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    Clear-Sky Direct-Beam Solar Radiation Versus Altitude: A Proposal for Standard Soundings

    Source: Journal of Applied Meteorology:;1979:;volume( 019 ):;issue: 011::page 1323
    Author:
    Lowry, William P.
    DOI: 10.1175/1520-0450(1980)019<1323:CSDBSR>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The author reexamines Klein's (1948) quantitative statements relating clear-sky direct-beam solar radiation to altitude for the lower troposphere, which are of the form (transmissivity) = B + A log (altitude). Klein's summaries are judged to be the best general statements on the subject previously published, but the author proposes a different empirical formulation which is based on more direct physical reasoning and which yields a better statistical fit when applied to Klein's data. The author also proposes, for informal adoption, two standard soundings (moist and dry) of zenith path clear-sky direct-beam transmissivity τp as a function of pressure p in the form ln(C ? τp) = InM + Np, where C is a constant with value near 0.975, the approximate transmissivity just below the high atmospheric ozone layer. For use in estimations of transmissivity tp with nonzero zenith angles, the author presents, as part of his proposal, altitude-dependent estimators for the adjustment parameter ap, suggested by Williams (1976) in the form lntp = (secZ) ln[τp + ap ln(secZ)] where Z is the zenith angle.
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      Clear-Sky Direct-Beam Solar Radiation Versus Altitude: A Proposal for Standard Soundings

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    contributor authorLowry, William P.
    date accessioned2017-06-09T17:40:41Z
    date available2017-06-09T17:40:41Z
    date copyright1980/11/01
    date issued1979
    identifier issn0021-8952
    identifier otherams-9989.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4233537
    description abstractThe author reexamines Klein's (1948) quantitative statements relating clear-sky direct-beam solar radiation to altitude for the lower troposphere, which are of the form (transmissivity) = B + A log (altitude). Klein's summaries are judged to be the best general statements on the subject previously published, but the author proposes a different empirical formulation which is based on more direct physical reasoning and which yields a better statistical fit when applied to Klein's data. The author also proposes, for informal adoption, two standard soundings (moist and dry) of zenith path clear-sky direct-beam transmissivity τp as a function of pressure p in the form ln(C ? τp) = InM + Np, where C is a constant with value near 0.975, the approximate transmissivity just below the high atmospheric ozone layer. For use in estimations of transmissivity tp with nonzero zenith angles, the author presents, as part of his proposal, altitude-dependent estimators for the adjustment parameter ap, suggested by Williams (1976) in the form lntp = (secZ) ln[τp + ap ln(secZ)] where Z is the zenith angle.
    publisherAmerican Meteorological Society
    titleClear-Sky Direct-Beam Solar Radiation Versus Altitude: A Proposal for Standard Soundings
    typeJournal Paper
    journal volume19
    journal issue11
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1980)019<1323:CSDBSR>2.0.CO;2
    journal fristpage1323
    journal lastpage1327
    treeJournal of Applied Meteorology:;1979:;volume( 019 ):;issue: 011
    contenttypeFulltext
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