Development of water isotope incorporated Earth System Model and first Euro-Japan inter comparison

2020 Fiscal Year Annual Research Report

• Project/Area Number: 19F19024
• Research Institution: The University of Tokyo
• Principal Investigator: 芳村 圭 東京大学, 生産技術研究所, 教授 (50376638)
• Co-Investigator(Kenkyū-buntansha): CAUQUOIN ALEXANDRE 東京大学, 生産技術研究所, 外国人特別研究員
• Project Period (FY): 2019-10-11 – 2022-03-31
• Keywords: Water isotopes / GCM / paleoclimate / MIROC / inter-comparison

Outline of Annual Research Achievements

After having get used to the different isotopic models available in our team (MIROC5-iso for the atmosphere/land, COCO-iso for the ocean), we decided to split the technical work between the team members (IIS and Hirosaki University) to begin the implementation of water isotopes in all compartments of the coupled model MIROC6. I successfully implemented the water isotopes in the last version of the oceanic model COCO, in both the ocean and the sea ice. The model is currently running for spin-up (objective of 2000/3000 model years) in order to have proper initial conditions of isotopes in ocean for the coupled setup.
We also began a home-made isotopic inter-comparisons project, in the purpose to provide isotopic simulation outputs from different models to the climate community and to compare the skills of the models to represent water isotopes. For the moment, isotope-enabled simulations with the Japanese models MIROC5-iso and IsoGSM, nudged to JRA55 reanalyses for period 1979-2020, have been produced.

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

The implementation of isotopes in COCO was smooth and we did not meet major difficulties to produce of the necessary simulation for the isotopic model inter-comparison project.

Strategy for Future Research Activity

The technical and scientific plan for this fiscal year is as follows:
- implementation of water stable isotopes in all compartments of MIROC6: the last version of the oceanic model COCO with water isotope diagnostics in ocean and sea ice is currently running for spin-up. The update from the version 5 to 6 of atmosphere model MIROC-iso will be the main work for this fiscal year, as well as the coupling of isotope fields between MIROC and COCO.
- isotopic inter-comparisons project: The same simulation produced with MIROC5-iso and IsoGSM model will be performed with the German model ECHAM6-wiso in the coming months. The models inter-comparison, made by a PhD student at the Yoshimura Lab, is planned for this fiscal year with a potential publication in a high-ranked journal.
- Related to the Euro-Japanese collaboration, the simulation of the last 2000 year with the German isotope-enabled coupled model MPI-ESM-wiso has been performed in the framework of PMIP4 (Paleoclimate Modelling Intercomparison Project, 4th phase). The (isotope) model results will be used for data assimilation thanks to the skills of researchers at Yoshimura Lab (IIS). The objective is to reconstruct the climate variations of the last 2000 years, like surface temperature. A potential publication in a high-ranked journal is expected in the future.

Research Products

• [Journal Article] Oxygen and hydrogen isotopic composition of tap waters in France (2021)
  • Author(s): Daux Valerie、Minster B.、Cauquoin A.、Jossoud O.、Werner M.、Landais A.
  • Journal Title: Geological Society, London, Special Publications Volume: 507 Pages: 47-61
  • DOI: 10.1144/SP507-2020-207
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Water stable isotopes changes in PMIP-type paleoclimate simulations from the fully coupled model MPI-ESM-wiso (2020)
  • Author(s): Cauquoin, A., Werner, M. and Lohmann, G.
  • Organizer: PMIP 2020
• [Presentation] High-resolution isotopic simulations from ECHAM6-wiso nudged with ERA5 reanalyses: new products for isotopic model-data comparisons (2020)
  • Author(s): Cauquoin, A. and Werner, M.
  • Organizer: EGU 2020
• [Presentation] Investigation of the response of water isotope records to the changes in orbital forcing with the isotope-enabled AGCM MIROC5-iso (2020)
  • Author(s): Kino, K., Okazaki, A., Cauquoin, A. and Yoshimura, K.
  • Organizer: EGU 2020
• [Presentation] Sensitivity of isotopes in the hydrological cycle to simulated vs. reconstructed Last Glacial Maximum surface conditions (2020)
  • Author(s): Paul, A., Werner, M., Cauquoin, A., Garcia-Pintado, J., Merkel, U. and Tharammal, T.
  • Organizer: EGU 2020
• [Presentation] A Nine-year series of daily oxygen and hydrogen isotopic composition of precipitation at Concordia station, East Antarctica (2020)
  • Author(s): Stenni, B., Dreossi, G., Casado, M., Scarchilli, C., Landais, A., Del Guasta, M., Grigioni, P., Casasanta, G., Werner, M., Masiol, M., Cauquoin, A. and Ciardini, V.
  • Organizer: EGU 2020
• [Presentation] Key controls of water vapour isotopes during oceanic evaporation and their global impact (2020)
  • Author(s): Werner, M., Bonne, J.-L., Cauquoin, A. and Steen-Larsen, H. C.
  • Organizer: EGU 2020
• [Presentation] LGM simulation with MIROC5-iso and impacts of the synoptic scale events on stable water isotopes in the Antarctic ice cores (2020)
  • Author(s): Kino, K., Okazaki, A., Cauquoin, A., and Yoshimura, K.
  • Organizer: PMIP 2020
• [Presentation] Transient Holocene simulations compared to deep sea cores in the Indian ocean (2020)
  • Author(s): Marti, O., Bassinot, F., Braconnot, P., Jungclaus, J., Cauquoin, A., Lohmann, G., Shi, X. and Werner, M.
  • Organizer: PMIP 2020
• [Presentation] Simulated vs. reconstructed Last Glacial Maximum surface conditions: impact on oxygen isotopes in ice cores, speleothems and precipitation (2020)
  • Author(s): Paul, A., Werner, M., Cauquoin, A., Garcia-Pintado, J., Kovacs, T., Merkel, U. and Tharammal, T.
  • Organizer: AGU 2020