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    Radar Backscattering by Inhomogeneous Precipitation Particles

    Source: Journal of the Atmospheric Sciences:;1980:;Volume( 037 ):;issue: 008::page 1821
    Author:
    Bohren, Craig F.
    ,
    Battan, Louis J.
    DOI: 10.1175/1520-0469(1980)037<1821:RBBIPP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. Although apparently different, two are shown to be equivalent: the effective-medium and Polder-van Santen theories. All the dielectric functions agree when the two components are dielectrically similar. All except the Maxwell-Garnet dielectric function are symmetric with respect to interchange of the components. When compared with measurements on ice-air mixtures, the effective-medium and Maxwell-Garnet dielectric functions are marginally better than the Debye function, which has previously been used in backscattering calculations. When the fraction of water is high, the effective-medium function gives calculated values of radar backscattering that are in good agreement with measurements on ice spheres coated with a mixture of ice and water. The Maxwell-Garnet theory, with ice inclusions embedded in a water matrix, is also in good agreement with these measurements, and is so over a wider range of water-volume fractions than the effective-medium theory. Although there are no compelling reasons for preferring one above the other, on the basis of the evidence presented, we would be inclined to use the Maxwell-Garnet dielectric function in radar backscattering calculations.
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      Radar Backscattering by Inhomogeneous Precipitation Particles

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4153930
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    contributor authorBohren, Craig F.
    contributor authorBattan, Louis J.
    date accessioned2017-06-09T14:21:42Z
    date available2017-06-09T14:21:42Z
    date copyright1980/08/01
    date issued1980
    identifier issn0022-4928
    identifier otherams-17977.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4153930
    description abstractCalculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. Although apparently different, two are shown to be equivalent: the effective-medium and Polder-van Santen theories. All the dielectric functions agree when the two components are dielectrically similar. All except the Maxwell-Garnet dielectric function are symmetric with respect to interchange of the components. When compared with measurements on ice-air mixtures, the effective-medium and Maxwell-Garnet dielectric functions are marginally better than the Debye function, which has previously been used in backscattering calculations. When the fraction of water is high, the effective-medium function gives calculated values of radar backscattering that are in good agreement with measurements on ice spheres coated with a mixture of ice and water. The Maxwell-Garnet theory, with ice inclusions embedded in a water matrix, is also in good agreement with these measurements, and is so over a wider range of water-volume fractions than the effective-medium theory. Although there are no compelling reasons for preferring one above the other, on the basis of the evidence presented, we would be inclined to use the Maxwell-Garnet dielectric function in radar backscattering calculations.
    publisherAmerican Meteorological Society
    titleRadar Backscattering by Inhomogeneous Precipitation Particles
    typeJournal Paper
    journal volume37
    journal issue8
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1980)037<1821:RBBIPP>2.0.CO;2
    journal fristpage1821
    journal lastpage1827
    treeJournal of the Atmospheric Sciences:;1980:;Volume( 037 ):;issue: 008
    contenttypeFulltext
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