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    Correction of Radar Reflectivity and Differential Reflectivity for Rain Attenuation at X Band. Part I: Theoretical and Empirical Basis

    Source: Journal of Atmospheric and Oceanic Technology:;2005:;volume( 022 ):;issue: 011::page 1621
    Author:
    Park, S-G.
    ,
    Bringi, V. N.
    ,
    Chandrasekar, V.
    ,
    Maki, M.
    ,
    Iwanami, K.
    DOI: 10.1175/JTECH1803.1
    Publisher: American Meteorological Society
    Abstract: In this two-part paper, a correction for rain attenuation of radar reflectivity (ZH) and differential reflectivity (ZDR) at the X-band wavelength is presented. The correction algorithm that is used is based on the self-consistent method with constraints proposed by Bringi et al., which was originally developed and evaluated for C-band polarimetric radar data. The self-consistent method is modified for the X-band frequency and is applied to radar measurements made with the multiparameter radar at the X-band wavelength (MP-X) operated by the National Research Institute for Earth Science and Disaster Prevention (NIED) in Japan. In this paper, characteristic properties of relations among polarimetric variables, such as AH?KDP, ADP?AH, AH?ZH, and ZDR?ZH, that are required in the correction methodology are presented for the frequency of the MP-X radar (9.375 GHz), based on scattering simulations using drop spectra measured by disdrometers at the surface. The scattering simulations were performed under conditions of three different temperatures and three different relations for drop shapes, in order to consider variability of polarimetric variables for these conditions. For the X-band wavelength, the AH?KDP and ADP?AH relations can be assumed to be nearly linear. The coefficient α of the AH?KDP relation varies over a wide range from 0.139 to 0.335 dB (°)?1 with a mean value of 0.254 dB (°)?1. The coefficient ? of the ADP?AH relation varies from 0.114 to 0.174, with a mean value of 0.139. The exponent b of the AH?ZH relation does not depend on drop shapes and is almost constant for a given temperature (about 0.78 at the temperature of 15°C). The ZDR?ZH relation depends primarily on drop shape, and does not vary with temperature.
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      Correction of Radar Reflectivity and Differential Reflectivity for Rain Attenuation at X Band. Part I: Theoretical and Empirical Basis

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4227495
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    contributor authorPark, S-G.
    contributor authorBringi, V. N.
    contributor authorChandrasekar, V.
    contributor authorMaki, M.
    contributor authorIwanami, K.
    date accessioned2017-06-09T17:22:58Z
    date available2017-06-09T17:22:58Z
    date copyright2005/11/01
    date issued2005
    identifier issn0739-0572
    identifier otherams-84187.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4227495
    description abstractIn this two-part paper, a correction for rain attenuation of radar reflectivity (ZH) and differential reflectivity (ZDR) at the X-band wavelength is presented. The correction algorithm that is used is based on the self-consistent method with constraints proposed by Bringi et al., which was originally developed and evaluated for C-band polarimetric radar data. The self-consistent method is modified for the X-band frequency and is applied to radar measurements made with the multiparameter radar at the X-band wavelength (MP-X) operated by the National Research Institute for Earth Science and Disaster Prevention (NIED) in Japan. In this paper, characteristic properties of relations among polarimetric variables, such as AH?KDP, ADP?AH, AH?ZH, and ZDR?ZH, that are required in the correction methodology are presented for the frequency of the MP-X radar (9.375 GHz), based on scattering simulations using drop spectra measured by disdrometers at the surface. The scattering simulations were performed under conditions of three different temperatures and three different relations for drop shapes, in order to consider variability of polarimetric variables for these conditions. For the X-band wavelength, the AH?KDP and ADP?AH relations can be assumed to be nearly linear. The coefficient α of the AH?KDP relation varies over a wide range from 0.139 to 0.335 dB (°)?1 with a mean value of 0.254 dB (°)?1. The coefficient ? of the ADP?AH relation varies from 0.114 to 0.174, with a mean value of 0.139. The exponent b of the AH?ZH relation does not depend on drop shapes and is almost constant for a given temperature (about 0.78 at the temperature of 15°C). The ZDR?ZH relation depends primarily on drop shape, and does not vary with temperature.
    publisherAmerican Meteorological Society
    titleCorrection of Radar Reflectivity and Differential Reflectivity for Rain Attenuation at X Band. Part I: Theoretical and Empirical Basis
    typeJournal Paper
    journal volume22
    journal issue11
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH1803.1
    journal fristpage1621
    journal lastpage1632
    treeJournal of Atmospheric and Oceanic Technology:;2005:;volume( 022 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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