Observational and numerical study on roles of convective activity in tropical cyclone formation and rapid intensification

• Project/Area Number: 22740308
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Tohoku University
• Principal Investigator: SAWADA Masahiro 東北大学, 大学院・理学研究科, 助教 (90466524)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 気象 / 台風 / 減災 / 数値シミュレーション / 急発達

Research Abstract

It is found strong low-level cyclonic circulation is formed before rapid intensification of tropical cyclone from reanalysis data. Through numerical simulations on periodic variation of tropical cyclone precipitation, we clarify the periodic behavior is caused by rainband formation and propagation, which leads to the intensity and secondary circulation variation. It is indicated higher resolution simulation is key factor for reproducing rapid intensification.

Research Products

• [Journal Article] Transient Downslope Winds under the Influence of Stationary Lee Waves from the Zao Mountain Range (2012)
  • Author(s): Masahiro Sawada, Toshiki. Iwasaki, et al (9名、1番目)
  • Journal Title: J. Meteorol. Soc. Japan Volume: 90 Pages: 79-100
  • NAID: 40019166753
  • Peer Reviewed
• [Journal Article] Transient Downslope Winds under the Influence of Stationary Lee Waves from the Zao Mountain Range (2012)
  • Author(s): Masahiro SAWADA
  • Journal Title: Journal of the Meteorological Society of Japan. Ser. II Volume: 90 Issue: 1 Pages: 79-100
  • DOI: 10.2151/jmsj.2012-105
  • NAID: 130004435145
  • ISSN: 0026-1165, 2186-9057
  • Peer Reviewed
• [Presentation] Roles of Cloud Microphysics for Tropical Cyclone Development (2012)
  • Author(s): Masahiro SAWADA
  • Organizer: TYPHOON WORKSHOP 2012 in OKINAWA
  • Place of Presentation: 琉球大学研究者交流施設(沖縄県)
  • Year and Date: 2012-01-21
• [Presentation] 台風に伴う対流活動の周期的な変動メカニズム (2011)
  • Author(s): 沢田雅洋
  • Organizer: 日本気象学会2011年度秋季大会
  • Place of Presentation: 名古屋大学(愛知県)
  • Year and Date: 2011-11-16
• [Presentation] Mechanism for temporal variation of convective activity associated with Tropical Cyclone using a Cloud Resolving Simulation (2011)
  • Author(s): Masahiro SAWADA
  • Organizer: The Fifth Korea-Japan-China Joint Conference on Meteorology
  • Place of Presentation: Busan Exhibition and Convention Center (韓国)
  • Year and Date: 2011-10-24
• [Presentation] A study on the sensitivity of the simulated intensification of Typhoon Megi (2010) to planetary boundary layer schemes : An Energy Budget Analysis (2011)
  • Author(s): Rochelle Coronell
  • Organizer: The Fifth Korea-Japan-China Joint Conference on Meteorology
  • Place of Presentation: Busan Exhibition and Convention Center(韓国)
  • Year and Date: 2011-10-24
• [Presentation] 台風に伴う対流活動の周期的変動に関する数値実験 (2011)
  • Author(s): 沢田雅洋
  • Organizer: 第13回非静力学モデルに関するワークショップ
  • Place of Presentation: 長岡技術科学大学(新潟県)
  • Year and Date: 2011-10-13
• [Presentation] Diurnal variation of precipitation associated with tropical cyclone and its structure change (2011)
  • Author(s): Masahiro Sawada, T. Iwasaki
  • Organizer: IUGG-2011
  • Place of Presentation: Australia
  • Year and Date: 2011-07-02
• [Presentation] Diurnal variation of precipitation associated with tropical cyclone and its structure change (2011)
  • Author(s): Masahiro SAWADA
  • Organizer: XXV International Union of Geodesy and Geophysics (IUGG) General Assembly
  • Place of Presentation: Melbourne Convention & Exhibition Centre (オーストラリア)
  • Year and Date: 2011-07-02
• [Presentation] 台風の強度予報に関する数値実験 (2011)
  • Author(s): 沢田雅洋
  • Organizer: 超高精度メソスケール気象予測研究会
  • Place of Presentation: 計算科学研究機構講堂(兵庫県)
  • Year and Date: 2011-06-03
• [Presentation] 台風に伴う雲・降水日変動の要因と放射の役割 (2011)
  • Author(s): 沢田雅洋
  • Organizer: 日本気象学会2011年度春季大会
  • Place of Presentation: 国立オリンピック記念青少年総合センター(東京都)
  • Year and Date: 2011-05-21
• [Presentation] Diurnal variation of precipitation associated with tropical cyclone and its structural change (2010)
  • Author(s): Masahiro SAWADA
  • Organizer: The 2nd China-Japan Joint Workshop on Air-Sea-Land Interactions (ASLI)
  • Place of Presentation: Sun Yat-sen University(中国)
  • Year and Date: 2010-11-05
• [Presentation] 台風に伴う降水の日変動と強度変化について (2010)
  • Author(s): 沢田雅洋
  • Organizer: 日本気象学会2010年度秋季大会
  • Place of Presentation: 京都テルサ(京都府)
  • Year and Date: 2010-10-27
• [Presentation] On the diurnal variation of precipitation associated with tropical cyclone and its intensity (2010)
  • Author(s): Masahiro SAWADA
  • Organizer: First International Workshop on Nonhydrostatic Numerical Models
  • Place of Presentation: 京都大学国際交流セミナーハウス(京都府)
  • Year and Date: 2010-09-30
• [Presentation] Impacts of melting/evaporative cooling on tropical cyclone development and structure (2010)
  • Author(s): Masahiro SAWADA
  • Organizer: Center for Climate System Eesearch seminar
  • Place of Presentation: 東京大学大気海洋研究所(千葉県)
  • Year and Date: 2010-06-02
• [Presentation] Impacts of evaporative cooling on tropical cyclone rainband (2010)
  • Author(s): Masahiro Sawada, T. Iwasaki
  • Organizer: 29th Conference on Hurricanes and Tropical Meteorology
  • Place of Presentation: U. S.
  • Year and Date: 2010-05-12