Sensitivity analysis on the formation of secondary eyewall

• Project/Area Number: 26800250
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: University of the Ryukyus
• Principal Investigator: Ito Kosuke 琉球大学, 理学部, 助教 (10634123)
• Research Collaborator: Takuya Kawabata 気象研究所, 予報研究部, 主任研究官 (80354447)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 台風強度 / 感度解析 / 台風 / 壁雲

Outline of Final Research Achievements

Tropical cyclones are often highly destructive. In this work, sensitivity analysis with a high-resolution nonhydrostatic atmospheric model and its adjoint model is conducted to elucidate the important factors on typhoon Bolaven's secondary eyewall formation (SEF) that influenced the rapid change of its intensity. As a result, the SEF is shown to be sensitive to a humidity profile in the lower atmosphere outside of the SEF region. The impact is verified by additional numerical experiments. These results are presented in several conferences such as American Meteorological Society Hurricane Conference.

Research Products

• [Journal Article] 多重壁雲形成機構に関する感度解析 (2015)
  • Author(s): 伊藤耕介
  • Journal Title: 台風研究連絡会報告書 Volume: 0 Pages: 84-87
  • Acknowledgement Compliant
• [Journal Article] Recent Progress of the NHM-4DVAR towards a Super-High Resolution Data Assimilation (2014)
  • Author(s): Takuya Kawabata, Kosuke Ito, and Kazuo Saito
  • Journal Title: SOLA Volume: 10 Issue: 0 Pages: 145-149
  • DOI: 10.2151/sola.2014-030
  • NAID: 130004694330
  • ISSN: 1349-6476
  • Peer Reviewed / Open Access
• [Presentation] Secondary eyewall formation fueled by outer convective instability (2016)
  • Author(s): Kosuke Ito
  • Organizer: 13th Annual meeting for Asia Oceania Geosciences Society
  • Place of Presentation: China National Convention Centre, Beijing, China
  • Year and Date: 2016-07-31
  • Int'l Joint Research
• [Presentation] Secondary eyewall formation fueled by a lower convective instability (2016)
  • Author(s): Kosuke Ito and Chun-Chieh Wu
  • Organizer: Hurricane Conference
  • Place of Presentation: Condado Hilton Plaza, San Juan, Puerto Rico
  • Year and Date: 2016-04-19
  • Int'l Joint Research
• [Presentation] 多重壁雲形成機構に関する感度解析 (2015)
  • Author(s): 伊藤耕介
  • Organizer: 平成27年度台風研究会
  • Place of Presentation: 京都大学防災研究所，京都
  • Year and Date: 2015-11-01
• [Presentation] Increase of maximum tangential velocity in a hurricane as a sequence of cause and effect (2014)
  • Author(s): Kosuke Ito
  • Organizer: ICMCS-X
  • Place of Presentation: Boulder, Corolado
  • Year and Date: 2014-09-15
• [Book] 台風の正体 (2014)
  • Author(s): 筆保弘徳、伊藤耕介、山口宗彦
  • Total Pages: 175
  • Publisher: 朝倉出版