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    The Effects of Nonuniform Beam Filling on Vertical Rainfall Velocity Measurements with a Spaceborne Doppler Radar

    Source: Journal of Atmospheric and Oceanic Technology:;2002:;volume( 019 ):;issue: 007::page 1019
    Author:
    Tanelli, Simone
    ,
    Im, Eastwood
    ,
    Durden, Stephen L.
    ,
    Facheris, Luca
    ,
    Giuli, Dino
    DOI: 10.1175/1520-0426(2002)019<1019:TEONBF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Information on the global distribution of vertical velocity of precipitating particles is needed in estimating latent heat fluxes, and therefore in the general study of energy transportation phenomena in the atmosphere. Such information is not currently available, but it can potentially be obtained by a spaceborne Doppler precipitation radar. In this paper, the expected performance for this type of Doppler radar for measuring vertical rainfall velocity is investigated. Although the high relative speed of the instrument with respect to the rainfall droplets contributes significantly to the spreading of the Doppler spectrum, accurate estimates of the average vertical velocity can be obtained when the rainfall intensity does not vary significantly within the resolution volume of the instrument. Such a result can be inferred through theoretical calculations and is confirmed by analyzing the Doppler spectra simulated using data gathered by the NASA/Jet Propulsion Laboratory (JPL) airborne rain radar in the Kwajelein Experiment (KWAJEX) and in the Tropical Ocean Global Atmosphere Coupled Ocean?Atmosphere Response Experiment (TOGA COARE). When significant variation in rain rate is present within the radar's field of view in the along-track direction, the Doppler shift caused by the radial component of the satellite motion is weighted differently in different portions of resolution cell. The error caused by this nonuniform beam-filling (NUBF) effect may dominate any other contribution. Under this condition, the shape, average value, and width of the Doppler spectrum do not directly correlate with the vertical velocity of the precipitating particles. Further analysis of the reflectivity pattern is required in order to correct for the NUBF-induced error.
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      The Effects of Nonuniform Beam Filling on Vertical Rainfall Velocity Measurements with a Spaceborne Doppler Radar

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156324
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    contributor authorTanelli, Simone
    contributor authorIm, Eastwood
    contributor authorDurden, Stephen L.
    contributor authorFacheris, Luca
    contributor authorGiuli, Dino
    date accessioned2017-06-09T14:29:08Z
    date available2017-06-09T14:29:08Z
    date copyright2002/07/01
    date issued2002
    identifier issn0739-0572
    identifier otherams-2013.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156324
    description abstractInformation on the global distribution of vertical velocity of precipitating particles is needed in estimating latent heat fluxes, and therefore in the general study of energy transportation phenomena in the atmosphere. Such information is not currently available, but it can potentially be obtained by a spaceborne Doppler precipitation radar. In this paper, the expected performance for this type of Doppler radar for measuring vertical rainfall velocity is investigated. Although the high relative speed of the instrument with respect to the rainfall droplets contributes significantly to the spreading of the Doppler spectrum, accurate estimates of the average vertical velocity can be obtained when the rainfall intensity does not vary significantly within the resolution volume of the instrument. Such a result can be inferred through theoretical calculations and is confirmed by analyzing the Doppler spectra simulated using data gathered by the NASA/Jet Propulsion Laboratory (JPL) airborne rain radar in the Kwajelein Experiment (KWAJEX) and in the Tropical Ocean Global Atmosphere Coupled Ocean?Atmosphere Response Experiment (TOGA COARE). When significant variation in rain rate is present within the radar's field of view in the along-track direction, the Doppler shift caused by the radial component of the satellite motion is weighted differently in different portions of resolution cell. The error caused by this nonuniform beam-filling (NUBF) effect may dominate any other contribution. Under this condition, the shape, average value, and width of the Doppler spectrum do not directly correlate with the vertical velocity of the precipitating particles. Further analysis of the reflectivity pattern is required in order to correct for the NUBF-induced error.
    publisherAmerican Meteorological Society
    titleThe Effects of Nonuniform Beam Filling on Vertical Rainfall Velocity Measurements with a Spaceborne Doppler Radar
    typeJournal Paper
    journal volume19
    journal issue7
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/1520-0426(2002)019<1019:TEONBF>2.0.CO;2
    journal fristpage1019
    journal lastpage1034
    treeJournal of Atmospheric and Oceanic Technology:;2002:;volume( 019 ):;issue: 007
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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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