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    The Structure of the Near-Neutral Atmospheric Surface Layer

    Source: Journal of the Atmospheric Sciences:;2004:;Volume( 061 ):;issue: 006::page 699
    Author:
    Drobinski, Philippe
    ,
    Carlotti, Pierre
    ,
    Newsom, Rob K.
    ,
    Banta, Robert M.
    ,
    Foster, Ralph C.
    ,
    Redelsperger, Jean-Luc
    DOI: 10.1175/1520-0469(2004)061<0699:TSOTNA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Recent observational data (turbulence variables by sonic anemometers and three-dimensional flow pattern by Doppler lidar), obtained during the Cooperative Atmosphere Surface Exchange Study field campaign in October 1999 (CASES-99), show evidence of a layered structure of the near-neutral surface layer: (i) the eddy surface layer (ESL), which is the lower sublayer where blocking of impinging eddies is the dominating mechanism; and (ii) the shear surface layer (SSL), which is an intermediate sublayer, where shear affects the isotropy of turbulence. The origin of the eddies impinging from aloft (probably from the SSL) down to the ESL is preliminarily addressed in this study, since the Doppler lidar data show evidence of linearly organized eddies embedded in the surface layer (i.e., about 100-m vertical extent) and horizontally spaced by about 300 m. This is consistent with theories predicting that the primary mechanism of eddy motion in high Reynolds number wall layers is ?top-down.? The layered structure of the surface layer also has a visible effect on vertical profiles of vertical velocity variance (w2) and momentum transport. In the ESL, w2 scales as z2/3 while it is constant or slightly decreases within the SSL. Concerning momentum transport, ejections contribute identically to the momentum flux as do sweeps in the ESL, whereas in the SSL, ejections give about 50% higher relative contribution.
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      The Structure of the Near-Neutral Atmospheric Surface Layer

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159998
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    contributor authorDrobinski, Philippe
    contributor authorCarlotti, Pierre
    contributor authorNewsom, Rob K.
    contributor authorBanta, Robert M.
    contributor authorFoster, Ralph C.
    contributor authorRedelsperger, Jean-Luc
    date accessioned2017-06-09T14:38:38Z
    date available2017-06-09T14:38:38Z
    date copyright2004/03/01
    date issued2004
    identifier issn0022-4928
    identifier otherams-23437.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159998
    description abstractRecent observational data (turbulence variables by sonic anemometers and three-dimensional flow pattern by Doppler lidar), obtained during the Cooperative Atmosphere Surface Exchange Study field campaign in October 1999 (CASES-99), show evidence of a layered structure of the near-neutral surface layer: (i) the eddy surface layer (ESL), which is the lower sublayer where blocking of impinging eddies is the dominating mechanism; and (ii) the shear surface layer (SSL), which is an intermediate sublayer, where shear affects the isotropy of turbulence. The origin of the eddies impinging from aloft (probably from the SSL) down to the ESL is preliminarily addressed in this study, since the Doppler lidar data show evidence of linearly organized eddies embedded in the surface layer (i.e., about 100-m vertical extent) and horizontally spaced by about 300 m. This is consistent with theories predicting that the primary mechanism of eddy motion in high Reynolds number wall layers is ?top-down.? The layered structure of the surface layer also has a visible effect on vertical profiles of vertical velocity variance (w2) and momentum transport. In the ESL, w2 scales as z2/3 while it is constant or slightly decreases within the SSL. Concerning momentum transport, ejections contribute identically to the momentum flux as do sweeps in the ESL, whereas in the SSL, ejections give about 50% higher relative contribution.
    publisherAmerican Meteorological Society
    titleThe Structure of the Near-Neutral Atmospheric Surface Layer
    typeJournal Paper
    journal volume61
    journal issue6
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2004)061<0699:TSOTNA>2.0.CO;2
    journal fristpage699
    journal lastpage714
    treeJournal of the Atmospheric Sciences:;2004:;Volume( 061 ):;issue: 006
    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