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    Bulk-Density Representations of Branched Planar Ice Crystals: Errors in the Polarimetric Radar Variables

    Source: Journal of Applied Meteorology and Climatology:;2017:;volume 057:;issue 002::page 333
    Author:
    Schrom, Robert S.
    ,
    Kumjian, Matthew R.
    DOI: 10.1175/JAMC-D-17-0114.1
    Publisher: American Meteorological Society
    Abstract: AbstractRecent interest in interpreting polarimetric radar observations of ice and evaluating microphysical model output with these observations has highlighted the importance of accurately computing the scattering of microwave radiation by branched planar ice crystals. These particles are often represented as spheroids with uniform bulk density, reduced from that of solid ice to account for the complex, nonuniform structure of natural branched crystals. In this study, the potential errors that arise from this assumption are examined by comparing scattering calculations of branched planar crystals with those of homogeneous, reduced-density plate crystals and spheroids with the same mass, aspect ratio, and maximum dimension. The results show that this assumption leads to significant errors in backscatter cross sections at horizontal and vertical polarization, specific differential phase (KDP), and differential reflectivity (ZDR), with the largest ZDR errors for ice crystals with the most extreme aspect ratios (<0.01) and effective densities < 250 kg m?3. For example, the maximum errors in X-band ZDR are 4.5 dB for 5.6-mm branched planar crystals. However, substantial errors are present at all weather radar frequencies, with resonance scattering effects at Ka and W band amplifying the low-frequency errors. The implications of these results on the interpretation of polarimetric radar observations and forward modeling of the polarimetric radar variables from microphysical model output are discussed.
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      Bulk-Density Representations of Branched Planar Ice Crystals: Errors in the Polarimetric Radar Variables

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    contributor authorSchrom, Robert S.
    contributor authorKumjian, Matthew R.
    date accessioned2019-09-19T10:06:18Z
    date available2019-09-19T10:06:18Z
    date copyright10/31/2017 12:00:00 AM
    date issued2017
    identifier otherjamc-d-17-0114.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261577
    description abstractAbstractRecent interest in interpreting polarimetric radar observations of ice and evaluating microphysical model output with these observations has highlighted the importance of accurately computing the scattering of microwave radiation by branched planar ice crystals. These particles are often represented as spheroids with uniform bulk density, reduced from that of solid ice to account for the complex, nonuniform structure of natural branched crystals. In this study, the potential errors that arise from this assumption are examined by comparing scattering calculations of branched planar crystals with those of homogeneous, reduced-density plate crystals and spheroids with the same mass, aspect ratio, and maximum dimension. The results show that this assumption leads to significant errors in backscatter cross sections at horizontal and vertical polarization, specific differential phase (KDP), and differential reflectivity (ZDR), with the largest ZDR errors for ice crystals with the most extreme aspect ratios (<0.01) and effective densities < 250 kg m?3. For example, the maximum errors in X-band ZDR are 4.5 dB for 5.6-mm branched planar crystals. However, substantial errors are present at all weather radar frequencies, with resonance scattering effects at Ka and W band amplifying the low-frequency errors. The implications of these results on the interpretation of polarimetric radar observations and forward modeling of the polarimetric radar variables from microphysical model output are discussed.
    publisherAmerican Meteorological Society
    titleBulk-Density Representations of Branched Planar Ice Crystals: Errors in the Polarimetric Radar Variables
    typeJournal Paper
    journal volume57
    journal issue2
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-17-0114.1
    journal fristpage333
    journal lastpage346
    treeJournal of Applied Meteorology and Climatology:;2017:;volume 057:;issue 002
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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