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  1. 防災科研関係論文

Transition Process from Non-Precipitating Cumuli to Precipitating Convective Clouds over Mountains: Observation by Ka-band Doppler Radar and Stereo Photogrammetry

https://nied-repo.bosai.go.jp/records/5522
https://nied-repo.bosai.go.jp/records/5522
5f0b4a4a-8481-4559-a826-e2e024849e49
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Transition Process from Non-Precipitating Cumuli to Precipitating Convective Clouds over Mountains: Observation by Ka-band Doppler Radar and Stereo Photogrammetry
言語
言語 eng
著者 Ryohei Misumi

× Ryohei Misumi

en Ryohei Misumi

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Namiko Sakurai

× Namiko Sakurai

en Namiko Sakurai

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Takeshi Maesaka

× Takeshi Maesaka

en Takeshi Maesaka

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Shin-ichi Suzuki

× Shin-ichi Suzuki

en Shin-ichi Suzuki

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Shingo Shimizu

× Shingo Shimizu

en Shingo Shimizu

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Koyuru Iwanami

× Koyuru Iwanami

en Koyuru Iwanami

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抄録
内容記述タイプ Other
内容記述 Convective storms are frequently initiated over mountains under weak synoptic forcing conditions. However, the initiation process of such convective storms is not well understood due to a lack of observations, especially the transition process from non-precipitating cumuli to precipitating convective clouds. To investigate the initiation process, we conducted observations around the mountains in the Kanto region, Japan on 18 August 2011 using a 35 GHz (Ka-band) Doppler radar and a pair of digital cameras. The evolution of convective clouds was classified into three stages: convective clouds visible but not detected by the Ka-band radar (stage 0), convective clouds detectable by the Ka-band radar with reflectivity below 15 dBZ (stage 1), and convective clouds accompanied by descending echoes corresponding to precipitation (stage 2). During the transition process from stage 1 to stage 2, weak radar echoes rose to the higher level and reflectivity rapidly increased. This phenomenon suggests that drizzle particles produced in a preexisting convective cloud were lifted by a newly developed updraft, and raindrops were formed rapidly by coalescence of the drizzle particles and cloud droplets. This hypothetical process explains the precipitation echo formation in the lower layer frequently observed in the mountainous area in the Kanto region.
言語 en
書誌情報 en : JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN

巻 96A, p. 51-66, 発行日 2018
出版者
言語 en
出版者 METEOROLOGICAL SOC JAPAN
ISSN
収録物識別子タイプ EISSN
収録物識別子 2186-9057
DOI
関連識別子 10.2151/jmsj.2017-021
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