Japan Geoscience Union Meeting 2023

Presentation information

[E] Online Poster

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS13] Marine ecosystems and biogeochemical cycles: theory, observation and modeling

Wed. May 24, 2023 3:30 PM - 5:00 PM Online Poster Zoom Room (1) (Online Poster)

convener:Shin-ichi Ito(Atmosphere and Ocean Research Institute, The University of Tokyo), Takafumi Hirata(Arctic Research Center, Hokkaido University), Eileen E Hofmann(Old Dominion University), Jessica A. Bolin(University of the Sunshine Coast)


On-site poster schedule(2023/5/24 17:15-18:45)

3:30 PM - 5:00 PM

[AOS13-P08] Future Projection of Physical-Biogeochemical Environment in the Deep Japan Sea

*Tianran Liu1, Naoki Hirose1, Katsumi Takayama2 (1.Research Institute for Applied Mechanics, Kyushu University, 2.Institute of Environmental Informatics, IDEA Consultants, Inc.)

Keywords:global warming, Japan Sea, physical-biogeochemical coupled model, Green’s function method

We attempt to create a physical-biogeochemical coupled model and predict the environment in the deep Japan Sea under global warming scenarios. The representation of physical-biogeochemical variations is improved by adjusting the model parameters and initial conditions based on the Green’s function method and WOD18 data. The root-mean-square differences of simulation with optimal parameters decrease by 37% for dissolved oxygen (DO) and 11% for nutrient (N). Then, the prediction experiments extended to 150 more years show that the deep layer temperature increases abruptly under RCP8.5 scenario after 100 years from now. On the other hand, the concentration of DO decreases by a rate of 0.67 μmol/kg, and N increases by a rate of 0.08 mmol/m3 for RCP2.6 (RCP8.5) scenario until 2090 (2120). After that, the concentrations become unstable. It is noted that the DO concentration of RCP8.5 scenario is much higer than that of RCP2.6 in the 22nd century.