Why do sandstorms often occur in spring? What should I do if I encounter a sandstorm?

Sandstorm is the general name of sandstorm and dust storm, which refers to a disastrous weather phenomenon in which strong winds roll up a lot of dust from the ground and make the horizontal visibility less than 1 km. It has the characteristics of suddenness, short duration, low probability and great harm. Sandstorms often occur in spring. We should understand the necessary conditions for the formation of sandstorms and what measures we should take to protect our bodies from harm when encountering sandstorms.

Sandstorms often occur in spring, when cold air and cyclones are frequent, and the accompanying strong wind is the starting factor of sandstorms. The dry and rainy climate in spring has caused the soil to be loose, which has the material basis of sandstorm; When there are few clear clouds, the sun is strong, and the surface gas layer is heated around noon, which is in a state of thermal instability, which is conducive to the development of air convection and the exchange of momentum and energy, so that the dust particles in the atmosphere are lifted higher and spread faster. Therefore, in spring, especially in the afternoon to evening in spring, sandstorms often form.

The conditions for the formation of sandstorms mainly come from the following aspects: first, natural aspects; Strong wind is the driving force of sandstorm, and the source of sandstorm is the material basis of sandstorm. Unstable thermal conditions are conducive to the increase of wind power and the development of strong convection, which makes the wind speed in the near-surface layer rise sharply, sets off dust on the surface, and forms sandstorm or strong sandstorm weather. Followed by climate; Drought, lack of rain, warming weather and rising temperature are the special weather and climate background of sandstorm formation; The convective cells before the ground cold front develop into clouds or squall lines, which is a small and medium-sized system conducive to the development and strengthening of sandstorms. The topographic condition conducive to the increase of wind speed, that is, the narrow tube effect, is one of the favorable conditions for the formation of sandstorms. Finally, on the human side, human overgrazing and deforestation, industrial and mining traffic construction, especially human overgrazing, destroyed the ground vegetation, disturbed the ground structure, and formed a large area of desertified land, which directly accelerated the formation and development of sandstorms.

How to protect yourself in case of sandstorm? Sandstorm is coming, we should protect our health from the following aspects; 1, try to stay indoors and close the doors and windows. Especially the elderly and infants with low resistance. 2. If necessary, you must exercise outdoors and try to avoid cycling. You can protect your eyes and mouth with wet towels and gauze towels. It is best to wear dust-proof clothes, gloves, masks, glasses and other items. 3. If you are outdoors, stay away from trees and billboards, squat on a solid low wall that can block the wind and sand, lie on the leeward side of a relatively high slope, or grab a solid object. 4. In case of chronic cough with expectoration or shortness of breath, paroxysmal dyspnea and chest pain, you should see a doctor as soon as possible.