PRECIPITATION & WEATHER MODIFICATION

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Presentation transcript:

PRECIPITATION & WEATHER MODIFICATION ATM OCN 100 - Fall 2001 LECTURE 15 PRECIPITATION & WEATHER MODIFICATION A. INTRODUCTION Statement of the Problems Why no precipitation? Can humans cause rain?

H. WEATHER MODIFICATION BACKGROUND Statement of Problem Why no precipitation? Can humans cause rain? For precipitation, need: sufficient atmospheric humidity; a cloud; sufficiently large raindrops/snowflakes to fall & reach ground as rain or snow.

INTENTIONAL ARTIFICIAL WEATHER MODIFICATION Goals Stimulate Precipitation Dissipate Clouds & Fog Suppress Hail Modify Hurricanes

C. WEATHER MODIFICATION (con’t.) Precipitation Stimulation Techniques - "Cloud seeding" Early Weather Modification Techniques Modern Precipitation Stimulation Strategies Problems Scientific Legal

TYPICAL STRATEGIES WARM CLOUDS Add large hygroscopic nuclei. COLD CLOUDS Freeze all supercooled droplets with Dry Ice (Solid CO2); Add freezing nuclei with ice-like crystal structure with Silver Iodide (AgI).