01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-03-0020 |
| Title of Abstract | Role of ocean dynamics in connecting the North Indian Ocean variability with the Arctic Ocean |
| Authors | Arnab Mukherjee*, Anirjita Das |
| Organisation | National Centre for Polar and Ocean Research (NCPOR) |
| Address | Headland Sada, Vasco Da Gama South Goa, Goa, India Pincode: 403804 E-mail: arnab@ncpor.res.in |
| Country | India |
| Presentation | Oral |
| Abstract | In this study, a numerical model simulation has been performed to understand the role of the Arctic Ocean (AO) on upper ocean variability of the North Indian Ocean (NIO) at various time scales from intraseasonal to seasonal, interannual, and decadal. A global Modular Ocean Model of version 5 with Sea Ice Simulator (MOMSIS) has been used for this study with a horizontal resolution of 25 km x 25 km in longitude-latitude direction and 50 vertical levels. The role of AO on NIO variability has been quantified using a model experiment in which the year-to-year atmospheric forcing in the Arctic regions of the MOMSIS has been replaced with its climatology values so that the impact of the recent increase in Arctic ocean warming can be estimated globally. The model simulation showed that the role of ocean dynamics is prominent through the Atlantic Ocean pathway compared to the Pacific Ocean. The connection of NIO with AO through the Atlantic Ocean also signifies the role of the Southern Ocean in it. The preliminary result also showed that the impact of AO on NIO is dominant on ocean current variability compared to Sea Surface Temperature (SST) and Sea Level Anomaly (SLA) due to the dominance of ocean vertical processes. Also, the role of AO on NIO increases at decadal time scales compared to intraseasonal due to significant remote forcing impact via ocean circulations. Due to AO and NIO pathways via the Southern Ocean, the strong impact of AO has been observed in the equatorial Indian Ocean Bay of Bengal, and the Arabian Sea. This study shows that the recent significant warming in the AO has a significant impact on ocean physics and monsoon variability in the NIO via ocean pathways. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | North Indian Ocean, Arctic Ocean, Ocean dynamics, Remote Forcing, Upper Ocean variability, Monsoon variability |
| For Awards | no |