人工落雨就是依据天然界落水构成的道理(国外英语资料).doc

人工降雨就是根据自然界降水形成的原理(国外英语资料) Artificial rainfall is formed according to the principle of natural rainfall, artificial rainfall must be formed by adding some conditions, prompting rapid condensation or merging droplets increases, the formation of precipitation. The methods adopted are different because of the different nature of clouds: (1) artificial influence of cold cloud precipitation; Large areas of supercooled stratiform clouds often occur in winter in mid latitude regions, but few precipitation occurs. In summer, cloud like clouds with cloud top height above 0 are often observed, and few of them can produce precipitation. According to the begiron theory, the cloud is not rain, is mainly the lack of cloud ice, cloud is not growth. The basic principle of cold cloud precipitation is trying to destroy the structure of the cloud, that is the right amount of manufacturing ice in the cloud, the ice crystal effect, the droplet evaporation, crystal growth. When the ice crystals grow up to a certain scale, settlement along the way because grows and sublimation and precipitation particle large drop, this is the so-called static cold cloud catalytic. In 60s, a dynamic catalytic test was carried out, which was based on the introduction of artificial ice nuclei rapidly and rapidly in the supercooled part of the clouds (-10 DEG C). When the ice into the ice, to release a large amount of latent heat, the cloud temperature, formation or enlargement of updraft, promote rapid development of cloud in the vertical and horizontal direction, the life extension of the corresponding cloud, cloud accelerated the formation of precipitation process, thereby increasing precipitation. The static and dynamic catalytic catalysis are started from effects of cloud microphysical structure, which is different in the static phase catalytic focus on the instability of cloud water, based on the dynamic catalytic effect or strengthen cloud thermodynamic instability. In the method of artificial ice cl