| Abstract Submission No. | ABS-1.2-0006 |
| Title of Abstract | Spatial variations of air-sea heat fluxes over the North Indian Ocean |
| Authors | PRAVAT RABI NASKAR* |
| Organisation | INDIA METEOROLOGICAL DEPARTMENT |
| Address | RAJARHAT KOLKATA, WEST BENGAL, India Pincode: 700135 E-mail: pravat091@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | To observe the spatial variations of Air-Sea Heat Fluxes (ASFs) over the North Indian Ocean (NIO), this study has been undertaken. For this, monthly high resolution (0.25°×0.25°) Surface Latent Heat Flux (SLHF) and Surface Sensible Heat Flux (SSHF), 10 m wind speed (WS), Sea Surface Temperature (SST), 2-m air temperature and dew point temperature and surface pressure data for the period 1979-2022 have been obtained from ERA5. The spatial pattern of SLHF and SSHF across the NIO and its subregions show significant spatial heterogeneity. The broad sub-regions of the NIO namely, the BoB and the AS show different heat fluxes. The SLHF over the AS is higher than the BoB with a maximum over SWA, near the Gujarat and Maharashtra coasts, around Sri Lanka and a minimum along the Arabia coasts. On the other hand, the SSHF is higher over the BoB than the AS with a maximum over the Andaman Sea, the SEB, ECB, and the SEA and a minimum along the Somalia and Arabia coasts. Similarly, the variations of bulk parameters can also be observed across the NIO and its sub-regions. The BoB shows a higher sea-air temperature gradient than the AS with a maximum over the Andaman Sea, the SEB, the ECB, and the SEA and a minimum near the coasts of Arabia and Somalia. Likewise, the AS shows higher WS and sea-air specific humidity gradient than the BoB with maximum WS in the WCA and SWA and maximum specific humidity gradient near the coastlines of Gujarat and Maharashtra, as well as over the SEA, NWB, and coastal regions of North and South Andaman Sea. The spatial pattern of SSHF closely follows the pattern of the sea-air temperature gradient, whereas the spatial pattern of SLHF is more complex and depends on both WS and specific humidity gradients. |
| Keywords | SLHF, SSHF, NIO, BoB, diurnal variation |