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    Intercomparison of Attenuation Correction Methods for the GPM Dual-Frequency Precipitation Radar

    Source: Journal of Atmospheric and Oceanic Technology:;2015:;volume( 032 ):;issue: 005::page 915
    Author:
    Seto, Shinta
    ,
    Iguchi, Toshio
    DOI: 10.1175/JTECH-D-14-00065.1
    Publisher: American Meteorological Society
    Abstract: new attenuation correction method has been developed for the dual-frequency precipitation radar (DPR) on the core satellite of the Global Precipitation Measurement (GPM) mission. The new method is based on Hitschfeld and Bordan?s attenuation correction method (HB method), but the relationship between the specific attenuation k and the effective radar reflectivity factor Ze (k?Ze relationship) is modified by using the dual-frequency ratio (DFR) of Ze and the surface reference technique (SRT). Therefore, the new method is called the HB-DFR-SRT method (H-D-S method). The previous attenuation correction method, called the HB-DFR method (H-D method), results in an underestimation of precipitation rates for heavy precipitation, but the H-D-S method mitigates the negative bias by means of the SRT. When only a single-frequency measurement is available, the H-D-S method is identical to the HB-SRT method (H-S method).The attenuation correction methods were tested with a simple synthetic DPR dataset. As long as the SRT gives perfect estimates of path-integrated attenuation and the adjustment factor of the k?Ze relationship (denoted by ε) is vertically constant, the H-S method is much better than the dual-frequency methods. Tests with SRT error and vertical variation in ε showed that the H-D method was better than the H-S method for weak precipitation, whereas the H-S method was better than the H-D method for heavy precipitation. The H-D-S method did not produce the best results for both weak and heavy precipitation, but the results are stable. Quantitative evaluation should be done with real DPR measurement datasets.
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      Intercomparison of Attenuation Correction Methods for the GPM Dual-Frequency Precipitation Radar

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4228515
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    • Journal of Atmospheric and Oceanic Technology

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    contributor authorSeto, Shinta
    contributor authorIguchi, Toshio
    date accessioned2017-06-09T17:25:48Z
    date available2017-06-09T17:25:48Z
    date copyright2015/05/01
    date issued2015
    identifier issn0739-0572
    identifier otherams-85104.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4228515
    description abstractnew attenuation correction method has been developed for the dual-frequency precipitation radar (DPR) on the core satellite of the Global Precipitation Measurement (GPM) mission. The new method is based on Hitschfeld and Bordan?s attenuation correction method (HB method), but the relationship between the specific attenuation k and the effective radar reflectivity factor Ze (k?Ze relationship) is modified by using the dual-frequency ratio (DFR) of Ze and the surface reference technique (SRT). Therefore, the new method is called the HB-DFR-SRT method (H-D-S method). The previous attenuation correction method, called the HB-DFR method (H-D method), results in an underestimation of precipitation rates for heavy precipitation, but the H-D-S method mitigates the negative bias by means of the SRT. When only a single-frequency measurement is available, the H-D-S method is identical to the HB-SRT method (H-S method).The attenuation correction methods were tested with a simple synthetic DPR dataset. As long as the SRT gives perfect estimates of path-integrated attenuation and the adjustment factor of the k?Ze relationship (denoted by ε) is vertically constant, the H-S method is much better than the dual-frequency methods. Tests with SRT error and vertical variation in ε showed that the H-D method was better than the H-S method for weak precipitation, whereas the H-S method was better than the H-D method for heavy precipitation. The H-D-S method did not produce the best results for both weak and heavy precipitation, but the results are stable. Quantitative evaluation should be done with real DPR measurement datasets.
    publisherAmerican Meteorological Society
    titleIntercomparison of Attenuation Correction Methods for the GPM Dual-Frequency Precipitation Radar
    typeJournal Paper
    journal volume32
    journal issue5
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH-D-14-00065.1
    journal fristpage915
    journal lastpage926
    treeJournal of Atmospheric and Oceanic Technology:;2015:;volume( 032 ):;issue: 005
    contenttypeFulltext
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    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian