What weather system causes dust storms? Also, is it possible for a warm front to cause a sandstorm?

The weather system that causes sandstorms in our country is the cold front in spring.

China's satellite meteorologists systematically analyzed the six characteristics of sandstorms.

1. Time: The occurrence time of sandstorms in China is mainly from March to April. Taking 2002 as an example, there were 12 sand and dust processes in the country, including 4 strong sand and dust storm processes, all of which occurred in March and April, and the National Satellite Meteorological Center monitored and analyzed all the above processes.

2. Region: The main area of sandstorm occurrence is 110 degrees to 117 degrees east longitude and 38 degrees north latitude, that is, Cangzhou, Hebei Province as the boundary, north to Tianjin, Beijing to Inner Mongolia, west through Shijiazhuang, Yinchuan, Lanzhou, Qinghai Qilian, and north to the border of Inner Mongolia.

3. Source: The main source of sandstorms in China is Mongolia and even the desert areas of Central Asia, and the intensity of such sandstorms is large, and its impact is significantly greater than that of sandstorms in the domestic source areas. The source areas in China are the Hexi Corridor of Gansu, the southern part of Inner Mongolia, the northern part of Hebei and other desert areas.

4. Path: In recent years, especially last spring, there are four main paths of sandstorms affecting Beijing: one is the Mongolia-Inner Mongolia-Beijing northeast path.

The second is the eastward movement of the Hexi Corridor to Beijing. The third is to influence Beijing from the Zhurihe region of Inner Mongolia through the Zhangjiakou area of Hebei Province. The fourth is to affect the Beijing area from the northern Shanxi Plateau to the east.

5. Related factors: Through the preliminary analysis of the main dust processes and related climatic factors in Huahua area since 1998, especially in 2002, namely ground vegetation, snow cover in February, soil moisture of 0-10 cm, and air temperature, it is believed that the dust weather is closely related to the cold air activity in spring, and when the cold air path in spring is westward and southerly, such as April 1999, there is less sand and dust weather in North China, and the main process occurs in Northwest China. On the contrary, when the main force of cold air is easterly and northerly, such as April 2000 and March 2002, the main process occurs in North China.

6. The impact of sandstorms: strong sandstorms not only affect the northwest, north, central and east China, but also can be transported to the northeast if they encounter high-altitude jet stream areas at an altitude of 7-8 kilometers and under the situation of strong development of the cold air vortex in the northeast, affecting the northeast, the far east, and even further north, which is caused by the global atmospheric circulation.

According to the analysis of the prediction of sand flux and dust flux in the numerical prediction experiment of sandstorm weather in China, when the diameter of sandstorm particles is less than 22 microns, it is in good agreement with the ground observation data, and the forecast effect of sandstorm in China is very good. Ground vegetation data and soil types are sensitive to the prediction of sandstorms.

In addition to these three factors, human production activities and other factors are also important for the formation of dust storms.

Sandstorm is a general term for sandstorms and dust storms in Songli, which is a sign of desertification, and refers to a disastrous weather phenomenon with a small probability and large harm caused by strong winds that roll up a large amount of dust from the ground, making the horizontal visibility less than 1 km, and having the characteristics of suddenness and short duration.

Sand-duststorm is a general term for sandstorm and duststorm, which is 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 1,000 band touching meters, and has the characteristics of suddenness and short duration. Among them, sandstorm refers to a sandstorm formed by a large amount of sand particles blown into the near-ground layer by a large amount of hail. A dust storm is a storm formed by high winds that sweep large amounts of dust and other fine particles into the air.

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.

A sandstorm is a weather phenomenon that usually refers to the fact that the dust in desert or semi-arid areas is swept up by the wind due to drought, strong winds, and sparse vegetation on the surface of the ground, forming huge dust storms and drifting with sand particles.

Dust storms usually occur in spring and autumn and occur worldwide, especially in the Middle East, Africa and Asia. Dust storms can have many negative impacts on humans and the natural environment, such as reduced visibility, obstructed transportation, and damaged health.

The causes of sandstorms are: natural rubber parts, physical factors, environmental factors, human factors, and meteorological factors.

1. Natural conditions

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 winds are the driving force of sandstorms, and the source of sandstorms is the material basis of sandstorms, and the unstable thermal conditions are conducive to the development of wind controve, 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 development of convective cells in front of the surface cold front into clouds or squall lines is a small and medium-scale system that is conducive to the development and strengthening of sand and dust storms. 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.

2. Physical factors

Under the conditions of extremely favorable large-scale environment, upper-level dry and cold jet stream, strong vertical wind speed, wind direction shear and thermal unstable stratification, the formation and development of small and medium-scale systems near the front area are caused, which aggravates the pressure and temperature gradients before and after the front area, and forms a huge pressure and temperature gradient before and after the front area.

Under the combined action of momentum downward transmission and gradient deviation wind, the wind speed near the surface rises sharply, raising surface sand and dust, and forming sandstorms or strong sandstorms.

3. Environmental factors

Soil wind erosion is the primary link in the occurrence and development of sandstorms. Wind is the most direct driving force of soil, and the nature of air flow, wind speed, and the relevant conditions of wind during soil wind erosion are the most important factors. In addition, soil moisture content is also one of the important causes of soil wind erosion.

4. Human factors

The occurrence of sand and dust storms is not only a product of specific natural environmental conditions, but also has a corresponding relationship with human activities. Artificial overgrazing, indiscriminate felling of forest vegetation, industrial and mining transportation construction, especially man-made excessive reclamation, destroy ground vegetation, disturb the ground structure, and form a large area of desert trouser rewilding land, which directly accelerates the formation and development of sandstorms.

5. Meteorological factors

The formation of sandstorms is based on the special atmospheric circulation of East Asia and is closely related to the winter monsoon, and the occurrence of Hu Chenghao is mainly related to the transit of cold fronts driven by the high pressure of Siberia and Mongolia in the winter half of the year.

When there is a sandstorm, the wind in the sky will wrap the sand and gravel and float and sink, and these sands and dust will be everywhere, as long as the sandstorm passes through the area, the air is very turbid, that is to say, the sandstorm weather will lead to changes in the ecological environment, which will induce more people to suffer from respiratory diseases. <>

Because sandstorms will carry a lot of sand and gravel, in this way, the whole weather will feel particularly gloomy, and the sun's radiation will also be greatly reduced, and the poor visibility for a long time will make people feel dull, whether it is work or study efficiency will be reduced a lot. In this way, many livestock will suffer from respiratory diseases or gastrointestinal diseases, and even lead to the death of some livestock. In addition, sandstorms will also sweep away the fertile soil of the farmland, as well as the seedlings and seeds in the field, and eventually these sand and gravel will also cover the surface of the soil, which will seriously affect the normal photosynthesis, so it will lead to a large reduction in crop yields.

Sandstorms will also cause loss of life and property, when sandstorms come, many houses will be destroyed, and even some people will be directly swept away by sandstorms, bringing direct and indirect economic losses are very large. <>

When the sandstorm comes, traffic safety is also greatly affected, for example, the plane will not be able to take off or land normally, and some vehicles on land will also be affected, such as cars and trains will stop running. <>

All in all, sandstorms can have a great impact on humans, and sandstorms can cause the collapse of houses, cause the blockage of transportation and power supply, and also cause fires or human and animal accidents. In addition, it can also pollute the environment, destroy the growth of crops in the field, and pose a great threat to the safety of people's lives and property.

Weather forecastThe weather may have a great impact on our eyes, respiratory tract and **, if the sandstorm is relatively large, the dust may enter the eyes, resulting in eye damage, and at the same time, we inhale some harmful particles of sandstorms can also cause bronchitis or other types of respiratory diseases, for ** more sensitive, it will also cause some**, will also cause ** disease.

It is not conducive to people's health, and it will also have a certain impact on people's stomach, and it will also have a certain impact on people's lungs. And it can also cause some people with low resistance to get rhinitis.

Sandstorms will have a lot of hidden hazards, and they will also affect the normal travel of many people, and will also cause many people to not be able to go out to work, and will also cause the ecosystem to be affected, and will also lead to environmental degradation.

It can seriously endanger the lives of pedestrians, because the winds of sandstorms are very strong. Able to blow down billboards on the side of the road and hit passers-by.

First of all, it will affect people's daily travel, work and life, and at the same time will affect the quality of the air, and will also lead to people suffering from respiratory diseases.

Sandstorms will pollute the environment of the city, and there are many billboards on the street, which will be blown off, some accidents will occur, and many innocent people will be hurt at the banquet, and the weather like sandstorms will also have a great impact on people's bodies.

The sandstorm will affect everyone's health, and it will cause some people to not be able to go out, because the sandstorm is unreasonable in Africa, and it will also be particularly cold and round.

One of the most harmful points of sandstorms is that they will cause soil erosion, most of the water sources on the Loess Plateau are due to the sand from the northwest blowing over and precipitating to form hail front crack dunes, which are extremely unstable, and the base ears will collapse when encountering external forces, and sandstorms will also affect local water sources and air quality.

Sandstorms will cause pollution to the air, there are a lot of dust in sandstorms, there are a lot of toxic substances in these dusts, and people's exhalation will be very harmful, and in the spring and autumn collapse season, it will cause people's respiratory tract infections and rhinitis and other diseases to re-age finger round hair, the impact on people's daily travel is also very large, and there is also a very great harm to livestock breeding and cash crops such as crops and fruits, resulting in a large area of production reduction.

Sandstorms will bring certain safety hazards to people's travel, will cause some traffic accidents, and when traveling, they are also susceptible to sand damage, resulting in damage to some buildings and plants.