Please explain what is artificial rain and?

Question

what is its significance? can we cause artificial rain over a vast area? HOw? Explain in depth.....

Answer 1

The role of weather modification, or rain-making, is an important component in water resource management.

The process involved in artificial rain-making involves three easy-to-understand stages. The first stage is agitation. That is using chemicals to stimulate the air mass upwind of the target area to rise and form rain clouds.

The chemicals used during this stage are calcium chloride calcium carbide, calcium oxide, a compound of salt and urea, or a compound of urea and ammonium nitrate. These compounds are capable of absorbing water vapour from the air mass, thus stimulating the condensation process.

The second stage is called building-up stage. Here the cloud mass is built up using chemicals such as kitchen salt, the T.1 formula, urea, ammonium nitrate, dry ice, and occasionally also calcium chloride to increase nuclei which also increase the density of the clouds. In the third stage of bombardment chemicals such as super-cool agents: silver iodide and dry ice are used to reach the most unbalanced status which builds up large beads of water (Nuclei) and makes them fall down as raindrops.

In planning every stage a high degree of expertise and experience is required, in selecting the types and amounts of chemicals to be used, while taking into consideration weather conditions, topographical conditions, wind direction and velocity as well as the location or delimitation of the area for chemical seeding. Several other ideas are also involved in rain making. Rockets containing rain-making chemicals can be fired into the clouds either from the ground or from aircraft.

A jet of rain-making chemicals is shot from a highly pressurised cannister directly into the cloud base, so as to coerce clouds which normally hang above mountain tops to cluster up and rain on the mountain or their slopes.

Rain-making chemicals are added to super-cooled clouds, i.e., those at altitudes above 18,000 metres, to stimulate the formation of ice crystals in the cloud or cloud cluster.

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Artificial rain is not really that effective and also not very well controllable. It has been applied successfully in isolated instances - and in China it did help to locally ease the effects of devastating droughts. However, there is no change in the long term weather patterns or climate. That has a number of reasons. Rain is not just over-saturated air out of which the water falls just like that. The process that leads to rain is fantastically complicated geochemistry. It can happen that you get 100% humidity but still: no rain. When the temperature drops you only get over saturated air and fog, yet still: no rain. And even if enough surface water is available, nothing happens. Only the evaporation stops. What you need is something to jumpstart the process. Silver Iodine is one possibility to artificially create condensation seeds, but then one constantly has to fly around with airplanes and mass-spray the atmosphere with silver iodine, which is not really that clever a solution.

If we look at regions with ample rainfall - what do we find? We find a lot of biological activity. We find a lot of wind over the sea. Complex biochemical reaction networks in combination with evaporation and wind transport a large number of compounds into the atmosphere, where they begin to react with each other and the atmospheric compounds. I quote from http://www.bulkmsm.com/research/msm/page26.htm:

"Chemical change in the atmosphere is driven largely by reactions of photo chemically generated free radicals. Sophisticated experimental techniques are required to quantitatively characterize important atmospheric photochemical processes as well as the kinetics and mechanisms of the fast free radical reactions that result. In our laboratory, laser flash photolysis and fast flow techniques are employed to generate reactive intermediates of interest, and a variety of optical and mass spectrometric techniques are employed to probe the evolution of reactants and products. The experimental results provide needed input into models of atmospheric transport and chemical transformation that are employed to understand phenomena such as global climate change, stratospheric ozone depletion, urban air quality, and acid precipitation. Results of our studies also provide fundamental information that is useful for establishing free radical thermo chemistry and for refining reaction rate theories. We are interested in gas-phase chemistry as well as chemistry that occurs in the atmospheric condensed phase, i.e., on the surfaces or in the bulk of cloud droplets and/or aerosol particles."

This gives an idea of where we are standing on the issue. We only begin to understand the mechanisms leading to rain. So-called artificial rain is at this stage a science fiction idea. The impact of seeded rain is short living because the general conditions responsible for the drought do not change. The entire landscape would need to be changed - wasteland would need to be re-forested etc. A long and painful process

Answer 2

Artificial rain or cloudseeding is an attempt to take some control over the weather, it's not been very successful to date.

Water droplets form when atmospheric water vapour condenses around a nucleii, typically a particle of dust, pollution etc. The idea being that by introducing an artificial nucleii into the atmosphere the condensation process can be accelerated.

The usual nucleii is silver iodide which can be released from planes or fired into the atmosphere by missiles.

It doesn't actually cause any additional rain as the water vapour in the atmosphere would have fallen as rain of it's own accord, it's more of an attempt to control where and when the rain falls.

It has met with limited success but as with so many aspects of weather, the results are unpredictable. The Soviets experimented extensively with the concept back in the days of the Cold War and whilst they were able to make it rain sooner than it would have otherwise they weren't really able to control where or when the rain fell.

In recent years they have dramatically reduced experimentation although there is renewed interest in a variation on this theme. The idea this time being more about creating clouds than making it rain, the specific clouds are marine stratocumuli, a highly reflective cloud which would reflect sunlight back into space and potentially mitigate some of the effects of global warming.

Answer 3

What Is Artificial Rain

Answer 4

Artificial Rain is the process of spreading either dry ice or silver iodide aerosol into the upper part of cloud try to stimulate the precipitate and form rain .

Answer 5

Artificial rain is not a natural rain that pulled from the sky but man made rain.