Understanding biophysical interactions over the tropical Indian Ocean in a changing climate
Aditi Modi*, Dr. Roxy Mathew Koll
Indian Institute of Tropical Meteorology, Pune
IITM Dr. Homi Bhabha road, Pashan PUNE, Maharashtra, India Pincode: 411008 Mobile: 7768980280 E-mail: email@example.com
Marine primary productivity is central to the marine ecosystem processes and global biogeochemical cycles. The Indian Ocean has experienced the most significant surface warming amongst other tropical ocean basins during the past half-century. Previous studies have investigated the response of the marine ecosystem to ocean warming in the western tropical Indian Ocean and found that there is a reduction in marine primary productivity caused by warming of the ocean surface. The seasonal cycle of phytoplankton is very significant in the tropical Indian Ocean due to the semi-annual reversal of winds at the equator. Climate change is also expected to alter the seasonality of phytoplankton through modifications to the underlying physical drivers controlling bloom timing. This variability in the phenology of these phytoplankton blooms will affect the ecosystem dynamics with repercussions for the carbon export production and availability of food at higher trophic levels. This work aims to use satellite and in-situ observations along with a suite of model outputs (IITM-ESM and CMIP5) to understand the changes and variability in bloom timings and abundance in response to the change in physical variables under a changing climate.