Note4Students
From UPSC perspective, the following things are important :
Prelims level: Cloud Seeding
Mains level: Drought mitigation in India
Central Idea
- Solapur, a city with limited rainfall due to its location on the leeward side of the Western Ghats, witnessed an 18% relative enhancement in rainfall through a cloud seeding experiment.
What is Cloud Seeding?
Explanation | |
Definition | Weather modification technique to enhance precipitation. |
Objective | Increase rainfall or snowfall in areas facing water scarcity or drought. |
Seeding Agents | Silver iodide, calcium chloride, potassium iodide, sodium chloride, etc. |
Suitable Clouds | Typically convective clouds with moisture and vertical motion. |
Methods of Dispersion | Aircraft, rockets, ground-based generators, drones. |
Environmental Impact | Generally considered safe with minimal environmental impact. |
Effectiveness | Variable; depends on weather conditions and cloud characteristics. |
About CAIPEEX Experiment
- The initiative, known as the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX phase-4), sought to investigate the effectiveness of hygroscopic seeding in deep convective clouds.
- Over two hours after cloud seeding, an additional 8.67mm of rainfall was recorded, resulting in 867 million litres of augmented water availability.
Importance of the Experiment
- Growing NCD Burden: As India grapples with a rising burden of non-communicable diseases (NCDs), exacerbated by the consumption of pre-packaged foods, informed consumer choices and food safety become paramount.
- Cloud Seeding Efficacy: The experiment underscores cloud seeding as an effective strategy for enhancing rainfall, particularly in regions with suitable conditions.
- Cost-Benefit Analysis: The research evaluates the cost-effectiveness of cloud seeding, estimating the cost of producing water through cloud seeding at 18 paise per litre.
Key Findings and Methodology
- Randomized Seeding Experiment: The study selected 276 convective clouds, with 150 subjected to seeding and 122 serving as the control group.
- Criteria for Seeding: Clouds with characteristics such as significant liquid water content, vertical motion indicative of cloud growth, and depth exceeding one kilometre were targeted.
- Seeding Agent: Calcium chloride flares were employed for cloud seeding, ensuring optimal dispersion and entry into growing clouds.
- Rainfall Enhancement: Seeded clouds produced more rainfall than unseeded ones, resulting in an 18% relative enhancement.
Implications and Future Prospects
- Water Management: While cloud seeding alone cannot alleviate droughts, it can contribute to an 18% increase in rainfall and partially address water requirements.
- Cost Reduction: Utilizing indigenous seeding aircraft could reduce costs by over 50%, making cloud seeding more accessible.
- High-Resolution Numerical Model: The study has developed a numerical model to help stakeholders identify target locations, suitable clouds for seeding, and effective strategies for enhancing rainfall.
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