01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-06-0321 |
| Title of Abstract | Seasonal Cycle in the upper ocean and its regulation by ENSO and IOD - A Comparison Between Arabian Sea and Bay of Bengal |
| Authors | Shamaita Das Hridi*, Sukumaran Prasanna Kumar |
| Organisation | Goa University |
| Address | Taleigao Plateau Panaji, Goa, India Pincode: 403206 E-mail: shamaita335@gmail.com |
| Country | India |
| Presentation | Poster |
| Abstract | Seasonal cycle is a dominant mode of variability of the northern Indian Ocean (NIO) driven by the summer and winter monsoons. Though the temporal evolution of the seasonal cycle and spatial variability of its magnitude are well-researched and well understood, the vertical extension of this signal is poorly known. This is the motivation of the present study in which high resolution spatial data from the recently released World Ocean Atlas 2023 (WOA23) were used. The monthly mean climatology of temperature and salinity profiles were used to compute the amplitude and phase of the annual and semi-annual variability in the Arabian Sea (AS) and the Bay of Bengal (BoB). The spatial structure of the amplitude and phase of both annual and semi-annual cycle showed distinct difference between the AS and the BoB. Similarly, the vertical penetration of this signal also showed a large difference between the two basins. The reasons for this were examined in the light of basin-specific regional oceanography. Analysis underscored the role of stratification and Rossby waves in regulating the vertical extension of the semi-annual and annual cycles. On the inter-annual time scale El Nino-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) played a major role in regulating the vertical extension. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Seasonal cycle, Amplitude, Phase, Stratification, Rossby wave, North Indian Ocean |
| For Awards | no |