Typhoon studies using high-frequency observations with the new generation meteorological satellites

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H00705
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 17:Earth and planetary science and related fields
• Research Institution: Hokkaido University
• Principal Investigator: Horinouchi Takeshi 北海道大学, 地球環境科学研究院, 教授 (50314266)
• Co-Investigator(Kenkyū-buntansha): 筆保 弘徳 横浜国立大学, 教育学部, 教授 (00435843) ; 林 昌宏 気象庁気象研究所, 台風・災害気象研究部, 研究官 (00830473) ; 嶋田 宇大 気象庁気象研究所, 台風・災害気象研究部, 主任研究官 (60750651) ; 柳瀬 亘 気象庁気象研究所, 台風・災害気象研究部, 主任研究官 (80376540)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 台風 / 気象衛星

Outline of Final Research Achievements

Tropical cyclones are of grave social interest. However, being predominantly situated over the ocean and small scaled, methods to observe them are limited. Thus, to date, most dynamical studies rely on numerical simulations. In this study, we conducted development to utilize the high-frequency observations of tropical cyclones by the third-generation geostationary meteorological satellites such as Himawari-8. We succeeded in developing new methods to estimates winds in tropical cyclones at unprecedentedly high resolution and precision. Studies by using the outcome revealed a key cloud feature for intensity estimation and elucidated the role of an algebraically growing wavenumber-1 disturbance. Further roles of asymmetric disturbances were quantified.

Free Research Field

気象学・地球流体力学

Academic Significance and Societal Importance of the Research Achievements

本研究は，これまで数値モデルによってしか行えなかった詳細な力学的な研究を，観測によって行えるようにした点で画期的である。そして，台風の強度変化をもたらす過程などについていくつもの新知見が得られた。本研究の成果は，将来的に，台風の強度・構造推定ならびに台風予報の向上につながると考えられる。