01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-03-0363 |
| Title of Abstract | Precipitation Variability and Extremes over the Arabian Sea from Moored Buoy Observations and Satellite Estimates |
| Authors | Anjali Nair M*, Jossia Joseph K, Arul Muthiah M |
| Organisation | MOES - National Institute of Ocean Technology |
| Address | B-3, Colt's view Apartments, Madhuvinkarai, Guindy Chennai, Tamil Nadu, India Pincode: 600032 E-mail: anjalimnair91@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Global warming is intensifying the hydrological cycle, leading to significant changes in precipitation patterns through enhanced evaporation and greater atmospheric moisture-holding capacity. Understanding these changes is particularly important over the Indian Ocean, a key region that drives the Asian monsoon system and influences global climate variability. However, precipitation observations over the ocean remain sparse due to limited in-situ measurements, making satellite-based products the primary source of rainfall information. This study utilizes high-resolution (2-min) in-situ precipitation data collected from five moored met-ocean buoys deployed across the Arabian Sea from north to south during 2012â¿¿2024. These observations are used to investigate precipitation variability at monthly, seasonal, and annual scales. Spatial and temporal variations in rainfall intensity, frequency, and type are analyzed, with particular attention to their modulation by large-scale atmospheric phenomena and tropical cyclones. Buoy rainfall measurements are further employed to validate satellite-based IMERG precipitation estimates, enabling an assessment of their consistency and identification of biases. The role of thermodynamic processes, particularly the Clausiusâ¿¿Clapeyron relationship, is also examined to understand how warming influences precipitation extremes. The results highlight pronounced spatial and temporal variability in rainfall, strongly governed by monsoonal dynamics and extreme weather events. Validation demonstrates broad agreement between buoy and IMERG data, while also revealing discrepancies during intense precipitation episodes and transitional phases of the monsoon. The findings underscore the importance of sustained in-situ measurements for refining satellite retrieval algorithms and improving the reliability of precipitation datasets over oceanic regions. They also provide valuable insights for enhancing climate model simulations and strengthening regional monsoon prediction in the context of a warming climate. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Precipitation, moored buoy data, IMERG data, seasonal variability, monsoon, tropical cyclones |
| For Awards | no |