Context
A study by the Indian Institute of Tropical Meteorology (IITM), Pune has found that nearly 25% of monsoon rainfall evaporates before reaching the ground over parts of India. The findings will improve weather forecasting, monsoon prediction, and climate models by better representing rainfall processes.
Explanation:
- Raindrop evaporation is the process by which falling raindrops evaporate before reaching the Earth’s surface, especially in dry and warm sub-cloud layers.
- During the Southwest Monsoon (June–September), evaporation rates vary with temperature, humidity, wind, and raindrop size.
- Evaporation causes evaporative cooling, creating cold pools and downdrafts, which influence cloud formation, convection, and rainfall intensity.
- The study used stable water isotopes (heavy oxygen and hydrogen isotopes) to estimate rain mass lost through evaporation.
- Accurate estimation of raindrop evaporation helps improve Numerical Weather Prediction (NWP), climate models, monsoon dynamics, hydrological cycle studies, and water resource planning.
- The findings are significant for enhancing disaster preparedness, agricultural advisories, and understanding the impacts of climate change on India’s rainfall patterns.
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