- Dona Paula, Goa, India.
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| Abstract Submission No. | ABS-2022-04-0262 |
| Title of Abstract | Evidence for wind-driven bottom current in the equatorial Indian Ocean |
| Authors | P. Amol*, V. Jain, S. G. Aparna |
| Organisation | CSIR-National Institute of Oceanography |
| Address | CSIR-National Institute of Oceanography, Regional Centre, 176 Lawsons Bay Colony Visakhapatnam, Andhra Pradesh, India Pincode: 530017 Mobile: 9404456782 E-mail: amol@nio.org |
| Country | India |
| Presentation | Oral |
| Abstract | We use spectra of zonal currents at ⿼4000 m depth to show signatures of surface wind forcing in the near-bottom circulation. The data were collected from deep-sea moorings that were deployed along the equator from 2000-2020. The zonal velocity spectra show a shift in the dominant frequencies from the east to the west. The 30⿿90-day period is stronger at 93E, the 60⿿120-day period at 83E, 120⿿180-day period at 77E. This shift in frequency can be explained using the theoretical ray paths of Kelvin and Rossby waves. The signatures of these wind-generated waves propagating downwards as equatorial beams are also evident in the direct current measurements from the near-surface and intermediate depths. |