There is always a sandstorm in spring. How are sandstorms formed?

What is the cause of dusty weather? Before and after the fierce Tomb-Sweeping Day, China has started to break out with varying degrees of dust weather, especially in the northwest, where dust is rampant. Then, why are the weather such as dust and floating dust easy to appear every year? What causes the dusty weather in spring? Let's see how dust is formed.

How to form dust

Causes of dust weather

Weather conditions favorable to wind or strong wind, distribution of dust sources and favorable air instability conditions are the main reasons for sandstorms or strong sandstorms.

Strong wind is the driving force of sandstorm, and the source of sandstorm is the foundation of sandstorm. Unstable thermodynamic conditions are conducive to the increase of wind power and strong convection, thus carrying more dust and squeezing higher.

In addition, the last time lasted for a short time, the weather turned warmer and the temperature rose, which was the special weather and climate background for the formation of sandstorms.

Before the ground is cold, convective cells develop into clouds, or Hummer line is a small and medium-sized system, which is conducive to the distribution and strengthening of sandstorms; Terrain conditions favorable to wind speed and suspension effect are one of the advantages of Lengyan Jing.

Experts have found that soil wind erosion is the main link in the formation of Shas wind. Wind is the most direct driving force in soil, among which air quality, wind speed and wind effect are the most important factors in the process of soil wind erosion. In addition, soil water content is also one of the important reasons that affect soil wind erosion.

Therefore, experts have proved that plant measures are one of the effective methods to prevent sandstorms. Experts believe that plants usually affect wind erosion: the amount of air on the ground reduces the transfer between airflow and dust; Protect against soil, dust, etc.

Causes of frequent sandstorm weather in spring

When the sandstorm weather reaches a certain level, sandstorms and sandstorms are disastrous weather, which are more common in northern China. The root cause of sandstorm is the dry climate, and human activities have aggravated the seriousness of the problem to some extent.

The formation of sandstorms requires three basic conditions: first, there must be a sinking garden; The second is that the sand will be loose; The third is the invasion of strong cold air, that is, the circulation conditions that produce strong winds.

Sandstorm is a kind of high-intensity sand disaster, not in all places with natural gas, but in those areas with sparse climate and population. In the northwest of China, the forest coverage rate is not high, and some excessive explosive mining has destroyed the sandstorms in these areas.

Sandstorms are sandstorms and dust storms (sandstorms)

The two kinds of meditation mentioned above blow a lot of dust on the ground, involving air, which is particularly turbid and the horizontal visibility is less than one kilometer. Among them, sandstorm refers to the wind blowing a lot of sand to the nearby sand; Dust storm is a kind of storm, and the wind blows a lot of dust and other particles into the sky.

& lt/p & gt； How to protect against dusty weather?

First of all, dust is the most harmful to human body, and asthma is the most common. In dusty weather, if wet towels must be used, protect your eyes and mouth with wet towels. You should drink more water and eat more light food.

Sandstorm weather is also easy to cause dry eyes, causing discomfort of sand powder, suspended particles and microorganisms, thus causing eye allergies or infections. The most effective protective measure is to wash your hands, and wearing sunglasses can also help to resist sandstorms and prevent direct eye contact. In this weather, you can consider wearing less contact lenses. If your eyes come into contact with dust, close your eyes and drain them with tears. If the tears are insufficient, you can contact your eyes and wash them with normal saline. Don't rub your eyes, it will cause conjunctivitis and other injuries.

In addition, windy and dusty weather can also lead to allergic otitis media, ophthalmia and skin allergies. It is reported that because spring is the season of climate change, with the increase of climate, dust and bacteria, sensitive substances will float with the spring breeze, and people will be allergic to the human body with breathing. Skin metabolic source. If you have skin allergies, don't use your hands or drugs, especially on your face, so as not to cause skin infections or other side effects and affect your face. It is best for patients to receive treatment in general hospitals.