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    The Effect of a Nonuniform Planetary Albedo on the Interpretation of Earth Radiation Budget Observations

    Source: Journal of the Atmospheric Sciences:;1980:;Volume( 037 ):;issue: 006::page 1262
    Author:
    King, Michael D.
    ,
    Curran, Robert J.
    DOI: 10.1175/1520-0469(1980)037<1262:TEOANP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The flux density measured at satellite altitude with a fixed field of view radiometer differs from the true flux density reflected by the earth-atmosphere system within the field of view of the radiometer. This difference is due to angular response characteristics of the radiometer, solid angle effects due to geometry, and angular reflectance effects of the earth-atmosphere system. All of these effects lead to uncertainties in the interpretation of instantaneous earth radiation budget measurements. The differences between the true flux density and the measured flux density are shown to be significant when the field of view of the radiometer is, large and when the atmosphere has a nonuniform, or spatially dependent, reflectance (albedo). A simulation experiment is described whereby the scene within the field of view of a nadir looking sensor is divided into a large number of equal area elements, each of which reflects radiation with one of two different reflectance models (corresponding to cloud-free and cloudy areas). The conditional mean values of the measured flux density, given values of the true flux density, are shown to differ significantly from the conditional means of the inverse problem, that of finding the mean value of the true flux density given a value for the measured flux density. The differences between the true flux density and the measured flux density are examined as a function of satellite altitude, field of view of the radiometer and solar zenith angle (including the effects of a terminator within the field of view) for both Lambertian and non-Lambertian reflectance models.
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      The Effect of a Nonuniform Planetary Albedo on the Interpretation of Earth Radiation Budget Observations

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    contributor authorKing, Michael D.
    contributor authorCurran, Robert J.
    date accessioned2017-06-09T14:21:33Z
    date available2017-06-09T14:21:33Z
    date copyright1980/06/01
    date issued1980
    identifier issn0022-4928
    identifier otherams-17932.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4153881
    description abstractThe flux density measured at satellite altitude with a fixed field of view radiometer differs from the true flux density reflected by the earth-atmosphere system within the field of view of the radiometer. This difference is due to angular response characteristics of the radiometer, solid angle effects due to geometry, and angular reflectance effects of the earth-atmosphere system. All of these effects lead to uncertainties in the interpretation of instantaneous earth radiation budget measurements. The differences between the true flux density and the measured flux density are shown to be significant when the field of view of the radiometer is, large and when the atmosphere has a nonuniform, or spatially dependent, reflectance (albedo). A simulation experiment is described whereby the scene within the field of view of a nadir looking sensor is divided into a large number of equal area elements, each of which reflects radiation with one of two different reflectance models (corresponding to cloud-free and cloudy areas). The conditional mean values of the measured flux density, given values of the true flux density, are shown to differ significantly from the conditional means of the inverse problem, that of finding the mean value of the true flux density given a value for the measured flux density. The differences between the true flux density and the measured flux density are examined as a function of satellite altitude, field of view of the radiometer and solar zenith angle (including the effects of a terminator within the field of view) for both Lambertian and non-Lambertian reflectance models.
    publisherAmerican Meteorological Society
    titleThe Effect of a Nonuniform Planetary Albedo on the Interpretation of Earth Radiation Budget Observations
    typeJournal Paper
    journal volume37
    journal issue6
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1980)037<1262:TEOANP>2.0.CO;2
    journal fristpage1262
    journal lastpage1278
    treeJournal of the Atmospheric Sciences:;1980:;Volume( 037 ):;issue: 006
    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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