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| Abstract Submission No. | ABS-2022-04-0230 |
| Title of Abstract | Indian Coastal Radar Network (ICORN): A New-Age Monitoring System for Coastal Circulation Processes along the Indian Coast |
| Authors | Sourav Sil*, Samiran Mandal, Avijit Gangopadhyay, B. K. Jena, R. Venkatesan |
| Organisation | Indian Institute of Technology Bhubaneswar |
| Address | School of Earth, Ocean and Climate Sciences Jatni, Odisha, India Pincode: 752050 Mobile: 7750007822 E-mail: souravsil@iitbbs.ac.in |
| Country | India |
| Presentation | Poster |
| Abstract | Ocean surface currents have been measured since late 2009 using a network of high-frequency radars (HFR) (SeaSonde). The systems are installed and operated by the National Institute of Ocean Technology (NIOT), Ministry of Earth Sciences (MoES), India. These surface current observations from Indian Coastal Radar Network (ICORN) are a revolution to provide a unique opportunity on studying the multiscale coastal processes, from the extraction from tidal currents to the interannual variability of surface currents. The high frequency and high-resolution HFR currents made it possible to extract the tidally driven currents and their spatial characteristics due to major (M2, S2, N2, K1, and O1) and shallow water (M4, MS4, M8, etc.) tidal constituents along the Indian coast. The hourly observations also enable to characterize the frontal eddies due to a strong temperature gradient during spring and salinity gradient in autumn on the western Bay of Bengal (BoB). The HFR observations also helped for identification, characterization, and monitoring of the evolution of the coastal mesoscale eddies in the BoB. The HFR currents are validated with satellite-derived surface currents, the drifter, and NIOT moored buoy on a different time scale. The HFR derived surface currents captured the seasonal reversibility of the boundary currents, northward propagating Western Boundary Current (WBC) during March-May and southward propagating East India Coastal Current (EICC) during November-December in the western BoB. The HFR data are being utilized for the measurement of the ocean currents during the cyclone passages. The HFR data also made it possible to quantify the tidal asymmetry in the northeastern Arabian basin, which is well-known for high tidal variability. The impact of the IOD and ENSO events on the coastal currents are also observed in the HFR observations. During the negative phase (2016) of the IOD, the southward EICC is found to be stronger, whereas, the springtime WBC is relatively active in the positive phases (2015). The efficient and quality data provided by the ICORN has recently increased its popularity towards operational oceanography. |