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    Non-Rayleigh Scattering Effect in Rain Observations by an X- and Ka-band Dual-Wavelength Radar

    Source: Journal of Atmospheric and Oceanic Technology:;1991:;volume( 008 ):;issue: 003::page 352
    Author:
    Nakamura, Kenji
    ,
    Inomata, Hideyuki
    DOI: 10.1175/1520-0426(1991)008<0352:NRSEIR>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The effect of non-Rayleigh scattering appearing in a rain observation experiment using a dual-wavelength rain radar, is investigated. The non-Rayleigh scattering effect causes a small difference between the effective radar reflectivity factor and the actual radar reflectivity factor that is defined as the summation of the sixth power of raindrop diameter in a unit volume. This difference causes errors in the rain retrieval algorithm based on attenuation. A simultaneous rain observation by a dual-wavelength radar and a C-band Doppler radar was performed to confirm the existence of the non-Rayleigh scattering effect. Raindrop-size distributions are estimated from Doppler spectra at C band measured by the vertically pointing Doppler radar. The difference between effective radar reflectivity factors at X and Ka band was determined in two different ways. One way was to estimate the difference in the effective radar reflectivity factors at these wavelengths based upon raindrop-size spectra determined from the Doppler spectra of the C-band radar. The second was to use the measured values of the effective radar reflectivity factors obtained directly from the X- and Ka-band radar. It is found that both differences vary according to the raindrop-size distribution variations and have a good correlation in a time scale of less than a few minutes. This fact confirms that the effective radar reflectivity factors are affected by the non-Rayleigh scattering.
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      Non-Rayleigh Scattering Effect in Rain Observations by an X- and Ka-band Dual-Wavelength Radar

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4206733
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    contributor authorNakamura, Kenji
    contributor authorInomata, Hideyuki
    date accessioned2017-06-09T16:18:40Z
    date available2017-06-09T16:18:40Z
    date copyright1991/06/01
    date issued1991
    identifier issn0739-0572
    identifier otherams-655.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206733
    description abstractThe effect of non-Rayleigh scattering appearing in a rain observation experiment using a dual-wavelength rain radar, is investigated. The non-Rayleigh scattering effect causes a small difference between the effective radar reflectivity factor and the actual radar reflectivity factor that is defined as the summation of the sixth power of raindrop diameter in a unit volume. This difference causes errors in the rain retrieval algorithm based on attenuation. A simultaneous rain observation by a dual-wavelength radar and a C-band Doppler radar was performed to confirm the existence of the non-Rayleigh scattering effect. Raindrop-size distributions are estimated from Doppler spectra at C band measured by the vertically pointing Doppler radar. The difference between effective radar reflectivity factors at X and Ka band was determined in two different ways. One way was to estimate the difference in the effective radar reflectivity factors at these wavelengths based upon raindrop-size spectra determined from the Doppler spectra of the C-band radar. The second was to use the measured values of the effective radar reflectivity factors obtained directly from the X- and Ka-band radar. It is found that both differences vary according to the raindrop-size distribution variations and have a good correlation in a time scale of less than a few minutes. This fact confirms that the effective radar reflectivity factors are affected by the non-Rayleigh scattering.
    publisherAmerican Meteorological Society
    titleNon-Rayleigh Scattering Effect in Rain Observations by an X- and Ka-band Dual-Wavelength Radar
    typeJournal Paper
    journal volume8
    journal issue3
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/1520-0426(1991)008<0352:NRSEIR>2.0.CO;2
    journal fristpage352
    journal lastpage362
    treeJournal of Atmospheric and Oceanic Technology:;1991:;volume( 008 ):;issue: 003
    contenttypeFulltext
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