01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-02-0155 |
| Title of Abstract | ESTIMATING CROSS-SHORE FLUX ALONG INDIAN COAST USING OBSERVATION AND MODEL DATA |
| Authors | THEERTHA P*, ROHITH B, KRISHNAPRIYA M S |
| Organisation | INDIAN NATIONAL CENTRE FOR OCEAN INFORMATION SERVICES |
| Address | INCOIS HYDERABAD, TELANGANA, India Pincode: 500090 E-mail: theerthapariyarath@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Cross-shelf exchanges have a ubiquitous influence on the blue economy. The exchanges between shelf seas and the open ocean are critical for global biogeochemical cycles, transporting nutrients, sediments, carbon, and heat that sustain more than 90% of the world⿿s fish catches and contribute to the ocean⿿s role as a major carbon sink. The variability and spatial distribution of cross-shore fluxes (CSflux) along the Indian shelf sea margin were investigated using Acoustic Doppler Current Profiler (ADCP) observations from 17 shelf and slope locations, complemented by a high-resolution (1/12°) ocean reanalysis (GLORYS). Using reanalysis data, CSflux was calculated along the 150 m isobath. ADCP data span 2008⿿2023, with continuous measurements available for 1⿿5 years at each location. The reanalysis product covers 1995⿿2020, and CSflux was calculated along the 150 m isobath of the Indian shelf seas. CSflux was computed by integrating daily averaged tide-residual cross-shore velocity. CSflux from reanalysis was evaluated against observations, showing close agreement in variability and standard deviation at most locations. Observed CSflux ranges from 3 to 17 m²/s, representing 20⿿60% of alongshore fluxes, with slope values exceeding shelf values. These flux values are comparable to those reported for other global oceans. Four hotspots of CSflux are identified from reanalysis and observations: the northeastern coast (near Paradeep/Digha and Kakinada/Gopalpur), the southern tip (Kanyakumari), and the central west coast (Goa). Northeastern and Kanyakumari sites exhibit CSflux comparable to alongshore fluxes. Seasonal variability is strongest from November to March, with minima during the monsoon, except at Kanyakumari, Goa, and Kakinada, where monsoonal peaks occur. This study provides the first quantitative estimates of CSflux along the Indian shelf seas, highlighting key regions for targeted observation and their potential role in nutrient exchange, fisheries productivity, carbon sequestration, and coastal⿿open ocean connectivity. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | CROSS SHELF EXCHANGES, CROSS SHELF FLUX, SHELF SEAS |
| For Awards | no |