two streams, whereas in the other variants ?environmental? air forms a separate stream. The computed mean properties are in general agreement with existing measurements. From the results we compute mean vertical fluxes assuming ?top-hat profiles? and compare these with the actual fluxes. It is shown that the most uniform flux approximation is obtained if the plume structure is classified in terms of vertical velocity w. For such ?w plumes,? the top-hat profiles approximate about 60% of the actual fluxes if updrafts and downdrafts are distinguished with zero threshold values just according to the sign of the vertical velocity. A higher percentage is obtained with nonzero threshold values.
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      Plume Fluxes in Clear and Cloudy Convective Boundary Layers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156819
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    contributor authorSchumann, Ulrich
    contributor authorMoeng, Chin-Hoh
    date accessioned2017-06-09T14:30:28Z
    date available2017-06-09T14:30:28Z
    date copyright1991/08/01
    date issued1991
    identifier issn0022-4928
    identifier otherams-20576.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156819
    description abstractFrom results Of large-eddy simulations of the clear convective boundary layer and of a stratus-topped boundary layer, mean properties of ?plumes? that consist of ?updrafts? and ?downdrafts? are determined. The plumes are defined locally by the sign of the vertical velocity or of moisture fluctuation or by a combination of both. As a further alternative, updraft and downdrafts in which the vertical velocity magnitude exceeds certain threshold values are considered. The first two variants divide the motion field into two streams, whereas in the other variants ?environmental? air forms a separate stream. The computed mean properties are in general agreement with existing measurements. From the results we compute mean vertical fluxes assuming ?top-hat profiles? and compare these with the actual fluxes. It is shown that the most uniform flux approximation is obtained if the plume structure is classified in terms of vertical velocity w. For such ?w plumes,? the top-hat profiles approximate about 60% of the actual fluxes if updrafts and downdrafts are distinguished with zero threshold values just according to the sign of the vertical velocity. A higher percentage is obtained with nonzero threshold values.
    publisherAmerican Meteorological Society
    titlePlume Fluxes in Clear and Cloudy Convective Boundary Layers
    typeJournal Paper
    journal volume48
    journal issue15
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1991)048<1746:PFICAC>2.0.CO;2
    journal fristpage1746
    journal lastpage1757
    treeJournal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 015
    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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