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    An Indirect Estimation of Convective Boundary Layer Structure for Use in Pollution Dispersion Models

    Source: Journal of Climate and Applied Meteorology:;1986:;Volume( 025 ):;Issue: 011::page 1609
    Author:
    Wilczak, James M.
    ,
    Phillips, Mary Sue
    DOI: 10.1175/1520-0450(1986)025<1609:AIEOCB>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Dispersion models of the convectively driven atmospheric boundary layer (ABL) often require as input meteorological parameters that are not routinely measured. These parameters usually include the surface fluxes of heat and momentum ?Cpw???and ?u?w?, the height of the capping inversion Zi, the mean wind speed ?(z), wind direction AZ(z) and potential temperature profiles ?macr;(z) up to Zi, and the profiles of the turbulent wind components σu(z), σv(z), and σw(z). Through use of a simple inversion rise model, surface layer flux-profile relationships, and similarity scaling laws for the convective ABL, we demonstrate the accuracy with which the required meteorological parameters can be deduced using much simpler and more readily available measurements. These measurements consist of an early morning temperature profile obtained from a radiosonde ascent; surface layer values of ?, AZ, σu and σv at a single level; either two levels of mean temperature near the surface, or alternatively the incoming solar radiation; and an estimate of the local surface roughness. Predicted values of each of the required parameters are compared with directly measured values, as a function of height or of time, for 26 days of data. Except for AZ(z), each of these parameters can be estimated with a mean bias of less than 15% and a standard deviation ranging from 10 to 40%. In contrast, simple AZ parameterizations often fail to predict the observed wind direction profile accurately; it is suggested that this is due to large-scale terrain inhomogeneities. The role of averaging time in estimating the error of an individual realization is discussed.
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      An Indirect Estimation of Convective Boundary Layer Structure for Use in Pollution Dispersion Models

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4146267
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    contributor authorWilczak, James M.
    contributor authorPhillips, Mary Sue
    date accessioned2017-06-09T14:01:26Z
    date available2017-06-09T14:01:26Z
    date copyright1986/11/01
    date issued1986
    identifier issn0733-3021
    identifier otherams-11079.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4146267
    description abstractDispersion models of the convectively driven atmospheric boundary layer (ABL) often require as input meteorological parameters that are not routinely measured. These parameters usually include the surface fluxes of heat and momentum ?Cpw???and ?u?w?, the height of the capping inversion Zi, the mean wind speed ?(z), wind direction AZ(z) and potential temperature profiles ?macr;(z) up to Zi, and the profiles of the turbulent wind components σu(z), σv(z), and σw(z). Through use of a simple inversion rise model, surface layer flux-profile relationships, and similarity scaling laws for the convective ABL, we demonstrate the accuracy with which the required meteorological parameters can be deduced using much simpler and more readily available measurements. These measurements consist of an early morning temperature profile obtained from a radiosonde ascent; surface layer values of ?, AZ, σu and σv at a single level; either two levels of mean temperature near the surface, or alternatively the incoming solar radiation; and an estimate of the local surface roughness. Predicted values of each of the required parameters are compared with directly measured values, as a function of height or of time, for 26 days of data. Except for AZ(z), each of these parameters can be estimated with a mean bias of less than 15% and a standard deviation ranging from 10 to 40%. In contrast, simple AZ parameterizations often fail to predict the observed wind direction profile accurately; it is suggested that this is due to large-scale terrain inhomogeneities. The role of averaging time in estimating the error of an individual realization is discussed.
    publisherAmerican Meteorological Society
    titleAn Indirect Estimation of Convective Boundary Layer Structure for Use in Pollution Dispersion Models
    typeJournal Paper
    journal volume25
    journal issue11
    journal titleJournal of Climate and Applied Meteorology
    identifier doi10.1175/1520-0450(1986)025<1609:AIEOCB>2.0.CO;2
    journal fristpage1609
    journal lastpage1624
    treeJournal of Climate and Applied Meteorology:;1986:;Volume( 025 ):;Issue: 011
    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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