During the rainy season, I often hear guns rumbling in my hometown, which is to increase rain and prevent hail. In fact, it can also eliminate the rain.
After a long drought, there was rain, and a few guns went up, which immediately brought a timely rain to farmers; Hail is coming, and a few bombardments will make the grapes everywhere no longer chaotic and the grains will not be harvested; Yichun city, Heilongjiang province, continued to artificially increase rainfall to help forest areas extinguish fires; The Olympic Games will also adopt the method of eliminating rain to control the rainfall time.
So how do people affect the weather? Different clouds, different regions, different purposes and different methods.
When the clouds in the air can't have enough precipitation, dry ice, salt or calcium chloride, silver iodide, etc. You can sow seeds in the cloud by plane, rocket, etc. , can enhance artificial precipitation. Coolant, such as dry ice, makes the temperature in the cloud drop significantly, and makes tiny water droplets and ice crystals increase rapidly, forcing them to drop and form precipitation; A coagulant with strong hygroscopicity, such as salt, makes cloud droplets grow into raindrops and fall down; Crystallizers such as silver iodide can produce a large number of artificial ice cores, which can participate in the microphysical process of cloud precipitation under suitable conditions, so that more water vapor and cloud droplets can be transformed into precipitation. There are also powerful shock waves produced by bombarding clouds with soil cannons and soil arrows, which make cloud droplets collide with each other and merge into raindrops to land.
Artificial precipitation enhancement can be divided into "precipitation in advance" and "precipitation suppression". Among them, "early precipitation" refers to artificial precipitation enhancement in the windward side and surrounding areas of the reserve, and the temporal and spatial distribution of rainfall is adjusted so that it does not rain or light rain in the reserve. "Suppression of precipitation" refers to excessive sowing of liquid nitrogen and silver iodide to disperse clouds and weaken precipitation.
Artificial hail suppression means that when the hail cloud appears, it is bombarded with anti-aircraft guns or special soil guns and rockets, and the powerful shock wave generated by explosive explosion makes the hail in the cloud collide with each other, and the big hail breaks into small hail, and the small hail falls and melts into raindrops; Or under the action of shock wave, supercooled water droplets in the cloud (the temperature is below 0℃ and unfrozen raindrops) become ice crystals (supercooled water droplets freeze rapidly when shaken), thus changing the state of ice water, destroying the conditions of hail occurrence, making ice crystals in the cloud fall instead of hail, and achieving the purpose of preventing hail disasters.
Qinhuangdao 10 rockets, 2 rockets from lulong county. In addition, there are 20 anti-hail Sanqi anti-aircraft guns distributed in counties and districts, and there are 2 guns in lulong county.
With the rainy season in Qin city, the meteorological department of Qin city has carried out more than 50 rocket precipitation enhancement operations this year and fired more than 300 rockets; Anti-aircraft guns have been engaged in hail suppression operations for nearly 20 times and fired nearly 600 hail suppression bombs. In Huyuan Village, Caigezhuang, Beidaihe, Duanjiadian, Shanhaiguan and Changli, Mazhuang in Anshan Town, Xiazhai and Mu Jing Township in lulong county, and Guo Chang Village, Shimenzhai, Dashantou, Shuangling and Qinglong in Funing County, more than 40 operating points have been set up to carry out irregular hail suppression and precipitation enhancement operations.
Due to the failure to deploy the attached parachute during the launching of the GRP rocket for rain enhancement and hail suppression, it fell rapidly from a height of 600 meters and finally landed on the roof of a farmhouse in Funing, smashing a big hole. Therefore, the meteorological department appealed that if the people near the job site found the parachute of the rocket and found the wreckage of the rocket and shell with the words of artificial precipitation enhancement or artificial hail suppression, they should not disassemble it themselves and contact the local meteorological department in time to avoid accidents.