The birthplace of sandstorm

Sandstorm weather mostly occurs in inland desert areas, and the main source is the Sahara desert. The midwest of North America and Australia are also one of the sources of sandstorms.

Second, the reason.

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.

Three. measure

1. Strengthen environmental protection and raise it to the height of legal system.

2. Restore vegetation, strengthen biological protection system and prevent sandstorms. Protect and restore forest and grass vegetation according to law, prevent further expansion of land desertification, and minimize dust sources.

3, according to the local conditions in different regions, formulate disaster prevention, disaster prevention and relief plans, actively promote various disaster reduction technologies, and build a model project, and gradually promote it from point to area to further improve the regional comprehensive defense system.

4. Control population growth, reduce the pressure of human factors on land and protect the environment.

5. Strengthen the popular science propaganda on the relationship between the occurrence and harm of sandstorms and human activities, and let people realize that once the living environment is destroyed, it will be difficult to recover, which will not only aggravate natural disasters such as sandstorms, but also form a vicious circle, and people should consciously protect their living environment.

6. Plant plants suitable for growing in desert arid areas, such as Hippophae rhamnoides, to form a ground cover plant layer, thus improving the ground cover environment, fixing the soil, reducing the wind speed, increasing the air humidity and improving the microclimate environment.

7. Plant local low shrubs and small trees on the edge of desert to improve vegetation distribution.

According to historical records, there were 70 sandstorms in China from the 3rd century BC to 2 154 in 949, with an average of 3 1 year. However, since the 1950s, the frequency of sandstorms in China has increased rapidly, and sandstorms in China have shown a new trend of early occurrence and wide influence.

The spatial law of sandstorms in China is that there are more in the west and less in the east, and more in the north and less in the south, mainly concentrated in the arid and semi-arid areas of northwest and north China; Sandstorms happen all year round.

According to Zhao Jingbo's statistics of 494 monthly sandstorms in China, sandstorms mainly occurred in February-May, accounting for 78. 3%, of which March to April is the most frequent, accounting for 49.2% of the total, followed by February and May, and less in other months. The daily variation of sandstorm is mainly concentrated from noon to evening, and it is relatively less from night to noon.

As a country suffering from sandstorms, China has built the largest sandstorm monitoring station in the world. This monitoring station is located in Ningxia, the western province of China, covering an area of 2 square kilometers. It is said that this monitoring station will play an important role in the study of dust and desert.

Baidu encyclopedia-sandstorm