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Title: 台風9918号により東海地方にもたらされた竜巻に関する数値実験
Other Titles: A Numerical Simulation of the 24 September 1999 Tornadic Outbreaks in Toyohashi City Associated with Typhoon 9918
Authors: 吉野, 純  KAKEN_name
石川, 裕彦  kyouindb  KAKEN_id  orcid (unconfirmed)
植田, 洋匡  KAKEN_name
Author's alias: YOSHINO, Jun
ISHIKAWA, Hirohiko
UEDA, Hiromasa
Keywords: 竜巻
outer rainband
numerical prediction model
tornado forecast
Issue Date: 1-Apr-2002
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B
Volume: 45
Issue: B
Start page: 369
End page: 368
Abstract: 1999年9月24日に愛知県豊橋市にて発生した,台風9918号のアウターレインバンドに伴う竜巻災害に関して,領域気候モデルPSU/NCAR MM5を用いて再現実験を行った。その結果,台風の右上側象限における水平風の強い鉛直シアーと静的不安定成層により竜巻が極めて発生しやすい環境にあったことが示された。また,日本アルプスを気流が迂回することで形成された対流圏下層の局地的な水平収束シアーラインにより,積乱雲中で鉛直渦度が急激に強まる過程が,高解像度数値実験により再現された。
n 24 September 1999, tornadic events in Toyohashi City, Aichi Prefecture, Japan, spawned by typhoon 9918 (TY. BART), have been simulated using the regional climate community model PSU/NCAR MM5. The MM5 simulations successfully reproduced the observed outer rainband and mesoscale cyclones.In the tornado-prone right front quadrant relative to the typhoon motion, the vertical shear at lower troposphere (e.g. Storm Relative Environment Helicity) and thermodynamical instability (e.g.Convective Available Potential Energy) were fairly large and suitable values for developing tornado cyclones.The results of high-resolution simulation indicated the acceleration of the vertical vorticity in the mesoscale cyclone around Toyohashi City, because the mountainous region, the so-called Japan Alps, induced the low-level strong horizontal convergence shear line, due to the divided stagnant flowingaround the upstream side of the high mountains.
Appears in Collections:No.45 B

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