01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-04-0369 |
| Title of Abstract | CHARACTERISTICS OF OCEAN HEAT CONTENT IN THE NORTHERN INDIAN OCEAN AND ITS LONG-TERM VARIABILITY |
| Authors | Sreelakshmi S*, Vaishnav Sharun K Rajan, Prasanna Kumar S, Jossia Joseph K, C Anoopa Prasad, Prabin Kumar Kar, R Janani, Arul Muthiah M |
| Organisation | National Institute of Ocean Technology |
| Address | Parekkappillythara House, Nedungad, Nayarambalam P O, Ernakulam Kochi, Kerala, India Pincode: 682509 E-mail: sreelakshmispk2000@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Global warming has led to a significant variability in the upper ocean thermal structure. As one of the first attempts to study the Upper Ocean Heat Content in the Northern Indian Ocean, the present study utilizes insitu observations from Ocean Moored buoy Network for Northern Indian Ocean (OMNI) for the period 2014 to 2024 and monthly mean data of Ocean Heat Content for the period 1960-2024, obtained from the European Centre for Medium-Range Weather Forecasts ECMWF Ocean Reanalysis System 5 (ORAS5) for basin-wide analysis. The SST analysis has been carried out using the International Comprehensive Ocean-Atmosphere Data Set (ICOADS). The time evolution of the calculated OHC from the insitu observations at 10-30 m showed a bi-modal distribution with primary and secondary peaks in May and October, respectively, while the primary and secondary minima were in January and August, showing a close correspondence with incoming solar radiation. The OHC variation at 50-500 m appeared to exhibit intra-seasonal to inter-annual variation. The long-term analysis of ORAS5 OHC in the Arabian Sea, averaged over 40-78°E, 5-25°N from 1960 to 2024, reveals that at 0-300 m, the OHC shows an increasing trend of 4.7 ÿ 1013 J/m2 from 1960 to 2007 and a greater warming trend from 2007 with 44.4 ÿ 1013 J/m2 from 2007 to 2024. At 0-700 m, between 1960 and 2009, shows a decreasing trend of -3.3 ÿ 1013 J/m2 and a rapid warming trend of the basin is observed from 2009, showing 81.9 ÿ 1013 J/m2. The OHC in the Bay of Bengal, averaged over 78-100°E, 5-25°N for the same period, reveals a similar, but an increased warming trend. SST and OHC were correlated with multiple anthropogenic and environmental drivers and the spatial variability of OHC has also been analyzed in the study. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Upper Ocean Heat Content, OMNI Buoy, Seasonal-interannual variability, Arabian Sea, Bay of Bengal, ORAS5 |
| For Awards | yes |
| Date Of Birth | 25-01-2000 |
| ECSN Registration Number | IIOE2-ECSN-0185 |