[A-OS19] Sea level rise under global warming and its impact on coastal areas

[AOS19-P02] Sea level variability and global warming response in the Northern Indian Ocean simulated in an eddy-resolving OGCM

*Yoko Yamagami¹, Tatsuo Suzuki¹, Hiroaki Tatebe¹ (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:Indian Ocean, Eddy-resolving OGCM, Sea level variability

In the densely populated coastal areas of the northern Indian Ocean, projected sea level rise increases the risks of coastal storm surges and extreme tidal events. Sea level variability along the northern Indian Ocean coast is strongly influenced by equatorial waves and the resulting coastal trapped waves. In this study, we show that the frequency of extreme local sea level events along India is linked to basin-scale climate variability. The temporal evolution of extreme event occurrence is simulated using an eddy-resolving ocean model, which highlights the role of coastal trapped wave propagation. Furthermore, we examine global warming experiments in which warming anomalies from climate model simulations are added to the surface boundary conditions. The results indicate a significant increase in eddy kinetic energy in the Bay of Bengal and the Arabian Sea. However, local sea level extremes remain largely unchanged, possibly because the experiment does not account for changes in climate variability.