How to do artificial rainfall, how to artificial rainfall

The water in the sky is really lowered to the ground and does not let it run in vain, which is artificial rainfall, but the more scientific name is artificial rainfall, and there are two methods of air and ground operation.

Aerial operations are the use of aircraft to spread catalysts in the cloud. Ground operations are carried out using anti-aircraft artillery and rockets launched from the ground. The cannonball is in the clouds**, and the silver iodide in the cannonball is burned into smoke and scattered in the clouds.

After the rocket reaches the height of the clouds, the silver iodide begins to ignite, and as the rocket flies, smoke is scattered along the way. Stable weather is generally chosen for aircraft operations to ensure safety. Generally, anti-aircraft artillery and rocket operations are more extensive.

2. Conditions for artificial rainfall.

Artificial rainfall must have sufficient conditions. The generation of general natural precipitation not only requires certain macro weather conditions, but also needs to meet the microphysical conditions in the clouds, such as: there must be large water droplets in warm clouds above 0; There must be ice crystals in the cold clouds below 0, without this condition, no matter how good the weather situation is, no matter how good the cloud conditions, it will not rain.

However, in natural circumstances, such microphysical conditions are sometimes not available; Sometimes it is available, but it is not sufficient. The former does not produce precipitation at all; In the latter, there is very little rainfall. At this time, if artificial ice cores are artificially sown into the clouds, the ice-water transformation process of condensation or condensation will occur in the clouds, and then with the help of the natural collision process of water droplets, rainfall can be produced or the amount of rain can be increased.

The role of catalysts in clouds is, to use a less precise analogy, like salt brine tofu, which enables precipitation that would not have been produced to increase the intensity of precipitation that has already been produced.

3. Artificial rainfall is harmless to people.

The principle of artificial rainfall is to make the volume of water droplets in the cumulonimbus cloud larger and fall down, and the anti-aircraft artillery artificial rain is to shoot the cannonball containing silver iodide into the 4000 to 5000 meters above sea level with a large number of cumulonimbus clouds, and the silver iodide spreads at high altitude and becomes the condensation nucleus of the water droplets in the cloud, and the water droplets quickly condense around it to reach a certain volume and then land. When silver iodide is transported by artillery shells into the air, it diffuses into small particles that are difficult to distinguish with the naked eye.

Compared with the huge amount of water droplets, the silver iodide rising into the sky is only a drop in the ocean, too much will not only not increase the rain but will "scare away" the cumulonimbus clouds, so in such a disparity situation, people will never feel the existence of silver iodide.

In addition, the shrapnel of the artillery shell will turn into less than 30 grams after the high altitude, or even only two or three grams of debris to land on the ground, and the area where it falls is no man's land that has been tested and measured before, and will not cause harm to the human body.

How exactly is "artificial rainfall" done? After reading the knowledge, the power of science and technology is really great.

Cold cloud catalysis: The concentration of ice crystals in the natural cloud is sometimes insufficient to conceal, so it is necessary to introduce artificial ice cores to change the microstructure of the cloud, promote the precipitation process of cold clouds, and increase the precipitation. Power Catalysis:

The latent heat released by cold cloud catalysis will change the macrodynamic process of cumulus clouds and increase precipitation. The velocity of the updraft in cumulus clouds is mainly determined by the buoyancy caused by the temperature difference between the inside and outside of the clouds. <

1. Cold cloud catalysis: The concentration of ice crystals in natural clouds is sometimes insufficient, so it is necessary to introduce artificial ice cores to change the microstructure of the clouds, promote the precipitation process of cold clouds, and increase the amount of precipitation.

2. Dynamic catalysis: A large number of ice crystals are generated in the cloud through cold cloud catalysis, and the latent heat released will change the macroscopic dynamic process of cumulus clouds and increase precipitation. The velocity of the updraft in cumulus clouds is mainly determined by the buoyancy caused by the temperature difference between the inside and outside of the clouds.

3. Warm cloud catalysis: In warm clouds with temperatures higher than 0°C, precipitation is mainly developed during the collision of cloud droplets. The larger the cloud droplet, the less fast it will bump and grow. Calculations show that when the radius of cloud droplets exceeds millimeters, they can quickly merge and grow into raindrops.

Rain is in the sky silver imitation ants, not artificially rained, human beings just help cloud droplets or ice crystals to increase to a certain extent, fall to the ground, form precipitation, so it should be called artificial rain.

Artificial rain enhancement is to send a rain enhancement catalyst into the clouds through rockets and other means of transmission, so that more moisture in the clouds will become raindrops and fall. In fact, if you want to succeed in artificial rainfall, there must be certain conditions, there must be clouds in the sky, if it is a cloudless sunny weather, even if you put rain rockets below, it is useless, and the rain still can't fall. So in summary, artificial rain enhancement does not actually produce rain, but only buries the potential rain front, so that it has enough weight to fall to the ground.

Artificial rainfall is based on the physical characteristics of different clouds, choose the right time, use airplanes, rockets to sow dry ice, silver iodide, salt powder and other catalysts into the clouds, so that the clouds precipitation or increase the amount of precipitation, so as to relieve or alleviate the drought of farmland, increase the irrigation water or water supply capacity of reservoirs, or increase the amount of power generation.

Artificial rain enhancement is the original rain that makes the rain heavier, while artificial rainfall is the original no rain and makes the sky rain.

The required conditions are as follows:1. There should be sufficient water vapor in the cloud.

2. There should be an appropriate number of condensation nuclei.

There are two main catalysts used in artificial rainfall in China: one is dry ice, which cools the surrounding air layer to tens of degrees below zero when vaporized, thereby causing the condensation of water droplets; The second is silver iodide, which is extremely toxic. Silver iodide is very efficient in making ice crystals, and usually a cumulonimous cloud can be effective by spreading a dozen or dozens of grams, and the amount of ice is very low, so it does not cause any pollution.

Artificial rainfall is mainly caused by artificially injected dry ice.

Artificial rainfallArtificial rainfall is very similar to natural rainfall in that it relies on water vapor condensing in clouds and eventually falling. It's still artificial rainfall, but it's one more step than natural rainfall, which is to add a catalyst to the clouds and let them gather together to form a rainfall phenomenon. Artificial rainfall naturally needs water, and there must be water-rich clouds at a certain height; Second, the temperature needs to plummet so that the water in the clouds condenses into rain.

Artificial rainfall simply takes away a lot of heat instantaneously when dry ice sublimates, lowering the ambient temperature and turning the clouds into rain.

The principle of artificial rainfall is to use certain means to spread catalysts for experiments, so as to increase the number of condensation nuclei in the cloud, change the temperature in the cloud, disturb and produce convection, so as to achieve the purpose of rainfall. In general, natural precipitation requires not only some macro-weather conditions, but also micro-physical conditions in the clouds. For example, there must be large water droplets in warm clouds above zero; The ice crystals must be in a cold cloud below freezing.

If the necessary natural conditions cannot be met, it will not rain regardless of the weather and cloud conditions. Therefore, artificial rainfall is chosen when the cloud and precipitation processes are in the developing or persistent phase. According to the experience of scientists, the weather systems suitable for artificial precipitation enhancement are mainly cold front weather, northeast cold vortex and shear line.

At this time, the clouds are thicker and there is a continuous rising airflow, which is conducive to artificial rain enhancement and artificial rainfall. The main technology of rainfall is to catalyze local atmospheric clouds through special transmission means such as aircraft, artillery, and rockets, so that more water in the clouds becomes raindrops.

Artificial rainfall is costly, even a complete waste of resources and a loss-making business. However, this is also a helpless situation. After all, it would be better if it could be solved with money than a drought.

It is understood that artificial rain enhancement has been implemented in Shanghai, China, and the cost has reached 4.7 million yuan at that time. The catalyst required for rainfall accounts for nearly 1 10 of the cost. Good steel is used on a knife edge, and in the arid-stricken agricultural provinces, the cost is terrible.

Of course, crops are very important. Therefore, China has been a small-scale peasant economy since ancient times, and now it tends to the common development of various economies, but agriculture still occupies an important part. In other words, if the crops die, what should the Chinese eat?

Therefore, no matter how you burn money, artificial rain should still be done!

Artificial rainfall uses the physical principles of clouds and precipitation to spread rainfall agents (salt powder, dry ice or silver iodide, etc.) into the clouds, so that cloud droplets or ice crystals increase to a certain extent and fall to the ground to form precipitation, also known as artificial precipitation. Methods of spreading include aircraft scattering in the clouds, anti-aircraft guns or rockets shooting silver iodide shells into the clouds**, and burning silver iodide flames on the ground. It is the most widely conducted weather modification experiment.

The microphysical process of artificially influencing clouds can make clouds that could not precipitate naturally under certain conditions be stimulated and precipitated, and can also make those clouds with more water and often able to precipitate naturally, improve the precipitation efficiency and increase the amount of precipitation. However, clouds that cannot be naturally precipitated have less water, so the economic value of artificial catalysis is limited.

According to the principle of precipitation formation in nature, artificial rainfall artificially supplements some necessary conditions for the formation of precipitation, and promotes the rapid condensation or collision of cloud droplets and increases into raindrops and falls to the ground.

Subheading: Artificial rain is the projection of silver iodide shells into the clouds by airplanes, anti-aircraft guns or rockets**, and the burning of silver iodide flames on the ground. It is an anti-aircraft gun specially developed for rainfall.

The contents of the shells are salt powder, dry ice, or silver iodide, etc.

According to the physical characteristics of different clouds, choose the right time to use airplanes and rockets to sow dry ice, silver iodide, salt powder and other catalysts into the clouds, so as to make the clouds precipitation or increase the amount of precipitation, so as to relieve or alleviate the drought of farmland, increase the irrigation water or water supply capacity of reservoirs, or increase the amount of power generation.