What is the cause of smog?

Strong wind, strong thermal instability and sand source are the dynamic factors and material basis of sandstorm formation respectively. Natural conditions are conducive to the weather situation that produces strong winds or strong winds, and favorable dust source distribution and favorable air instability conditions are the main reasons for the formation of sandstorms or strong sandstorms. 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, thus carrying more dust and winding it higher.

In addition, drought and lack of rain in the early stage, warming weather and rising temperature are the special weather background for the formation of sandstorms; 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.

The main component of soil and yellow sand is silicate. When there is less rain and the air temperature becomes warmer, the silicic acid on the silicate surface loses moisture, and H2SiO4=SiO3-2+H2O (gas) = In this way, the surface of silicate soil micelles and sand particles will be negatively charged, repel each other, become aerosols, and cannot be gathered together, thus forming sand blowing, that is, sandstorms. Sandstorms are essentially silicate aerosols with negative charges.

In short, the formation of sandstorms needs these three conditions: first, the dust material on the ground. It is the material basis for the formation of sandstorms. The second is the strong wind. This is the dynamic basis for the formation of sandstorms and the dynamic guarantee for the long-distance transportation of sandstorms. Third, the air state is unstable. This is an important local thermal condition. Sandstorms often occur in the afternoon and evening, which shows the importance of local thermal conditions.

The content comes from the Internet. If there is any infringement, please inform us!