University of the Ryukyus · Faculty of Science · 助教

Research fieldsEnvironmental dynamic analysis

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• Sulfate in size-segregated aerosol particles atop Mt. Fuji transported from an eruption of Sakurajima2026 · Kojiro SHIMADA, Kei SUZUKI, Shungo KATO, Syuichi ITAHASHI, Nikita KOMUTA, Shiro HATAKEYAMA
• Development of Big Data Visualization Platform Integrating Medical, Air Quality, and Meteorological Data2025 · Megumi Uza, Kang Dongsik, Mizuo Kajino, Hsiao-Chi Chuang, Tastuya Nagano, Yuji Fujitani, Ta-Chih Hsiao, Neng-Huei (George) Lin, Trần Ngọc Xuân, Kojiro Shimada
• Possibility of condensation of nitric acid for cloud condensation nucleus in the summer at Mt. Fuji2023 · Kojiro Shimada, Yoshun Geka, Shungo Kato, Chak K. Chan, Yong Pyo Kim, Chang-Feng Ou-Yang, Neng-Huei Lina, Shiro Hatakeyama
• Size-segregated sulfate on top of Mt. Fuji transported from Sakurajima volcano eruption2013 · Size-segregated aerosol samples were collected on Mt. Fuji with a cascade impactor during daytime and nighttime. We analyzed for their ionic and element compositions. Samples were collected from 29 July to 2 August (first period) and from 19 to 21 August 2013 (second period). Based on combined chemical components and CMAQ, in the first period, the air masses had been transported from East Asia. In the second period, the Sakurajima volcano eruption had been transported. NH4+, SO42–and elements were the major ions in 2.5 < Dp ≤ 10 during the second period. The slope of a linear regression of non-sea-salt (nss)-SO42– versus NH4+ was nearly unity, particularly during the first period. However, nss-SO42– in coarse aerosol was shifted in great excess in the second period. We have observed a rare phenomenon in which sulfate shifts to 2.5 < Dp ≤ 10. Although the formation process of (NH4)2SO4 in coarse particle is hypothesized two mechanisms, we hypothesize the third mechanism in this study. Currently, radiative forcing is being discussed for the detection of volcanic aerosols using satellites with particle sizes of 1.2 µm. If this can be clarified, it will improve the reproducibility of sulfate radiative forcing.

• Kobe BreathMap: Causal AI linking air pollution to acute respiratory events for decision-ready clinical support2026 · Frontiers seed funding
• 「植物の垢」と葉のワックスの光増感作用によるイソプレン発生プロセスの解明2026 · 学術変革領域研究(A)
• How AI can Deliver Meaningful Support for Neurodivergent Students in STEM Education2026 · ■■■
• 「大気環境科学」×「農業経営」で沖縄県の 窒素肥料量を最適化するスマートアグリの開発2024 · 競争的資金

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