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    The Turbulent Structure of the Stable, Nocturnal Boundary Layer

    Source: Journal of the Atmospheric Sciences:;1984:;Volume( 041 ):;issue: 014::page 2202
    Author:
    Nieuwstadt, F. T. M.
    DOI: 10.1175/1520-0469(1984)041<2202:TTSOTS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A large number of turbulence observations were made under stable conditions along a meteorological mast at Cabauw, The Netherlands. To present and organize these data we turn to the parameterized equations for the turbulent variances and covariances. In a dimensionless form these equations lead to a local scaling hypothesis. According to this hypothesis, dimensionless combinations of variables which are measured at the same height can be expressed as a function of a single parameter z/?. Here, ? is called a local Obukhov length and is defined as ?=?τ3/2T/(kgw?) where τ and w?) are the kinematic momentum and heat flux, respectively. Note that, in general, ? may vary across the boundary layer, because τ and w? are still unknown functions of height. The observations support local scaling. In particular, they agree with the limit condition for z/??∞, which predicts that locally scaled variables approach a constant value. The latter result is called z-less stratification. An important application of z-less stratification is that both the Richardson number and flux Richardson number should become constant in the stable boundary layer. Next we turn to the vertical profiles of τ and w?. These profiles can be obtained in principle from a simple boundary-layer model which uses as a closure hypothesis the constant Richardson number and flux Richardson number. The solution for steady-sate conditions loads to w?/w?0;=(1?z/h)) and τ/u*2=((1?z/h)3/2, where ;w?0 and u*2, are the surface temperature and momentum fluxes, respectively, and h is the boundary-layer height. Observations at Cabauw agree reasonably well with these profiles. However, they should not be considered as generally valid similarity expressions.
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      The Turbulent Structure of the Stable, Nocturnal Boundary Layer

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    contributor authorNieuwstadt, F. T. M.
    date accessioned2017-06-09T14:25:03Z
    date available2017-06-09T14:25:03Z
    date copyright1984/07/01
    date issued1984
    identifier issn0022-4928
    identifier otherams-18881.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4154935
    description abstractA large number of turbulence observations were made under stable conditions along a meteorological mast at Cabauw, The Netherlands. To present and organize these data we turn to the parameterized equations for the turbulent variances and covariances. In a dimensionless form these equations lead to a local scaling hypothesis. According to this hypothesis, dimensionless combinations of variables which are measured at the same height can be expressed as a function of a single parameter z/?. Here, ? is called a local Obukhov length and is defined as ?=?τ3/2T/(kgw?) where τ and w?) are the kinematic momentum and heat flux, respectively. Note that, in general, ? may vary across the boundary layer, because τ and w? are still unknown functions of height. The observations support local scaling. In particular, they agree with the limit condition for z/??∞, which predicts that locally scaled variables approach a constant value. The latter result is called z-less stratification. An important application of z-less stratification is that both the Richardson number and flux Richardson number should become constant in the stable boundary layer. Next we turn to the vertical profiles of τ and w?. These profiles can be obtained in principle from a simple boundary-layer model which uses as a closure hypothesis the constant Richardson number and flux Richardson number. The solution for steady-sate conditions loads to w?/w?0;=(1?z/h)) and τ/u*2=((1?z/h)3/2, where ;w?0 and u*2, are the surface temperature and momentum fluxes, respectively, and h is the boundary-layer height. Observations at Cabauw agree reasonably well with these profiles. However, they should not be considered as generally valid similarity expressions.
    publisherAmerican Meteorological Society
    titleThe Turbulent Structure of the Stable, Nocturnal Boundary Layer
    typeJournal Paper
    journal volume41
    journal issue14
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1984)041<2202:TTSOTS>2.0.CO;2
    journal fristpage2202
    journal lastpage2216
    treeJournal of the Atmospheric Sciences:;1984:;Volume( 041 ):;issue: 014
    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