What are the causes of sandstorms and what are their effects?

Due to the winter and spring seasons, there is generally little precipitation in arid areas. Moreover, the surface is extremely dry and loose, and the wind erosion resistance is also very weak. Therefore, when there is a strong wind blowing, a lot of dust will be involved in the air, forming sandstorm weather. The formation of sandstorm requires three necessary conditions: dust material, strong wind and unstable air state.

Characteristics of sandstorm 1. The sandstorm wall stands tall.

Most of the strong sandstorms on the mainland come from the northwest or west, and a few from the east. When almost all sandstorms come, we can see a black sand wall moving rapidly and getting closer and closer in the direction of the wind. Seen from a distance, the sandstorm wall is towering like a mountain, much like a city wall, and it is the sandstorm Depth Charge.

2. The sky is dark

When a strong sandstorm occurs, due to the strong wind of magnitude 8 or above, the wind is very strong and can roll up stones and sand. As more and more dust flies into the air, the thick dust is overwhelming, blocking the sun and making people see nothing for a period of time, just like at night.

Rolling and running

When the black wind blows, the air near the ground is very unstable. The heated air below rises and the surrounding air flows to supplement it, which makes the air roll up and down with a lot of dust, forming countless dust clouds of different sizes to meet and rush in the air.

4. smart

The upper layer of sand wall is often yellow to red, the middle layer is gray-black and the lower layer is black. The reason why the upper layer is yellow-red is because the dust on the upper layer is so thin that sunlight can almost shoot down through the dust. The dust in the lower layer has a large concentration and coarse particles, and the sunlight is almost completely absorbed or scattered by the dust, so it is black. Where the sand wall has moved, the sky is flickering and changing. This is caused by light passing through dust belts of different thickness and consistency.

The influence of sandstorm;

1, sandstorm will cause smoke and dust, and carry bacteria into human body, which will endanger people's health and even cause death.

2. Sandstorms in the form of sandstorms have caused farmland, channels, cottages, railways and grasslands to be buried by a large number of quicksand, especially posing a serious threat to transportation.

3. Sandstorm will affect the traffic safety, which will cause the plane to fail to take off or land normally, and cause the glass of cars and train carriages to be damaged and stopped.

4. Sandstorm has caused long-term and potential harm to agricultural production, which will scrape away the topsoil on which crops depend, and the barren land will seriously affect crop yield.

Benefits of sandstorm:

1. Dust storms can reduce the occurrence of acid rain, because the dust is rich in alkaline cations such as calcium, and these foreign dust and alkaline dust raised on the ground can effectively neutralize acid rain.

2. Dust particles in sandstorms are rich in nutrients necessary for marine life, as well as iron and phosphorus that are often lacking in seawater, thus contributing to the growth of marine life.

3. The dust particles in the sandstorm are not round and the surface is uneven. Such particles are very conducive to the condensation of water vapor in the air, resulting in rainfall.