Study of the initial disturbance of tropical cyclone and its development over the Western Pacific

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400475
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: NASUNO Tomoe 国立研究開発法人海洋研究開発機構, シームレス環境予測研究分野, 主任研究員 (20358766)
• Co-Investigator(Renkei-kenkyūsha): YAMADA Hiroyuki 琉球大学, 理学部, 准教授 (30421879) ; SAWADA Masahiro 気象庁気象研究所, 台風研究部, 研究官 (90466524) ; KUBOTA Hisayuki 東京大学, 大気海洋研究所, 特任研究員 (40359211) ; NAKANO Masuo 国立研究開発法人海洋研究開発機構, ビッグデータ活用予測プロジェクトチーム, 特任技術研究員 (40713954)
• Research Collaborator: KIKUCHI Kazuyoshi 国際太平洋研究センター, Assistant Researcher ; LI Tim ハワイ大学, 国際太平洋研究センター, 教授 ; WANG Yuqing ハワイ大学, 国際太平洋研究センター, 教授
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 台風発生過程 / 西太平洋 / アジアモンスーン / 季節内振動 / 全球非静力学モデル

Outline of Final Research Achievements

The genesis process of tropical cyclones (TCs) over the Western Pacific is related to a wide range of variabilities including large-scale (several thousands of kilometers) phenomena, such as Asian monsoon and intraseasonal oscillation, as well as the eye wall clouds (several tens of kilometers) that constitute the inner core of the TCs. In order to gain our understanding of the multiscale interactions in the TC formation, a series of high-resolution numerical experiments using a global nonhydrostatic model was conducted for a TC case of June 2008, and the roles of the large-scale variability was investigated. It was found that the deepening of the lower tropospheric large-scale vorticity associated with the boreal summer monsoon and the active phase of the intraseasonal oscillation through the latent heat release facilitated the successive formation of deep convection around the incipient vortex of the TC, and subsequent establishment of a deep upright TC inner core.

Free Research Field

気象学