This year, there are a lot fewer sandstorms in our north, okay!

Experts explain: Due to the influence of cold winds from Eurasia and cyclone activity on the Mongolian Plateau this year, strong winds brought sandstorms into Beijing after passing through the western desert region. <>

First, the maneuver of sand and dust weather

According to statistics, the number of sandstorms this year is the highest since 2013. After the first time, although the main body has been moved out, because the wind direction is southwesterly, through the wind whirlwind, the surrounding sand and dust have flowed back to the original place, so it has formed many sandstorms in Beijing.

And this spring, the temperature on the northern Mongolian Plateau is high, coupled with less rain, relatively dry, so under the influence of the low-pressure system, the air flow has produced a cyclone phenomenon in a large area in the north, so until the 6th of this month, the dust weather fell on Beijing again. <>

2. The formation of sandstorms

We all know that the geographical environment of Northwest China is dominated by yellow sandy land, such as the Taklamakan Desert and the Tengger Desert.

Because the principle of air temperature and pressure allows the air to flow, there will be wind, and the wind source will come from all directions. There are many alpine waters in the southern part of our country, which are covered by a large amount of vegetation, and naturally there is no large area of dry sand environment, so once the southeast wind blows, there will be absolutely no sandstorms. However, there are large deserts and vast plains in the northwest of our country, the wind comes from the northwest, without the obstruction of the high mountains, the wind flow rate is higher, the wind is stronger, after passing through the desert, the sandstorm weather that is often encountered in the northwest region is formed, and it is <>

3. Protection and prevention

According to the forecast of the Meteorological Observatory, the cold air in Eurasia is active and continues to move southward, and there will be windy weather coming westward, and it is likely that it will still be accompanied by sand and dust. Remind all major departments to do a good job of prevention, and call on citizens to pay attention to the safety of doors and windows, take protective measures when going out, and wear masks, glasses and other dust-proof supplies.

In the past few decades, due to the development of industry, the vegetation in many areas has been destroyed, and the sand has increased, so the sand and dust weather has also fallen frequently. However, in recent years, ** began to plant trees to restore the oasis on a lot of desertified land, one of the projects is to solve the problem of sand and dust, so in recent years, the sandstorm weather has been much less than in the past few decades, this time it is also the first time since 2013 that more frequent sandstorm weather, due to a variety of factors, this is inevitable, what we can do is to continue to work hard to speed up the prevention and control of sandy land, and create a better living environment for the future.

This is because there may be some environmental deterioration in Inner Mongolia this year, so it will affect our country.

This year's drought in the north, coupled with frequent strong winds and heavy dust from neighbouring countries, can lead to severe sandstorms.

Data from meteorological analysts from Zhongtianwang and Public Service Center pointed out that this spring (March-May 6), compared with the average of the year (2000-2020 average), is actually not more, the average number of sand and dust weather in March is second, but this year is 3; The average number of dust days in April is secondary, but this year it is twice; The average number of dust days in May is the second time, but this year it is twice, which is actually lower than the average, which is still a relatively normal situation.

It is because the precipitation in Inner Mongolia this year is relatively small, and the temperature is particularly high, and the cold air is active and frequent now, so it will cause so much sand and dust.

Some meteorological experts said that this year, due to the scarcity of precipitation and high temperatures in Mongolia, the permafrost melts during the frequent cold air activities, coupled with the scarcity of vegetation on the ground, it is easy to form floating soil.

Because the weather is very bad this year, and the climate is relatively unstable this year, there will be a lot of sand and dust.

This is because the environmental pollution is getting worse and worse, and the amount of sand and dust is also relatively large, and then it has also been affected by Mongolia.

The reason for the sandstorms in the north of China in spring is that there is too much geothermal energy in the north.

Dust storms 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. Among them, sandstorm refers to the sandstorm formed by strong winds blowing a large amount of sand into the near formation; A dust storm is a storm formed by high winds that sweep large amounts of dust and other fine particles into the air.

Sandstorm is a common disastrous weather phenomenon in spring in northern China. The root cause of dust storms is the dry climate, which has been exacerbated to a certain extent by human activities interfering with the characteristics of the land surface. Sandstorms in our country mainly occur in the northern region.

The causes of sandstorms are: the dust material on the ground, which is the material basis for the formation of sandstorms. Strong winds are the power basis for the formation of sandstorms, and they are also the power guarantee for sandstorms to be transported over long distances.

Unstable air conditions, which are important local thermal conditions. Sandstorms mostly occur in the afternoon and evening, which shows the importance of local heat preparation conditions.

The natural conditions for the formation of sandstorms

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. Strong wind is the driving force of sandstorms, and the sources of sand and dust are the material basis of sandstorms, and unstable thermal conditions are conducive to the increase of wind and the development of strong convection, so as to entrain more sand and dust and roll higher.

In addition, the drought and lack of rain in the early stage, the warming weather and the rising temperature are the special weather background formed by sandstorms. The convective cells before the surface cold front are only destroyed and developed into clouds or squall lines, which are small and medium-scale systems that are conducive to the development and strengthening of sandstorms. The topographic conditions that are conducive to the increase of wind speed, i.e., the narrow tube action, are one of the favorable conditions for the formation of sandstorms.

The above content refers to Encyclopedia - Sandstorms

For a period of time, sandstorms in northern China can be said to be very common. For the serious desertification in the north of our country, due to indiscriminate cutting and other reasons, soil erosion is also quite serious, because of the serious soil erosion during this time, so it has caused the frequent occurrence of sandstorms in China for a considerable period of time. China has seen the harm of this phenomenon to our country, and has also realized that China's ecological environment is facing serious problems, and relevant departments have taken active environmental protection measures.

Later, with the completion and expansion of the Three-North Shelterbelt, the construction of relevant protected areas, and the continuous improvement of people's awareness of environmental protection, and some other environmental protection measures are being carried out. The phenomenon of sandstorms in northern China is no longer so frequent, and the existence of sandstorms in North China is almost invisible.

However, after many years, the sandstorm struck again, this time sweeping almost all parts of North China, Northwest and Northeast China and Inner Mongolia. And the visibility of this sandstorm is very low, the visibility is less than 500 meters. The area of the sandstorm has reached 10,000 square kilometers, and it can be said that this sandstorm is the strongest sandstorm in China in 10 years.

How are sandstorms formed? Let's take a look.

1. Causes of sandstorms:

What to say about this sandstorm, the main origin is from Mongolia, it is the cyclone in Mongolia that has developed to a certain extent, it can be said that the cyclone has been quite strong, and then these sandstorms with the cold air brought by the Mongolian cyclone, from the east of Mongolia began to go south, if Mongolia develops to the south is the north of our country, and at this time when the temperature in the northern cities of our country is high, and the cold air brought by Mongolia to the south is encountered, then this condition is terrible, These conditions are just right for the formation of high winds and sandstorms. Moreover, it is now the alternation of winter and spring in the north of our country, the rainfall has not increased and is relatively scarce, and the soil moisture is not so high, which is more conducive to the formation of sandstorm weather.

The second reason is that although the ecological environment in northern China has been improved to a certain extent, there is still a large amount of desertified land in the north, and the vegetation is not completely covered, so the sand is not fixed.

2. Summary:

Although the sandstorm covers a wide area, involving North China, Northeast and Western China, Northwest China, and Inner Mongolia, it will not form a normal situation. So people don't have to worry either.

First, it is affected by the underlying surface conditions, and the thermal conditions are good. In the early stage, the temperature in Mongolia and the northwest of China was obviously high, the precipitation was less, the surface gradually thawed, and the dust particles were easy to sand. Second, under the influence of the strong Mongolian cyclone, the dynamic conditions are sufficient.

Wind gusts of 9-11 have occurred in northern Xinjiang, central and western Gansu, Inner Mongolia, and even northern North China, which provides very good dynamic conditions for the occurrence of this sand and dust weather.

This time, the sandstorm came from Mongolia, and the recent rainfall in the north was too little and the weather was very dry, so it was very badly affected.

In spring, the weather is dry and windy, the temperature in the northwest of China is bright and high, the precipitation is less, the surface is slowly thawed, the ground is easy to sand, and the aerodynamic conditions are sufficient under the influence of the strong Mongolian cyclone.

It is because Mongolia has been affected by very serious sandstorms, and many areas in northern China have also been affected to varying degrees.

Personally, I think it's just one of the main causes of sandstorms, which is caused by the extreme climate and low rainfall in Mongolia during this time.

The sandstorm was blowing from Mongolia, and the desertification of the Mongolian land was severe, and the Siberian wind blew the sand over to China.

Mainly due to the impact of a strong cyclone in Mongolia, the dust has already had a serious impact on Mongolia, and China has also been affected.

I think it should be that the anti-sand forest has not played a big role, and the environmental protection is not doing a good job now, we should plant more trees to change the current environment.

It seems that the sandstorm was caused by the winds blowing in Mongolia, and I told us that we should plant trees.

When it comes to the causes of sandstorms, there are many complexities and factors. The driving force of a sandstorm is the wind. The material basis is sand and dust.

Wind and sand have their own complex and diverse temporal and spatial variations. There is a strong enough wind, and there is also a sufficient amount of sand and dust. But blowing up a lot of sand and dust also requires a lot of conditions.

In the arid region of northwest China, strong northwest winds prevail. As a result of the uplift of the ancient Mediterranean, a large amount of soft sand and dust was formed. Drought and lack of rain vegetation sparse, especially drought, strong wind, and sparse vegetation all occur in spring, so spring has the natural conditions for the occurrence of sandstorms, coupled with human activities to destroy the ground vegetation, making sandstorms more and more intense.

On March 15, the ** Meteorological Observatory upgraded the sandstorm warning to a yellow warning, and 12 provinces, including Xinjiang, Inner Mongolia, Gansu, Ningxia, Shaanxi, Shanxi, Hebei, Beijing, Tianjin, Heilongjiang, Jilin, and Liaoning, had obvious sandstorm weather, and there were sandstorms in some areas.

Recently, for the first time in northern China, a large-scale sandstorm occurred, and yellow warning signals were issued in various places, and residents should pay attention to carrying masks, gauze towels and other dust-proof supplies to avoid damage to the eyes and respiratory tract caused by sand. Sandstorm weather mainly occurs in winter and spring, which is due to the lack of precipitation in the dry area in winter and spring, the surface is abnormally dry and loose, and the wind erosion resistance is very weak. Sandstorms are one of the major disastrous weather events affecting northern China.

In addition to the impact of sandstorms on the environment and our daily life, the harm to the human body is also very great: 1. Sandstorms are mixed with a large amount of particulate matter, which can be deposited in various organs of the human body and cause diseases. 2. Sandstorms are mixed with a large number of pollen and other allergens, which can cause allergic symptoms.

3. Sandstorms are also mixed with a large number of bacteria and viruses, which are easy to invade the human body. 4. Sandstorms can affect the radiation intensity of ultraviolet rays. Fifth, it has a negative impact on people's psychological aspects.

A large part of the cause of dust storms is the overexploitation of natural resources, excessive deforestation, and over-clearing of land due to population expansion. Therefore, if we want to reduce the occurrence of sandstorms, we must also actively take preventive measures: 1. Strengthen environmental protection.

2. Restore vegetation and strengthen the biological protection system to prevent wind-blown sandstorms. 3. Formulate plans for disaster prevention, disaster resistance, and disaster relief in accordance with 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 point, so as to further improve the regional comprehensive defense system. Fourth, control population growth, reduce the pressure of human factors on the land, and protect the environment.

Fifth, strengthen the occurrence of sandstorms, the relationship between harm and human activities to popularize science, so that people realize that once the environment they live in is damaged, it is difficult to recover, not only aggravating sandstorms and other natural disasters, but also forming a vicious circle, so people should consciously protect their living environment.