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    Polarimetric Estimates of a 1-Month Accumulation of Light Rain with a 3-cm Wavelength Radar

    Source: Journal of Hydrometeorology:;2011:;Volume( 012 ):;issue: 005::page 1024
    Author:
    Borowska, L.
    ,
    Zrnić, D.
    ,
    Ryzhkov, A.
    ,
    Zhang, P.
    ,
    Simmer, C.
    DOI: 10.1175/2011JHM1339.1
    Publisher: American Meteorological Society
    Abstract: he authors evaluate rainfall estimates from the new polarimetric X-band radar at Bonn, Germany, for a period between mid-November and the end of December 2009 by comparison with rain gauges. The emphasis is on slightly more than 1-month accumulations over areas minimally affected by beam blockage. The rain regime was characterized by reflectivities mainly below 45 dBZ, maximum observed rain rates of 47 mm h?1, a mean rain rate of 0.1 mm h?1, and brightband altitudes between 0.6 and 2.4 km above the ground. Both the reflectivity factor and the specific differential phase are used to obtain the rain rates. The accuracy of rain total estimates is evaluated from the statistics of the differences between radar and rain gauge measurements. Polarimetry provides improvement in the statistics of reflectivity-based measurements by reducing the bias and RMS errors from ?25% to 7% and from 33% to 17%, respectively. Essential to this improvement is separation of the data into those attributed to pure rain, those from the bright band, and those due to nonmeteorological scatterers. A type-specific (rain or wet snow) relation is applied to obtain the rain rate by matching on the average the contribution by wet snow to the radar-measured rainfall below the bright band. The measurement of rain using specific differential phase is the most robust and can be applied to the very low rain rates and still produce credible accumulation estimates characterized with a standard deviation of 11% but a bias of ?25%. A composite estimator is also tested and discussed.
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      Polarimetric Estimates of a 1-Month Accumulation of Light Rain with a 3-cm Wavelength Radar

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4213975
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    contributor authorBorowska, L.
    contributor authorZrnić, D.
    contributor authorRyzhkov, A.
    contributor authorZhang, P.
    contributor authorSimmer, C.
    date accessioned2017-06-09T16:40:34Z
    date available2017-06-09T16:40:34Z
    date copyright2011/10/01
    date issued2011
    identifier issn1525-755X
    identifier otherams-72018.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4213975
    description abstracthe authors evaluate rainfall estimates from the new polarimetric X-band radar at Bonn, Germany, for a period between mid-November and the end of December 2009 by comparison with rain gauges. The emphasis is on slightly more than 1-month accumulations over areas minimally affected by beam blockage. The rain regime was characterized by reflectivities mainly below 45 dBZ, maximum observed rain rates of 47 mm h?1, a mean rain rate of 0.1 mm h?1, and brightband altitudes between 0.6 and 2.4 km above the ground. Both the reflectivity factor and the specific differential phase are used to obtain the rain rates. The accuracy of rain total estimates is evaluated from the statistics of the differences between radar and rain gauge measurements. Polarimetry provides improvement in the statistics of reflectivity-based measurements by reducing the bias and RMS errors from ?25% to 7% and from 33% to 17%, respectively. Essential to this improvement is separation of the data into those attributed to pure rain, those from the bright band, and those due to nonmeteorological scatterers. A type-specific (rain or wet snow) relation is applied to obtain the rain rate by matching on the average the contribution by wet snow to the radar-measured rainfall below the bright band. The measurement of rain using specific differential phase is the most robust and can be applied to the very low rain rates and still produce credible accumulation estimates characterized with a standard deviation of 11% but a bias of ?25%. A composite estimator is also tested and discussed.
    publisherAmerican Meteorological Society
    titlePolarimetric Estimates of a 1-Month Accumulation of Light Rain with a 3-cm Wavelength Radar
    typeJournal Paper
    journal volume12
    journal issue5
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/2011JHM1339.1
    journal fristpage1024
    journal lastpage1039
    treeJournal of Hydrometeorology:;2011:;Volume( 012 ):;issue: 005
    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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