[A-CG40] Dynamics of Oceanic and Atmospheric Waves, Vortices, and Circulations

[ACG40-P05] Visualization and validation of SWOT observation data around Oki Islands and Hamada.

*Hitoshi Arimura¹, Shinichiro Kida² (1.Department of Earth System Science, Interdisciplinary Graduate School of Engineering Science, Kyushu University, 2.Research Institute for Applied Mechanics, Kyushu University)

Keywords:SWOT, Sea-surface height, Remote sensing

Sea-surface height (SSH) around the Oki Islands and Hamada, Shimane Prefecture, was visualized, and verified using data obtained from the SWOT satellite, a new-generation ocean altimetry satellite.The SWOT satellite measures SSH in two dimensions using synthetic aperture radar and is capable of observing the ocean in high-resolution including coastal areas and rivers.We focused on the area around the Oki Islands, where two orbits passing over Japan intersect during the period from April to July 2024.This period is also when high-frequency data is available.We also compared SSH observed by SWOT with that observed at a tide station in Hamada, Shimane Prefecture.Visualization of SSH over a wide area from offshore to coastal areas around the Oki Islands showed a mesoscale eddy developing in the offshore area about 180 km from the coast. In addition, we were able to capture the increasing trend of SSH towards the summer.While SWOT values showed similar long-term temporal variations compared to the tide station data, some bias exists.In the future, we plan to conduct a more detailed accuracy validation of these results by considering the effects of tides and other factors.