| Project/Area Number |
24K03091
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 63040:Environmental impact assessment-related
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| Research Institution | Kyoto University |
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Principal Investigator |
Luce Hubert 京都大学, 生存圏研究所, 教授 (30913777)
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| Co-Investigator(Kenkyū-buntansha) |
藤原 正智 北海道大学, 地球環境科学研究院, 教授 (00360941)
橋口 浩之 京都大学, 生存圏研究所, 教授 (90293943)
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| Project Period (FY) |
2024-04-01 – 2027-03-31
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| Project Status |
Granted (Fiscal Year 2024)
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| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2026: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2025: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2024: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
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| Keywords | Turbulence detection / Instrument synergy / Direct observations / MJO impacts / turbulence / equatorial dynamics / MJO / TTL |
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| Outline of Research at the Start |
The project aims to elucidate the relationship between Madden-Julian Oscillation (MJO) events, shear-generated turbulence, and cirrus clouds in the Tropical Tropopause Layer in Indonesia using state-of-the-art in-situ turbulence and particle sensors and the VHF Equatorial Atmosphere Radar.
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| Outline of Annual Research Achievements |
The project investigates turbulence and cloud dynamics in the tropical tropopause layer (TTL), focusing on its connections to the Madden-Julian Oscillation (MJO). This is achieved through the use of VHF radar and innovative, low-cost turbulence-sensing radiosondes deployed at Kototabang, Indonesia (0.2°S, 100.3°E). The first phase of the project involved organizing and executing a field campaign from January 7-16, 2025. Despite encountering transport and handling challenges on-site, preliminary data were successfully collected, supporting the initial objectives of the study. The radiosondes provided detailed measurements of turbulence intensity and cloud microphysics, while the radar delivered continuous turbulence structure data, even with occasional interruptions. This initial phase has generated valuable insights that will inform the second phase, set to occur in January 2026. A revised publication and related communications are currently in preparation.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Despite delays in receiving equipment due to unforeseen custom problems, only 3 of the 11 planned radiosondes could not be used on site. Numerous problems, probably linked to instrument icing, have limited the amount of data obtained. In addition, the radar operated in a degraded mode due to a long-term shutdown, and is currently being refurbished. Nevertheless, the data obtained have already shed light on certain features expected of turbulence in the TTL but never directly observed until now. This first phase helped identify the issues to avoid in the second phase to be released likely in January 2026.
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| Strategy for Future Research Activity |
The second phase, planned for year 2 of the project, has been revised to take account of the results obtained in the first phase and the greater logistical and material constraints than anticipated. Instead of carrying out spaced measurements in order to sample different phases of the MJO over several years, we will organize a new campaign over a period similar to that of 2025 in order to collect data to more accurately confirm and quantify the information obtained. In particular, we plan to resolve the problems of icing on the turbulence probes and to use the radar in a more powerful mode for quantitative information on turbulence (which was not possible in the first phase).
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