An estimation of the upper-layer heating rate and in-situ observation of cloud ice of the typhoon-outflow layer controlling typhoon intensity

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287121
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Nagoya University
• Principal Investigator: Tsuboki Kazuhisa 名古屋大学, 宇宙地球環境研究所, 教授 (90222140)
• Co-Investigator(Kenkyū-buntansha): Uyeda Hiroshi 名古屋大学, 宇宙地球環境研究所, 教授 (80184935) ; Shinoda Taro 名古屋大学, 宇宙地球環境研究所, 准教授 (50335022) ; Ohigashi Tadayasu 名古屋大学, 宇宙地球環境研究所, 助教 (80464155) ; Yamada Hiroyuki 琉球大学, 理学部, 教授 (30421879)
• Co-Investigator(Renkei-kenkyūsha): Wakazuki Yasutaka 筑波大学, 生命環境科学研究科, 助教 (70455492) ; Nakagawa Katsuhiro 国立研究開発法人情報通信研究機構, 電磁波計測研究所, 主任研究員 (80359009)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 台風 / アウトフローレイア－ / 氷晶粒子 / 巻雲 / 雲解像モデル / 雲粒子ゾンデ / 偏波レーダ / 台風最大強度

Outline of Final Research Achievements

The maximum intensity of typhoon is largely controlled by temperature of the sea and that of the upper troposphere. The latter is determined by the heating rate in the upper troposphere, which is strongly dependent on the characteristics of cloud ice in the outflow layer extending from the typhoon center. The purpose of the present study is to clarify the characteristics of the cloud ice in the typhoon outflow layer. Shape, size and number density of cloud ice are directly observed by a balloon-borne microscope. The observation was performed in the Okinawa main island in 2013 and 2014. Two cases of typhoon were observed and characteristics of cloud ice were revealed. This result contributed to the improvement of cloud ice process of the cloud-resolving model.

Free Research Field

気象学