Dust storm origin, the source of dust storms

First, the place of origin. Sandstorms mostly occur in inland desert areas, mainly in the Sahara Desert, and the central and western parts of North America and Australia are also one of the sources of sandstorms.

2. Reasons. Favorable weather conditions for the generation of high winds or strong winds, favorable distribution of sand and dust sources and favorable air instability conditions are the main reasons for the formation of sand and dust storms or strong sand and dust storms.

3. Measures. 1. Strengthen the protection of the environment and raise the protection of the environment to the level of the legal system.

2. Restore vegetation and strengthen the biological protection system to prevent wind-blown sandstorms. It is necessary to protect and restore forest and grass vegetation in accordance with the law, prevent the further expansion of land desertification, and reduce the source of sand and dust as much as possible.

3. Formulate plans for disaster prevention, disaster resistance, and disaster relief according to local conditions in different regions, actively promote various disaster reduction technologies, and build a number of demonstration projects to gradually promote them from point to area, and 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 scientific popularization of the relationship between the occurrence and harm of sandstorms and human activities, so that people realize that once the environment they live in is damaged, it is difficult to recover, which not only aggravates natural disasters such as sandstorms, but also forms a vicious circle, so people should consciously protect their living environment.

6. Plant plants suitable for growth in desert arid areas, such as sea buckthorn, in desert areas to form a ground cover plant layer, so as to improve the ground cover environment, fix the soil, reduce wind speed, increase air humidity, and improve the microclimate environment.

7. Plant native varieties of low shrubs and small trees at the edge of the desert to improve the distribution of vegetation.

The source areas of sand and dust storms affecting China include both overseas and domestic source areas. The main source areas are Mongolia desert area and Kazakhstan desert area, and the domestic source area mainly includes Inner Mongolia and Xinjiang desert.

The birthplace of sandstorms.

2.Causes of sandstorms.

3.In response to this problem, you.

Sandstorms mostly occur in inland desert areas, mainly in the Sahara Desert, and the central and western parts of North America and Australia are also one of the sources of sandstorms. Dust storms are conducive to the weather situation of high winds or strong winds, and favorable distribution of sand and dust sources and favorable air instability conditions are the main reasons for the formation of sand and dust storms or strong dust storms.

Sandstorm is a general term for sandstorms and dust storms, which are a sign of desertification. It refers to a disastrous weather phenomenon in which strong winds roll up a large amount of sand and dust from the ground, making the horizontal visibility less than 1 km, and having the characteristics of suddenness and short duration. Sandstorms refer to sandstorms formed by strong winds blowing large amounts of sand particles into near-surface formations, while dust storms are storms formed by winds that sweep large amounts of dust and other fine particles into the upper air.

On March 15, 2021, according to the latest satellite monitoring from the National Satellite Meteorological Center of the China Meteorological Administration, sand and dust weather occurred in Inner Mongolia, northern North China, the western part of Northeast China, and the eastern part of Northwest China due to the influence of strong winds behind the frontal cyclonic cloud system.

Sandstorms mostly occur in Northwest China, that is, the surrounding areas of the Tarim Basin, the Turpan-Hami Basin through the Hexi Corridor, the Ningxia Plain to the northern Shaanxi line, and the Alxa Plateau, Hetao Plain and Ordos Plateau in Inner Mongolia. North China, Chifeng, Zhangjiakou area.

Morphological characteristics of sandstorms:

1. The wind and sand wall is towering.

Most of the severe sandstorms on the mainland moved from the northwest or west, and a few from the east. When almost all sandstorms come, we can see black walls of wind and sand moving rapidly in the direction of the wind, getting closer and closer. From a distance, the wind and sand wall is as tall as a mountain, very much like a city wall, and it is the vanguard of the arrival of the sandstorm.

2. It's dark.

When a strong sandstorm occurs, the wind is very strong due to the wind blowing above level 8, which can roll up stones and sand. As more and more sand and dust flew into the air, the dense sand and dust covered the sky, blocking the sun and making it impossible to see anything for a while, as if it were at night.

3. Tumbling and rushing.

When the black wind blows, the air near the ground is very unstable, and the heated air below rises, and the air around it flows to replenish, causing the air to carry a large amount of sand and dust to roll up and down, forming countless dust balls of different sizes in the air.

4. Ambilight.

The upper layer of the aeolian sand wall is often yellow to red, the middle layer is grayish-black, and the lower layer is black. The yellowing and redness of the upper layer is due to the fact that the dust in the upper layer is thin and fine-grained, and the sunlight can almost pass through the dust and shoot down. The lower layer of sand and dust has a large concentration and coarse particles, and almost all of the yang grinding wax light is absorbed or scattered by the sand and dust, so it is black.

Where the wind and sand walls moved, the sky was changing from light to dark.