What is the main wind direction when sandstorms occur in Beijing in spring? What measures should be taken to reduce the impact of sandstorms on Beijing?

Most of the spring sandstorms in China originated in southern Mongolia and were supplemented and strengthened by sand and dust when passing through northern China. There are relatively few sand sources in China. So Beijing should be influenced by the northwest wind.

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.

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. This experiment also proves that plant measures are one of the effective methods to prevent and control sandstorms. Experts believe that plants usually affect wind erosion in three forms: dispersing certain wind momentum on the ground to reduce the transmission between airflow and dust; Stop the movement of soil, dust, etc. In addition, through experiments, the researchers concluded that 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.

According to the above information, to reduce the impact of sandstorms on Beijing, we should pay attention to soil and water conservation, plant more trees and restore vegetation. Of course, Mongolia should also be called upon to participate in environmental protection, otherwise China's efforts alone will not be enough.

Four lines of defense against sandstorms:

First, establish an ecological barrier mainly based on afforestation in the surrounding areas of Beijing and Tianjin in the north of Beijing;

The second is to build an ecological restoration and protection belt with returning farmland to forests as the core in the central and western parts of Hunshandake, Inner Mongolia;

Thirdly, the Ordos ecological barrier centered on the Yellow River irrigation area and Mu Us sandy land should be built in Hetao and Huangsha areas.

Fourth, establish a long-term cooperation plan framework with Mongolia to prevent and control sandstorms as soon as possible and set up a protective barrier for Mongolia.

Thank you for your concern about the climate in Beijing.

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