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Seeding cumulus in Florida: new 1970 results
Science (New York, N.Y.)
|April 9, 1971
Summary
Dynamic cloud seeding significantly increased rainfall by over three times in Florida experiments. This effect was strongest on fair days, offering potential for rainfall enhancement in tropical regions.
Area of Science:
- Atmospheric Science
- Cloud Physics
- Weather Modification
Background:
- Understanding cloud dynamics is crucial for weather modification.
- Previous research on dynamic seeding has shown varying results.
- Tropical rainfall patterns are complex and significantly influenced by cloud systems.
Purpose of the Study:
- To quantify the dynamic seeding effect on rainfall in single cloud experiments.
- To investigate the impact of seeding on different weather conditions (fair vs. rainy days).
- To explore the potential of cloud mergers for rainfall enhancement and their role in large-scale circulations.
Main Methods:
- Statistical analysis of rainfall data from Florida single cloud experiments (1968 and 1970).
- Objective definition of fair days based on shower coverage.
- Numerical modeling and cloud population studies to assess applicability.
- Initial experiments on inducing and documenting cloud mergers.
Main Results:
- Dynamic seeding demonstrated a large, positive, and significant effect on rainfall, increasing it by over threefold.
- The seeding effect was more pronounced on fair days compared to overall averages.
- Cloud mergers were observed to produce significantly more rain than isolated clouds, likely due to enhanced circulations.
Conclusions:
- Dynamic cloud seeding is a viable method for substantial rainfall enhancement, particularly in fair weather conditions.
- Cloud mergers represent a promising new frontier in dynamic cloud modification technology.
- Further research, including cloud population studies and multiple cumulus seeding, is needed to refine techniques and understand large-scale atmospheric processes.
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