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    Absolute Calibration of Radar Reflectivity Using Redundancy of the Polarization Observations and Implied Constraints on Drop Shapes

    Source: Journal of Atmospheric and Oceanic Technology:;2009:;volume( 026 ):;issue: 004::page 689
    Author:
    Gourley, Jonathan J.
    ,
    Illingworth, Anthony J.
    ,
    Tabary, Pierre
    DOI: 10.1175/2008JTECHA1152.1
    Publisher: American Meteorological Society
    Abstract: A major limitation of improved radar-based rainfall estimation is accurate calibration of radar reflectivity. In this paper, the authors fully automate a polarimetric method that uses the consistency between radar reflectivity, differential reflectivity, and the path integral of specific differential phase to calibrate reflectivity. Complete instructions are provided such that this study can serve as a guide for agencies that are upgrading their radars with polarimetric capabilities and require accurate calibration. The method is demonstrated using data from Météo-France?s operational C-band polarimetric radar. Daily averages of the calibration of radar reflectivity are shown to vary by less than 0.2 dB. In addition to achieving successful calibration, a sensitivity test is also conducted to examine the impacts of using different models relating raindrop oblateness to diameter. It turns out that this study highlights the suitability of the raindrop shape models themselves. Evidence is shown supporting the notion that there is a unique model that relates drop oblateness to diameter in midlatitudes.
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      Absolute Calibration of Radar Reflectivity Using Redundancy of the Polarization Observations and Implied Constraints on Drop Shapes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4209161
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    contributor authorGourley, Jonathan J.
    contributor authorIllingworth, Anthony J.
    contributor authorTabary, Pierre
    date accessioned2017-06-09T16:25:42Z
    date available2017-06-09T16:25:42Z
    date copyright2009/04/01
    date issued2009
    identifier issn0739-0572
    identifier otherams-67687.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209161
    description abstractA major limitation of improved radar-based rainfall estimation is accurate calibration of radar reflectivity. In this paper, the authors fully automate a polarimetric method that uses the consistency between radar reflectivity, differential reflectivity, and the path integral of specific differential phase to calibrate reflectivity. Complete instructions are provided such that this study can serve as a guide for agencies that are upgrading their radars with polarimetric capabilities and require accurate calibration. The method is demonstrated using data from Météo-France?s operational C-band polarimetric radar. Daily averages of the calibration of radar reflectivity are shown to vary by less than 0.2 dB. In addition to achieving successful calibration, a sensitivity test is also conducted to examine the impacts of using different models relating raindrop oblateness to diameter. It turns out that this study highlights the suitability of the raindrop shape models themselves. Evidence is shown supporting the notion that there is a unique model that relates drop oblateness to diameter in midlatitudes.
    publisherAmerican Meteorological Society
    titleAbsolute Calibration of Radar Reflectivity Using Redundancy of the Polarization Observations and Implied Constraints on Drop Shapes
    typeJournal Paper
    journal volume26
    journal issue4
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/2008JTECHA1152.1
    journal fristpage689
    journal lastpage703
    treeJournal of Atmospheric and Oceanic Technology:;2009:;volume( 026 ):;issue: 004
    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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