[A-OS18] Physical Oceanography (General)

[AOS18-06] Development of an efficient wave model and wave reanalysis around Japan

*Nadao Kohno¹, Yosuke Fujii¹, Tomoaki Sakuragi² (1.Meteorological Research Institute, JMA, 2.Information Infrastructure Department)

Keywords:ocean waves, Reanalysis, wave model

Wave information is important for the safety of voyaging ships in offshore and Disaster Risk Reductions (DRR) in coastal areas. The long-term characteristics of waves are required as basic data for coastal disaster mitigation planning or hull design. In particular, there is growing interest in the long-term trends as a part of climate change impact. To investigate the wave characteristics at coasts of Japan, wave reanalysis with a high-resolution wave model, forced by the new atmospheric reanalysis product “JRA-3Q” of the Japan Meteorological Agency (JMA).
To conduct a long-term calculation, we developed a wave model with SMC grid (Li, 2011, 2019), which is similar to unstructured grid but can efficiently run. The wave model is based on JMA wave model MRI-III, and it covers 15-55N and 115-155E with variable grid resolution from 1minute (2km) to 16 minutes (32km), considered the distance from land. We also conducted wave calculation for global area except polar regions, which gives boundary data for the regional model and global wave characteristics.
The overview of the reanalysis project and wave models, and preliminary results are presented.