01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-08-0236 |
| Title of Abstract | Seasonal Variability in Direction and Eccentricity of Mesoscale Eddies in the Eastern Arabian Sea |
| Authors | Midhila Varna V*, Jithin Abraham K, Francis PA |
| Organisation | INCOIS, Hyderabad |
| Address | INCOIS, Hyderabad Hyderabad, Telangana, India Pincode: 500090 E-mail: m.varna-p@incois.gov.in |
| Country | India |
| Presentation | Oral |
| Abstract | Mesoscale eddies are critical features of the upper-ocean circulation, modulating energy transfer, heat transport, and biological productivity in the Arabian Sea. This study investigates the seasonal variability in the direction and eccentricity of mesoscale eddies in the Eastern Arabian Sea, with particular attention to how the reversal of the mean monsoonal currents influences eddy propagation pathways. Using eddy-tracking algorithms applied to satellite altimetry products (AVISO), data assimilated products (RAIN) and reanalysis datasets (GLORYS), we assess whether the observed seasonality is consistently represented across data sources. Results reveal a clear seasonal shift in eddy direction, which is northwestward propagation during winter (December) and southwestward propagation during summer (August). This shift in direction reflects the semi-annual reversal of the West India Coastal Current and associated monsoon-driven circulation changes. Eccentricity analysis further highlights systematic seasonal differences in eddy geometry, suggesting that current reversals not only steer eddy trajectories but also modulate their structure and stability. Figures supporting this analysis include eddy trajectory maps for different seasons, as well as monthly heat maps showing the density of southwestward and northwestward propagating eddies. Together, these findings advance our understanding of the regional role of mesoscale eddies in monsoon-driven circulation and provide a foundation for evaluating eddy impacts on transport processes, upwelling, and ecosystem dynamics in the Eastern Arabian Sea. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Mesoscale eddies, Seasonal variability, Eddy directionality, Eddy eccentricity, WICC, Eastern Arabian Sea |
| For Awards | yes |
| Date Of Birth | 14-12-1994 |
| ECSN Registration Number | IIOE2-ECSN-047 |