25% of North Western Ghats Rain Vanishes Mid-Air, Study Finds
GS3Economy · S&T · Environment · Security· Climate change & international agreements· Prelims·
Why in news
IITM Pune study revealed that 25% of rainfall over the North Western Ghats evaporates mid-air during the Southwest monsoon, providing critical data for refining weather models.
Background
The study, published in Atmospheric Chemistry and Physics, used isotopic analysis to measure raindrop evaporation. It found that while the average evaporation is 25%, the daily variance ranges from 4% to 61% during the June-September monsoon period.
Facts for Prelims
- BodyIITM (Indian Institute of Tropical Meteorology) is headquartered in Pune.
- FactAverage mid-air rain evaporation in North Western Ghats is 25% during the Southwest monsoon.
- FactRaindrop evaporation rates vary globally, with tropical estimates near 20% and Barbados near 60%.
- S&TIsotopic analysis is used to measure the evaporation of rain mass.
For Mains
Q. Discuss how understanding micro-scale atmospheric processes like raindrop evaporation can enhance the accuracy of monsoon prediction models in India.
Dimensions to cover in your answer
- Model accuracy: Current climate models struggle to capture sub-cloud layer cooling and downdraft dynamics caused by mid-air evaporation.
- Regional variability: Evaporation rates are highly sensitive to local temperature and humidity gradients from arid zones to coastal regions.
- Predictive reliability: Inaccurate evaporation data skews rainfall predictions and the assessment of storm-triggering potential.
Keywords: Atmospheric Chemistry · Monsoon Dynamics · Isotopic Analysis · Sub-cloud Layer · Weather Modeling
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