At the beginning of his career, he has developed and worked with various ocean models to simulate the ocean circulation and temperature variations. He has then actively managed an EU-Japan collaborative project to develop the SINTEX-Frontier coupled GCM for climate studies using the Earth Simulator. The SINTEX-F is a leading climate model in the world for climate predictions on seasonal-to-decadal time-scales. The predictions are used in several outreach programs for societal benefits.