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    Obscured Overcast Sky Radiance Distributions for Ultraviolet and Photosynthetically Active Radiation

    Source: Journal of Applied Meteorology:;1997:;volume( 036 ):;issue: 010::page 1336
    Author:
    Grant, Richard H.
    ,
    Heisler, Gordon M.
    DOI: 10.1175/1520-0450(1997)036<1336:OOSRDF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Sky radiance measurements in the wavelength bands of ultraviolet-B (0.28?0.32 ?m), ultraviolet-A (0.32?0.40 ?m), and photosynthetically active radiation (0.40?0.70 ?m) were made under obscured overcast skies in a rural area. Radiance distributions were modeled for seven measurement scans with solar zenith angles varying from 19° to 49°. For the seven scans, the atmospheric transmittance of photosynthetically active photon flux density varied from 0.16 to 0.25. The corresponding fraction of cloud-free sky photosynthetically active photon flux density ranged from 0.21 to 0.32. The corresponding fraction of ultraviolet-B cloud-free sky irradiance was between 0.20 and 0.34, with typically lower fractions of cloud-free sky irradiance in the ultraviolet-B than in the photosynthetically active photon flux density. The sky radiance was modeled from the ensembled measurements according to the standard overcast sky radiance distribution for each of the wavelength bands. Although the ultraviolet wave bands had slightly greater normalized radiance at the zenith and smaller radiance at the horizon than has been found for the photosynthetically active radiation wave band, the differences between the photosynthetically active radiation and the ultraviolet-A and ultraviolet-B radiance distributions were not statistically significant. Therefore, the authors concluded that the normalized obscured overcast sky radiance distribution for all three wave bands could be satisfactorily described by the standard overcast sky model of the photosynthetically active radiation distribution.
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      Obscured Overcast Sky Radiance Distributions for Ultraviolet and Photosynthetically Active Radiation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4147891
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    contributor authorGrant, Richard H.
    contributor authorHeisler, Gordon M.
    date accessioned2017-06-09T14:06:25Z
    date available2017-06-09T14:06:25Z
    date copyright1997/10/01
    date issued1997
    identifier issn0894-8763
    identifier otherams-12540.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4147891
    description abstractSky radiance measurements in the wavelength bands of ultraviolet-B (0.28?0.32 ?m), ultraviolet-A (0.32?0.40 ?m), and photosynthetically active radiation (0.40?0.70 ?m) were made under obscured overcast skies in a rural area. Radiance distributions were modeled for seven measurement scans with solar zenith angles varying from 19° to 49°. For the seven scans, the atmospheric transmittance of photosynthetically active photon flux density varied from 0.16 to 0.25. The corresponding fraction of cloud-free sky photosynthetically active photon flux density ranged from 0.21 to 0.32. The corresponding fraction of ultraviolet-B cloud-free sky irradiance was between 0.20 and 0.34, with typically lower fractions of cloud-free sky irradiance in the ultraviolet-B than in the photosynthetically active photon flux density. The sky radiance was modeled from the ensembled measurements according to the standard overcast sky radiance distribution for each of the wavelength bands. Although the ultraviolet wave bands had slightly greater normalized radiance at the zenith and smaller radiance at the horizon than has been found for the photosynthetically active radiation wave band, the differences between the photosynthetically active radiation and the ultraviolet-A and ultraviolet-B radiance distributions were not statistically significant. Therefore, the authors concluded that the normalized obscured overcast sky radiance distribution for all three wave bands could be satisfactorily described by the standard overcast sky model of the photosynthetically active radiation distribution.
    publisherAmerican Meteorological Society
    titleObscured Overcast Sky Radiance Distributions for Ultraviolet and Photosynthetically Active Radiation
    typeJournal Paper
    journal volume36
    journal issue10
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1997)036<1336:OOSRDF>2.0.CO;2
    journal fristpage1336
    journal lastpage1345
    treeJournal of Applied Meteorology:;1997:;volume( 036 ):;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
    yabeshDSpacePersian