Why is there such a big sandstorm in China after so many years of sand control?

Sandstorm is caused by strong wind, intense thermal instability and sand source as dynamic factors and material basis respectively. The weather situation favorable to strong winds or strong winds, favorable distribution of dust sources 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.

Sandstorm refers to the weather phenomenon that strong winds blow up dust on the ground, making the air very turbid and the horizontal visibility less than 1km. Sandstorm is a weather phenomenon in wind erosion and desertification, and its formation is influenced by both natural factors and human activities. Natural factors include strong wind, decreased precipitation and its sand source. Human activity factor refers to the increase of sandstorm frequency after vegetation destruction in the process of economic development.

Sandstorm is a weather phenomenon in which wind and sand interact with each other, that is, the visibility of the atmosphere drops sharply due to the strong wind blowing up the dust on the ground. There are many reasons for the formation of sandstorms, both natural and artificial. Among them, over-exploitation of natural resources, over-logging and over-reclamation caused by population expansion are the main reasons for the formation of sandstorms, which increase the intensity and frequency of sandstorms.