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  1. 防災科研関係論文

Polarimetric Radar Observation of the Melting Layer in a Convective Rainfall System during the Rainy Season over the East China Sea

https://nied-repo.bosai.go.jp/records/4962
https://nied-repo.bosai.go.jp/records/4962
38d41b85-884e-414f-97ee-94c27c5a2fc6
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Polarimetric Radar Observation of the Melting Layer in a Convective Rainfall System during the Rainy Season over the East China Sea
言語
言語 eng
著者 Yukari Shusse

× Yukari Shusse

en Yukari Shusse

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Nobuhiro Takahashi

× Nobuhiro Takahashi

en Nobuhiro Takahashi

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Katsuhiro Nakagawa

× Katsuhiro Nakagawa

en Katsuhiro Nakagawa

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Shinsuke Satoh

× Shinsuke Satoh

en Shinsuke Satoh

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Toshio Iguchi

× Toshio Iguchi

en Toshio Iguchi

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抄録
内容記述タイプ Other
内容記述 During the rainy season over the East China Sea, convective rainfalls often show melting layer (ML) characteristics in polarimetric radar variables. In this research, the appearance ratio of the ML (the ratio of rainfall area accompanied by polarimetric ML signatures) and the variation in height of the level of the ML signature maximum (MLSM level; defined by the level of the rho(hv) minimum in the ML) in a convective rainfall region in a rainfall system over the East China Sea observed on 2 June 2006 were studied using C-band polarimetric radar (COBRA). For this analysis, a method of rainfall type classification that evaluates the presence of an ML in addition to providing conventional convective-stratiform classification using range height indicator (RHI) observation data was developed. This rainfall type classification includes two steps: conventional convective-stratiform separation using the horizontal distribution of Z(h) at 2-km altitude, and ML detection using the vertical profile of rho(hv) at each horizontal grid point. Using a combination of these two classifications, the following four rainfall types were identified: 1) convective rainfall with an ML, 2) convective rainfall with no ML, 3) stratiform rainfall with an ML, and 4) stratiform rainfall with no ML. An ML was detected in 53.9% of the convective region in the rainfall system. Using the same definition, an ML was detected in 83.1% of the stratiform region. The ML in the convective region showed a marked decrease in rho(hv) coincident with an increase in Z(DR) around the ambient 0 degrees C level, as did that in the stratiform region. Melting aggregated snow was the likely cause of the ML signature in the convective region. The average height of the MLSM level in the convective region was 4.64 km, which is 0.46 km higher than that in the stratiform region (4.18 km) and 0.27 km higher than the ambient 0 degrees C level (4.37 km).
言語 en
書誌情報 en : JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY

巻 50, 号 2, p. 354-367, 発行日 2011-02
出版者
言語 en
出版者 AMER METEOROLOGICAL SOC
ISSN
収録物識別子タイプ ISSN
収録物識別子 1558-8424
DOI
関連識別子 10.1175/2010JAMC2469.1
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