[A-CG54] 有人・無人航空機による気候・地球システム科学研究の推進

[ACG54-05] Evaluation of newly developed dropsonde for aircraft observation

*金田 幸恵¹、加藤 雅也¹、坪木 和久¹、大東 忠保⁴、平野 創一朗²、清水 健作³、柳原 理沙³、吉村 飛鳥¹、後藤 悠介¹、塚越 栞奈¹ (1.名古屋大学宇宙地球環境研究所、2.京都大学、3.明星電気株式会社、4.防災科学技術研究所)

キーワード：台風、航空機観測、ドロップゾンデ、測器検証

To explore the dynamic and thermodynamic structure and intensification process of intense typhoons by aircraft observation, the Tropical cyclones–Pacific Asian Research Campaign for the Improvement of Intensity estimations/forecasts (T-PARCII) has been conducted since 2017 (Ito et al. 2018; Yamada et al. 2021). For this purpose, a novel dropsonde, the iMDS-17, has been developed by Nagoya University and Meisei Electric Co., Ltd.. The dropsonde was designed to be launched from an aircraft flying at an altitude of 13,000 m and ground speed of 720 km h^-1. Owing to their light weight of approximately 130 g, parachutes are not necessary when observing upper-air atmospheric conditions throughout the troposphere. Approximately the same technology as that of the Japan Meteorological Agency (JMA) operational radiosonde (iMS-100) was used, except that the pressure was measured directly using a pressure sensor. To evaluate the performance of the iMDS-17, intercomparison experiments were conducted on 27 and 28 March 2024 on the southern island of Japan using a balloon-borne shooter system. The dropsonde and radiosonde were lifted by the same balloon and released at altitudes between 9,000 and 13,000 m. Comparison between data obtained from the experiments confirmed the adequate performance of iMDS-17 in temperature and wind observations; maximum differences between the dropsonde and radiosonde were less than 1 K and 2 m s^-1 in temperature and wind, respectively, in most altitudes between 9-2 km. Meanwhile, a dry bias was identified for humidity, particularly in moist layers. The causes of the dry bias are discussed.
(Kanada et al. 2024, SOLA)