202 1 Why is there so much precipitation? Where did so much rain come from? Is there any change in the climate? ,,

Global warming leads to the increase of water evaporation in glaciers, polar regions and oceans, and water vapor forms rainfall through atmospheric circulation. When there is more water vapor, there will naturally be more rainfall. On rainy days, it can only be said that the warm and humid airflow is too strong, and the transit of heavy rain brings lightning all the way.

Rain refers to the weather phenomenon that condensed water vapor in the atmosphere falls to the surface of the earth in different ways.

Almost all water vapor in the atmosphere is concentrated in the troposphere. The higher the temperature, the more water vapor the atmosphere can hold, and vice versa. At a certain temperature, when the air can't hold more water vapor, it is called saturated air.

When the water vapor in saturated air matches the temperature, there will be no water vapor condensation, but when the air reaches the supersaturated state, excessive water vapor will be generated and water vapor condensation will occur.

The formation principle of rainfall, because the water on the earth is irradiated by sunlight, becomes water vapor and is evaporated into the air. Water vapor condenses into small water droplets when it meets cold air at high altitude. These small water droplets are very small, with a diameter of only 0.0 1 ~ 0.02 mm and a maximum of only 0.2 mm ... They are small and light, and are held up in the air by the updraft in the air. It is these small water droplets that gather in the air to form clouds.

These small water droplets will become raindrops and fall to the ground, and the volume will increase by about 1 10,000 times. How did these small water droplets increase their volume to more than 654.38+00,000 times? It mainly relies on two means, one is condensation and sublimation. The second is to rely on the collision and increase of cloud droplets. In the initial stage of raindrop formation, cloud droplets mainly condense and condense themselves by constantly absorbing water vapor around the cloud.

If the water vapor in the cloud can be constantly replenished and replenished, so that the surface of the cloud droplets is often in a state of supersaturation, then this condensation process will continue, making the cloud droplets grow and become raindrops.

However, sometimes the water vapor content in the cloud is limited, and in the same cloud, the water vapor is often in short supply, so it is impossible to make every cloud droplet grow into a larger raindrop, and some smaller cloud droplets have to be merged into a larger cloud droplet. If there are water droplets and ice crystals in the cloud, the process of condensation and sublimation will be greatly accelerated.

When the cloud drops increase to a certain extent, due to the increasing volume and weight of large cloud drops, they can not only catch up with the slower small cloud drops, but also "swallow" more small cloud drops, making themselves stronger. When the big cloud drops get bigger and bigger until the air can no longer hold them, they fall straight from the clouds to the ground and become our common rain.