How did the sandstorm weather come about? What is the reason?

1. Natural conditions are favorable for strong winds or strong winds. Favorable dust source distribution and favorable air instability conditions are the main reasons for the formation of dust storms or strong dust storms. 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.

2. Physical factors, under the extremely favorable large-scale environment, high-altitude dry and cold jet, strong vertical wind speed, wind direction shear and thermal instability stratification, cause the generation and development of small and medium-scale systems near the front area, aggravate the pressure and temperature gradients before and after the front area, and form huge pressure and temperature gradients before and after the front area. Under the joint action of momentum downward transfer and gradient deviation wind, the wind speed in the near-surface layer rises sharply, causing dust on the surface and forming sandstorm or strong sandstorm weather.

3. Environmental factors. With the efforts of experts from the Institute of Environment and Engineering in Cold and Arid Regions, Chinese Academy of Sciences, the wind tunnel simulation experiment of sandstorm was successfully completed in order to explore the start and transport mechanism of sandstorm. Experts found through experiments that soil wind erosion is the primary link in the occurrence and development of sandstorms. Wind is the most direct driving force of soil, among which the nature of airflow, the magnitude of wind speed and the related conditions of wind action in soil wind erosion are the most important factors. In addition, soil water content is also one of the important reasons that affect soil wind erosion.

4. Human factors, the occurrence of sandstorms is not only the product of specific natural environmental conditions, but also has a corresponding relationship with human activities. Man-made overgrazing, deforestation, industrial and mining traffic construction, especially man-made over-reclamation, destroyed the ground vegetation, disturbed the ground structure, formed a large area of sandy land, and directly accelerated the formation and development of sandstorms.

5. Meteorological factors: The formation of sandstorms is based on the special atmospheric circulation in East Asia, which is closely related to winter winds. Its occurrence is mainly related to the cold front crossing driven by Siberian-Mongolian high in winter, which belongs to cold front sandstorm.