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Cloud Seeding - growth? | (Read 337 times) |
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alexisavoire
Posts: 120
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February 28, 2008, 12:29:36 PM |
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1.
"Cloud seeding is a form of weather modification. It can be used to disperse fog, suppress hail, or control winds, but is most often used to increase precipitation. "
"In order to understand the process, however, a basic understanding of clouds and how precipitation is formed is needed."
"As warm air rises from the Earth, it begins to cool and forms tiny droplets of water that condense into cloud droplets. Cloud droplets are formed around particles of dust, salt, or soil (called cloud condensation nuclei) that are always present in the atmosphere. These cloud droplets group together into clouds, which can form precipitation in one of two ways. In warm temperatures, the droplets in the clouds merge with many other droplets and become heavy enough to fall to the Earth as rain. (It takes millions of cloud droplets to form a single raindrop.) In colder temperatures, the droplets of water form ice crystals. Other droplets freeze onto these ice crystals, which grow larger and heavier until they fall to the ground as rain, snow, or hail. "
"There are three types of cloud seeding: static mode, dynamic mode, and hygroscopic seeding."
"Static mode cloud seeding seeks to increase rainfall by adding ice crystals (usually in the form of silver iodide or dry ice) to cold clouds. Dynamic mode cloud seeding increases rainfall by enhancing "vertical air currents in clouds and thereby vertically process more water through the clouds." Basically, in this method of seeding, a much larger number of ice crystals are added to the cloud than in the static mode. In hygroscopic seeding, salt crystals are released into a cloud. These particles grow until they are large enough to cause precipitation to form. Clouds can be seeded from above with the help of airplanes that drop pyrotechnics, or from the ground by using artillery or ground-to-air rockets."
"The science of weather seeding is not without controversy. Many question the validity of the results, since they are difficult to prove. Others feel that science shouldn't interfere with nature. Still others claim that increasing rain in one area decreases it in another, in effect, "stealing" rain from other lands that may be in need. Many states have also passed legislation that attempts to regulate cloud seeding and other forms of weather modification." -ask.yahoo.com
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For a while, there was growing hope that weather modification in the form of cloud seeding could provide more water for the Edwards Aquifer and also potentially reduce agricultural demand. In 2003, scientists at the National Academy of Sciences concluded there is no scientific evidence that it works (11). The American Meteorological Society's official position is that there has been some statistical evidence showing a 10 percent increase in precipitation after cloud-seeding, but no conclusive cause and effect. -The Edwards Aquifer Site
3.
Seed for rain to grow the seeds to grow the crops to fuel the alternative cars to get to work to afford the seeds to plant the gardens that call for rain. Or quit the cars that clog the air that stifle the natural cleansing processes like rain, wind, air currents, evaporation of surface water and ocean currents - get out there and do a rain dance with both legs on the ground and both arms in the air and maybe global warming will find its own solution.
Meanwhile, public transportation can't get us to work on time and housing inside the urban perimeter is prohibitive so no reason to feel guilty about driving a car.
Bikes work well but commutes can be long and we still have to plant, grow and eat the garden produce...
Problems are a challenge that make us wiser in the long run not satisfied in the short run...
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