| Project/Area Number |
22K20379
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0204:Astronomy, earth and planetary science, and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2022-08-31 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | tritium / MIROC / solar activity / water cycle / stratosphere / water isotopes / GCM / Fukushima |
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| Outline of Research at the Start |
The tritium is a marker for reservoirs involved in the Earth's hydrological cycle, such as the stratosphere, the troposphere and the oceans. This tracer will be added in the MIROC model, used for future climate projections, to evaluate and improve the representation of the water cycle in this model.
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| Outline of Annual Research Achievements |
The representation of the water cycle in the General Circulation Models, used for future climate projections, remains challenging. This project provides the incorporation of the tracer tritium into the MIROC model to improve the modeling of the water cycle.
After its implementation in MIROC5-iso, I published a first paper in JGR Atmos about the impact of solar activity on the water cycle and climate. Modeling of anthropogenic tritium due to nuclear bombs in the 1960s allowed me to investigate the stratosphere-troposphere exchanges. I have been invited to present this work at the IAEA Hydrology Symposium in July 2023.
I then added a societal impact aspect to my project by modeling tritium releases from Fukushima into the atmosphere and ocean. This work will be presented at the EGU 2024.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Tritium has been implemented successfully in MIROC5-iso, and a run with the tritium production depending on solar activity changes has been performed. This study has is published in an international peer-reviewed journal. I have also been invited by IAEA to present this work at an hydrology symposium in July 2023 at Vienna. 3 other studies are on the way:
- modeling of bomb-tritium to investigate stratosphere-troposphere exchanges,
- modeling of tritium rejection into the atmosphere during the Fukushima accident,
- modeling of tritium concentration into the ocean due the planned treated water release from Fukushima with the COCO4.9 model.
The 2 last studies are in collaboration with the University of Fukushima and will be presented at the EGU 2024 conference.
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| Strategy for Future Research Activity |
The results of the modeling of tritium into the atmosphere due to Fukushima accident, and into the ocean due to treated water release will be presented at the EGU 2024 conference. This extension of my initial work, thanks to new collaborations with the University of Fukushima, should lead to 2 papers submitted to international peer-reviewed journals this year and potential national and international interests.
I am also continuing to investigate stratosphere-troposphere exchanges through my bomb-tritium simulations.
The development of the coupled atmosphere-ocean isotope-enabled model MIROC6-iso is almost finished. Once this development phase finished, I will be able to adapt my tritium code for this model to get the first coupled simulation with tritium tracer.
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