rainmaking


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rainmaking,

production of rainrain,
precipitation in liquid form. It consists of drops of water falling from clouds; if the drops are very small, they are collectively termed drizzle. Rain plays a key role in the hydrologic, or water, cycle in which moisture from the oceans evaporates, condenses into clouds,
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 by artificial means now generally disregarded, though it is probable that rainmaking hastens or increases rainfall from clouds suitable for natural rainfall. Interest in rainmaking has been spurred by factors including drought and the need for irrigation water. Until recent times it was thought that rain might be induced by explosions, updrafts from fires, or by giving the atmosphere a negative charge. Research during the 1930s showed that rain forms in warm clouds when larger drops of condensed water grow at the expense of smaller ones until they are big enough to fall; also that in cold clouds supercooled water below 5°F; (−15°C;) freezes into ice crystals that act as nuclei for snow. On this basis the American physical chemist Irving Langmuir and his associates carried on Project Cirrus from 1940 to 1952 to find ways to produce rain. Three methods resulted, including spraying water into warm clouds; dropping dry ice into cold clouds, where the dry ice freezes some water into ice crystals that act as natural nuclei for snow; and wafting silver iodide crystals or other similar crystals into a cold cloud from the ground or from an airplane over the cloud, with the crystals hastening the freezing of supercooled water between 27°F; (−2.8°C;) and 5°F;. Overseeding can dissipate a cloud. These techniques are only moderately successful; they cannot be relied upon in case of drought.

Bibliography

See Utah Water Research Laboratory, Development of Cold Cloud Seeding Technology for Use in Precipitation Management (1971); L. J. Battan, Cloud Physics and Cloud Seeding (1979).

rainmaking

[′rān‚māk·iŋ]
(meteorology)
Popular term applied to all activities designed to increase, through any artificial means, the amount of precipitation released from a cloud.
References in periodicals archive ?
Thai Ambassador to Jordan Pirya Khempon praised his country's relations with Jordan and said the delegation met with a number of Jordanian officials to discuss ways to ensure the success of artificial rainmaking project.
But applying rainmaking to smog is a relatively new idea.
Such manipulation is often associated with particular rainmaking sites (Daniel 1990).
It expresses the general values relating to rainmaking rather than an immediate part of an actual rainmaking process.
Minister Safar affirmed the need to benefit from cloud seeding and rainmaking in the field of agriculture and irrigation, particularly in light of the drought and climate changes affecting the region.
Caves were regarded here not only as places of refuge and shelter but were also used ritually, in rainmaking ceremonies.
Very little in this book was written with as much evident gusto as the section on the 1974 election, when Trudeau won back his majority thanks at least as much, English suggests, to Margaret's constant companionship as to Keith Davey's political rainmaking skills.
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The Rainmaking Presentations System was developed from the analysis of over 8,000 presentations," he explains.
In her 2'h years with the firm, with Lauren focusing on the financial planning and Bob focusing on the investments, this team has nearly doubled its assets under management, adding S15 million in AUM from existing clients who had assets Bob didn't know about, and while rainmaking isn't part of Lauren's job description, together they added another S20 million in new client assets from Lauren's community involvement and Bob's reputation.
Yet it could also mandate some degree of separation between the lawyer and the trusteemproof that the trustee neither recommended the lawyer nor provided a regular stream of rainmaking.
London, Jan 21 (ANI): Scientists have uncovered ashes within archaeological remains in Zimbabwe, which are indicative of ancient rainmaking fires, and can help date droughts in Iron Age Africa.