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    The Chemistry of a Dry Cloud: The Effects of Radiation and Turbulence

    Source: Journal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 010::page 1573
    Author:
    Vilà-Guerau de Arellano, Jordi
    ,
    Cuijpers, Joannes W. M.
    DOI: 10.1175/1520-0469(2000)057<1573:TCOADC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The combined effect of ultraviolet radiation and turbulent mixing on chemistry in a cloud-topped boundary layer is investigated. The authors study a flow driven by longwave radiative cooling at cloud top. They consider a chemical cycle that is composed of a first-order reaction whose photodissociation rate depends on the cloud properties and time and a second-order chemical reaction between an abundant entrained reactant and a species with an initial concentration in the boundary layer. This turbulent reacting flow is represented numerically by means of a large eddy simulation. The simulation does not take evaporative cooling and aqueous-phase chemistry into account; that is, the authors simulate a dry smoke cloud. The vertical concentration profiles of the reactants not in excess clearly show the appearance of gradients due to the chemical sources and sinks in the cloud. Moreover, the vertical-flux profiles depart from a linear profile. Fluxes that, in the absence of chemistry, are directed upward could change direction due to the different chemical reaction rate constants inside and below the cloud and because of the dominant downward motions generated by radiative cooling. The flux-budget analysis shows the relevance of the chemical term for the nonabundant species inside of the cloud. The exchange flux between the free troposphere and the boundary layer also depends on the chemical transformation above and in the cloud. An expression for the exchange velocity of reactive species is proposed in terms of an in-cloud flux, the production?depletion chemical rates, and the concentration jump at the inversion height. The calculated exchange velocity values for the smoke and the reactants differ considerably.
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      The Chemistry of a Dry Cloud: The Effects of Radiation and Turbulence

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159078
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    contributor authorVilà-Guerau de Arellano, Jordi
    contributor authorCuijpers, Joannes W. M.
    date accessioned2017-06-09T14:36:15Z
    date available2017-06-09T14:36:15Z
    date copyright2000/05/01
    date issued2000
    identifier issn0022-4928
    identifier otherams-22609.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159078
    description abstractThe combined effect of ultraviolet radiation and turbulent mixing on chemistry in a cloud-topped boundary layer is investigated. The authors study a flow driven by longwave radiative cooling at cloud top. They consider a chemical cycle that is composed of a first-order reaction whose photodissociation rate depends on the cloud properties and time and a second-order chemical reaction between an abundant entrained reactant and a species with an initial concentration in the boundary layer. This turbulent reacting flow is represented numerically by means of a large eddy simulation. The simulation does not take evaporative cooling and aqueous-phase chemistry into account; that is, the authors simulate a dry smoke cloud. The vertical concentration profiles of the reactants not in excess clearly show the appearance of gradients due to the chemical sources and sinks in the cloud. Moreover, the vertical-flux profiles depart from a linear profile. Fluxes that, in the absence of chemistry, are directed upward could change direction due to the different chemical reaction rate constants inside and below the cloud and because of the dominant downward motions generated by radiative cooling. The flux-budget analysis shows the relevance of the chemical term for the nonabundant species inside of the cloud. The exchange flux between the free troposphere and the boundary layer also depends on the chemical transformation above and in the cloud. An expression for the exchange velocity of reactive species is proposed in terms of an in-cloud flux, the production?depletion chemical rates, and the concentration jump at the inversion height. The calculated exchange velocity values for the smoke and the reactants differ considerably.
    publisherAmerican Meteorological Society
    titleThe Chemistry of a Dry Cloud: The Effects of Radiation and Turbulence
    typeJournal Paper
    journal volume57
    journal issue10
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2000)057<1573:TCOADC>2.0.CO;2
    journal fristpage1573
    journal lastpage1584
    treeJournal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 010
    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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