01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-03-0175 |
| Title of Abstract | Defining Seasonal-Spatial Ranges and Trends of Marine Water Quality Parameters in the Indian Coastal waters |
| Authors | Susmita Raulo*, B.S. Gayathri, Sanjiba Kumar Baliarsingh, Alakes Samanta, Suchismita Srichandan, Dhanya M. Lal, Sudheer Joseph, T.M. Balakrishnan Nair |
| Organisation | Indian National Centre for Ocean Information Services |
| Address | INCOIS, Pragathi Nagar Hyderabad, Telangana, India Pincode: 500090 E-mail: s.raulo-p@incois.gov.in |
| Country | India |
| Presentation | Oral |
| Abstract | Understanding the seasonal and spatial variability of marine water quality is essential for assessing ecosystem health, tracking anthropogenic changes, and guiding sustainable coastal management. This study presents a comprehensive analysis of long-term datasets (1965 to 2024), including shipboard observations, field campaigns, and sustained time-series records, to examine key water quality parameters across India⿿s coastal waters. The parameters analyzed include chlorophyll-a, dissolved oxygen (DO), pH, dissolved inorganic carbon (DIC), and major inorganic macronutrients such as nitrate, nitrite, phosphate, silicate, and ammonium. The analysis reveals distinct seasonal and regional patterns shaped by monsoonal cycles, freshwater influx, upwelling zones, and increasing anthropogenic pressures. Elevated chlorophyll-a and nutrient levels along the west coast during the southwest monsoon are linked to strong upwelling, while the east coast experiences nutrient enrichment from the river discharge. A marked increase in nitrogen-based nutrients over the past two decades, approximately two times higher on both the coasts, indicates growing eutrophication risks and more frequent algal bloom events. Seasonal hypoxia in the eastern Arabian Sea points to rising deoxygenation stress. These changes collectively highlight emerging ecological vulnerabilities. By establishing baseline ranges and identifying environmental hotspots, though constrained by data availability and location coverage, this study provides a valuable reference for tracking ongoing/future changes. The findings support the development of predictive tools, inform marine spatial planning efforts, and guide policy frameworks aimed at improving water quality monitoring and enhancing coastal ecosystem resilience. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Nutrients; Hypoxia; Pollution; Bay of Bengal; Arabian Sea |
| For Awards | yes |
| Date Of Birth | 08-04-1995 |
| ECSN Registration Number | IIOE2-ECSN-0118 |