Cloud introduction:
Cloud is a visible polymer floating in the air, which is condensed by small water droplets or small ice crystals liquefied by water vapor in the atmosphere when it is cold.
Clouds are the tangible result of the huge water cycle on the earth. The sun shines on the surface of the earth, and water evaporates to form water vapor. Once the water vapor is supersaturated, water molecules will gather around the dust (condensation nuclei) in the air.
The resulting water droplets or ice crystals scatter sunlight in all directions, thus forming the appearance of clouds. Moreover, clouds can form various shapes, and they are divided into many kinds because of their different heights and shapes in the sky.
Formation mechanism:
The water on the ground absorbs heat and turns into steam, which rises to the upper layer of the steam layer in the sky. Due to the lower temperature of the upper steam layer, the steam volume decreases, the specific gravity increases and the steam decreases.
Due to the high temperature below the steam layer, it absorbs heat in the process of falling, rises and then falls when it is cold, so the gas volume gradually decreases and finally concentrates at the bottom of the steam layer. A low temperature zone is formed at the bottom, and water vapor is concentrated in the low temperature zone, forming a cloud.
Impact:
Clouds absorb heat from the ground and reflect it back, which helps to keep the earth warm. However, clouds also reflect sunlight directly back into space, which has a cooling effect. Which effect is dominant depends on the shape and location of the cloud.
In the atmosphere more than ten kilometers from the ground, the closer to the ground, the higher the temperature and the richer the air; The higher the altitude, the lower the temperature and the thinner the air.
On the other hand, the water surface of rivers, lakes and seas, as well as the moisture of soil, animals and plants, evaporates into the air and becomes water vapor. After water vapor enters the atmosphere, it turns into clouds to cause rainfall, or condenses into frost dew, and then returns to the ground, permeates the soil or flows into rivers, lakes and seas. Later it will evaporate (vaporize) and then condense (condense) and drop. It goes on and on.
Gao Yunzu:
Clouds in high clouds usually have a cloud base height of more than 6000 meters in mid-latitude, which is formed in the colder part of the troposphere. It belongs to three genera, all cirrus. At this height, water will solidify and crystallize, so this group of clouds is all made up of ice crystals. High clouds are generally fibrous, thin and mostly transparent.