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    Comparison of Two Raindrop Size Distribution Retrieval Algorithms for X-Band Dual Polarization Observations

    Source: Journal of Hydrometeorology:;2008:;Volume( 009 ):;issue: 003::page 589
    Author:
    Anagnostou, Marios N.
    ,
    Anagnostou, Emmanouil N.
    ,
    Vivekanandan, Jothiram
    ,
    Ogden, Fred L.
    DOI: 10.1175/2007JHM904.1
    Publisher: American Meteorological Society
    Abstract: In this study the authors evaluate two algorithms, the so-called beta (?) and constrained methods, proposed for retrieving the governing parameters of the ?normalized? gamma drop size distribution (DSD) from dual-polarization radar measurements. The ? method treats the drop axis ratio as a variable and computes drop shape and DSD parameters from radar reflectivity (ZH), differential reflectivity (ZDR), and specific differential phase shift (KDP). The constrained method assumes that the axis-ratio relation is fixed and computes DSD parameters from ZH, ZDR, and an empirical relation between the DSD slope and shape parameters. The two techniques are evaluated for polarimetric X-band radar observations by comparing retrieved DSD parameters with disdrometer observations and examining simulated radar parameters for consistency. Error effects on the ? method and constrained method retrievals are analyzed. The ? approach is found to be sensitive to errors in KDP and to be less consistent with observations. Large retrieved ? values are found to be associated with large retrieved DSD shape parameters and small median drop diameters. The constrained method provides reasonable rain DSD retrievals that agree better with disdrometer observations.
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      Comparison of Two Raindrop Size Distribution Retrieval Algorithms for X-Band Dual Polarization Observations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4207212
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    contributor authorAnagnostou, Marios N.
    contributor authorAnagnostou, Emmanouil N.
    contributor authorVivekanandan, Jothiram
    contributor authorOgden, Fred L.
    date accessioned2017-06-09T16:20:02Z
    date available2017-06-09T16:20:02Z
    date copyright2008/06/01
    date issued2008
    identifier issn1525-755X
    identifier otherams-65932.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207212
    description abstractIn this study the authors evaluate two algorithms, the so-called beta (?) and constrained methods, proposed for retrieving the governing parameters of the ?normalized? gamma drop size distribution (DSD) from dual-polarization radar measurements. The ? method treats the drop axis ratio as a variable and computes drop shape and DSD parameters from radar reflectivity (ZH), differential reflectivity (ZDR), and specific differential phase shift (KDP). The constrained method assumes that the axis-ratio relation is fixed and computes DSD parameters from ZH, ZDR, and an empirical relation between the DSD slope and shape parameters. The two techniques are evaluated for polarimetric X-band radar observations by comparing retrieved DSD parameters with disdrometer observations and examining simulated radar parameters for consistency. Error effects on the ? method and constrained method retrievals are analyzed. The ? approach is found to be sensitive to errors in KDP and to be less consistent with observations. Large retrieved ? values are found to be associated with large retrieved DSD shape parameters and small median drop diameters. The constrained method provides reasonable rain DSD retrievals that agree better with disdrometer observations.
    publisherAmerican Meteorological Society
    titleComparison of Two Raindrop Size Distribution Retrieval Algorithms for X-Band Dual Polarization Observations
    typeJournal Paper
    journal volume9
    journal issue3
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/2007JHM904.1
    journal fristpage589
    journal lastpage600
    treeJournal of Hydrometeorology:;2008:;Volume( 009 ):;issue: 003
    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