2023 Fiscal Year Research-status Report
Implementation of tritium in the General Circulation Model MIROC to investigate the dynamics of the hydrological cycle
| Project/Area Number |
22K20379
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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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| Keywords | tritium / MIROC / solar activity / water cycle / stratosphere / water isotopes / GCM / Fukushima |
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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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| Causes of Carryover |
The major international conferences like EGU, JpGU and GEWEX are from April 2024 (so in the next fiscal year). The remaining amount will be used in FY2024 for travel expenses at these conferences and registration fees payment.
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[Presentation] Simulation of tritium releases into the atmosphere during the Fukushima accident and into the ocean due to planned discharge of treated water2024
Author(s)
Cauquoin, A., Gusyev, M., Komuro, Y., Bong, H., Okazaki, A., and Yoshimura, K.
Organizer
10th Annual Symposium of the Institute of Environmental Radioactivity
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[Presentation] Evaluating terrestrial water cycle using numerical modeling with tritium radioisotope in Fukushima2024
Author(s)
Gusyev, M., Cauquoin, A., Igarashi, Y., Takata, H., Hirao, S., and Akata, N.
Organizer
10th Annual Symposium of the Institute of Environmental Radioactivity
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[Presentation] Anthropogenic and natural tritium radionuclide for numerical modeling of terrestrial water transit times2024
Author(s)
Gusyev, M., Cauquoin, A., Igarashi, Y., Takata, H., Hirao, S., Akata, N., and Shibasaki, N.
Organizer
10th Annual Symposium of the Institute of Environmental Radioactivity
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[Presentation] Simulation of tritium releases into the atmosphere during the Fukushima accident and into the ocean due to planned discharge of treated water2024
Author(s)
Cauquoin, A., Gusyev, M., Komuro, Y., Bong, H., Okazaki, A., and Yoshimura, K.
Organizer
EGU 2024
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[Presentation] Anthropogenic and natural tritium radioisotope in terrestrial water cycle of Fukushima2024
Author(s)
Gusyev, M., Cauquoin, A., Igarashi, Y., Takata, H., Hirao, S., and Akata, N.
Organizer
EGU 2024
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[Presentation] Effects of LGM sea surface temperature and sea ice extent on the isotope-temperature slope at polar ice core sites2023
Author(s)
Cauquoin, A., Abe-Ouchi, A., Obase, T., Chan, W.-L., Paul, A. and Werner, M.
Organizer
EGU23
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[Presentation] Effects of LGM sea surface temperature and sea ice extent on the isotope-temperature slope at polar ice core sites2023
Author(s)
Cauquoin, A., Abe-Ouchi, A., Obase, T., Chan, W.-L., Paul, A. and Werner, M.
Organizer
JpGU 2023
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[Presentation] Implementation of tritium in the Atmospheric General Circulation Model MIROC5-iso to investigate the dynamics of the hydrological cycle2023
Author(s)
Cauquoin, A., Fourre, E., Landais, A., Bong, H., Okazaki, A. and Yoshimura, K.
Organizer
(IAEA) International Symposium on Isotope Hydrology: Sustainable Water Resources in a Changing World
Invited
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