South China Sea Annual Meeting 2023 (SCSAM)

Strong upwelling occurred in the Southeast Arabian Sea (SEAS, 6oN-15oN, 72oE-77oE) in summer (June to October) influenced by the southwest monsoon and resulted in the development of surface chlorophyll. The interannual surface chlorophyll in the SEAS and the Indian ocean dipole (IOD) events were negatively correlated. IOD events exhibit a large diversity with different SST and wind patterns. Satellite observation revealed two extremely low surface chlorophyll concentration events in the SEAS during the summers of 2015 and 2019. Since both 2015 and 2019 occurred positive IOD, the study of them helps us to further understand the surface chlorophyll in the SEAS response to the different IOD events.