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CLOUD SEEDING

CLOUD SEEDING

Cloud seeding is the process of spreading either dry ice or more commonly, silver iodide aerosols, into the upper part of clouds to try to stimulate the precipitation process and form rain. Cloud seeding uses planes to spray clouds with chemicals to condense smaller particles into larger rain droplets. Cloud seeding increases rainfall rates by approximately 10% to 30% per year and cloud seeding operations cost much less than the desalination process.

Cloud Seeding Methods

• Hygroscopic Cloud Seeding: Disperses salts through flares or explosives in the lower portions of clouds. The salt grows in size as water joins with them.
• Static Cloud Seeding: It involves spreading a chemical like silver iodide into clouds. The silver iodide provides a crystal around which moisture can condense. The moisture is already present in the clouds, but silver iodide essentially makes rain clouds more effective at dispensing their water.
• Dynamic Cloud Seeding: It aims to boost vertical air currents, which encourages more water to pass through the clouds, translating into more rain. The process is considered more complex than static cloud seeding because it depends on a sequence of events working properly.

Applications of Cloud Seeding

• Tourism: Cloud seeding can transform typically dry areas much more hospitable to enhance tourism.
• Tackle Air Pollution: Cloud seeding can potentially be used to settle down toxic air pollutants through the rain. E.g.: Recently, the Central Pollution Control Board along with other researchers mulled the use of cloud seeding to tackle Delhi’s air pollution.
• Agriculture: It creates rain, providing relief to drought-stricken areas.
• Power Generation: Cloud seeding experiments have shown to augment production of hydroelectricity during the last 40 years in Tasmania, Australia.
• Water Pollution Control: Cloud seeding can help to maintain minimum summer flows of the rivers and dilute the impact of treated wastewater discharges from municipalities and industries.
• Fog Dispersal, Hail Suppression, and Cyclone Modification: During the winter the cloud seeding programme is used to increase the mountain snowpack so that additional runoff is received during the spring melt season. “Project Sky Water” of the U.S.A. in 1962 for weather modification through cloud seeding aimed at fog dispersal, hail suppression, and cyclone modification.

Challenges involved in Cloud Seeding

• Potential Side-effects: The chemicals used in cloud seeding might be potentially harmful to plants, animals, and people, or the environment.
• Abnormal Weather Patterns: It might ultimately change climatic patterns on the planet. Places that normally receive moisture might start experiencing drought due to the artificial process of adding chemicals to the atmosphere to stimulate rain.
• Costly: It involves processes such as delivering chemicals to the sky and releasing them into the air by flare shots or airplanes, which involves huge costs and logistic preparation.