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  1. 防災科研関係論文

Correction of radar reflectivity and differential reflectivity for rain attenuation at X band. Part I: Theoretical and empirical basis

https://nied-repo.bosai.go.jp/records/4972
https://nied-repo.bosai.go.jp/records/4972
be808290-780f-4cf7-8dac-8c5d869c591b
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Correction of radar reflectivity and differential reflectivity for rain attenuation at X band. Part I: Theoretical and empirical basis
言語
言語 eng
著者 S. G. Park

× S. G. Park

en S. G. Park

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V. N. Bringi

× V. N. Bringi

en V. N. Bringi

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V. Chandrasekar

× V. Chandrasekar

en V. Chandrasekar

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Masayuki Maki

× Masayuki Maki

en Masayuki Maki

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K. Iwanami

× K. Iwanami

en K. Iwanami

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抄録
内容記述タイプ Other
内容記述 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 γ 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. c 2005 American Meteorological Society.
言語 en
書誌情報 en : Journal of Atmospheric and Oceanic Technology

巻 22, 号 11, p. 1621-1632, 発行日 2005
出版者
言語 en
出版者 American Meteorological Society
ISSN
収録物識別子タイプ ISSN
収録物識別子 0739-0572
DOI
関連識別子 10.1175/JTECH1803.1
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