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Abstract Submission No. | ABS-2022-03-0384 |
Title of Abstract | Impact of Bay of Bengal SST Gradients on the Indian Summer Monsoon Rainfall |
Authors | Kiran V.G.*, Dr. Anguluri Suryachandra Rao, Dr Prasanth A Pillai |
Organisation | IITM,Pune |
Address | Monsoon Mission,IITM,Pashan Pune, Maharashtra, India Pincode: 411008 Mobile: 7012787813 E-mail: kiranvg92@gmail.com |
Country | India |
Presentation | Oral |
Abstract | Northern Indian Ocean serves as an ideal space to study the interaction between Ocean and atmosphere as it accommodates unique and versatile oceanic conditions and the largest monsoonal circulation in the world.Through this study we aim to understand the Impact of mesoscale SST features in Bay of Bengal on the Indian Summer monsoon . The South Asian Monsoon System ,being the largest of its kind, has a direct impact on the lives and livelihoods of billions of people living in the Indian Subcontinent. Various factors that influence its strength and characteristics have been studied extensively throughout the years. But, owing to its complex and dynamic nature , a comprehensive understanding and accurate prediction of the monsoon remains a work in progress. Several Oceanic components that play part in monsoon processes have been identified. The focus of our study area is the Bay of Bengal ,which is distinguished from other oceans due to its highly stratified upper layers. While the influence of overall SST and meridional SST gradients in the Bay have been analysed in previous studies, the role of smaller oceanic features is largely unexplored. Several studies across the globe have shown that SST gradients along the path of wind cause a change in the speed and direction of wind. It is expected to be reflected in the Bay of Bengal Air-Sea interaction , which may influence the circulation on a larger scale. Sensitivity experiments, conducted using GFS v14 (Semi-lagrangian,resolution 12km) showed a difference in monsoonal strength and distribution when the mesoscale SST gradients in Bay of Bengal were diluted down. A change in the overall strength of monsoonal circulation was observed, which varied from year to year suggesting that the type and strength of gradients present in the bay and their alignment with respect to the wind direction may be a factor in determining their effect on net circulation. Understanding these processes will further enable us to better represent them in the model simulations and thus help in an advancement of prediction systems. |