2003 Fiscal Year Final Research Report Summary
Studies on the extra-tropical transition of typhoons and accompanied meteorological hazards due to meso-scale disturbances
| Project/Area Number |
14380202
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Natural disaster science
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
ISHIKAWA Hirohiko Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (60263159)
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| Co-Investigator(Kenkyū-buntansha) |
UEDA Hiromasa Kyoto University, Disaster Prevention Research Institute, Professor, 防災研究所, 教授 (70026186)
HAYASHI Tai-ichi Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (10111981)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Typhoon / Extra-tropical cyclone / Weather forecast / Numerical model / MM5 / Severe storm |
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| Research Abstract |
Typhoons originated in the western pacific ocean. Several of them migrate to the north and cause various hazard in Japanese Islands.. When a typhoon migrates to the north, it interact with the mid-latitudes baroclinic environments and change it structure. This deformation process is called extratropical transition. In the cource of extratropical transition various meso-scale systems developes, which act as a major cause of meteorological hazard.
As for T9807(Vicki) which caused serious wind damages in the Kinki district, especially in the Nara Baisin, its surface structure was closely investigated using surface meteorological data collected from fire stations(128 stations). At the most of stations, the highest wind took place after the passage of the typhoon center at its rear side. A comparison with data echoes shows that high wind events took place around a rain band formed to the rear of the typhoon center. This case was also simulated with a Meso-scale Meteorological Model, PSU NCAR MM5, and the formation of the rain band and the associated strong wind were reproduced by the model simulation.
For T9918(Bart) which caused storm serege at the western Japan and also caused tornadic storm at the Pacific coast of central Japan, a suit of numerical simulation was conducted in var4ious resolution. The tronadic storm and the environment in the typhoon circulation were closely examined based on the fine mesh simulation. The entire history of the typhoon including its remarkable reontensification were reproduced by regional scale simulations and the dynamics in the process of extra-tropical transition is dignosed using the simulated results.
Autumn typhoons sometimes accompany meso-β scale disturbance, termed as the pressure dip, the typhoon circulation. The climatological features and the structure of this disturbance were examined. This was also simulated by the MM5 and the detailed structure and the cause of this disturbance were analyzed.
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Research Products
(11 results)
