Evaluate the advantages and disadvantages of sandstorms on the geographical environment

The most direct disadvantage: environmental pollution, affecting travel.

The most direct advantage: Japan, South Korea, Hawaii are beneficial, what these island countries lack is land resources, Japan and South Korea are the most direct beneficiaries, you can ask your geography teacher, at the beginning, I raised this question, my geography teacher was impressed with me

There are six conditions for the formation of sandstorms.

1. The sand and dust material on the ground, which is the material basis for the formation of sand and dust storms.

2. Strong wind, which is the power basis for the formation of sandstorms, is also the power guarantee for sandstorms to be transported over long distances.

3. Unstable air condition, which is an important local thermal condition, and sandstorms mostly occur in the afternoon and evening, which shows the importance of local thermal conditions.

Fourth, the arid climate environment, sandstorms mostly occur in the spring in the north, and sandstorms do not occur for a period of time after rainfall is good evidence.

5. In addition, the drought and lack of rain in the early stage, the warming of the weather, and the rise of temperature are the special weather and climate 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.

6. In addition, the weather situation conducive to the generation of strong winds or strong winds, favorable distribution of sand and 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 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.

Sand and dust storms are the result of the deterioration of the surface environment and 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.

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.

That's right. Failure to protect the ecological environment, destruction of forests and grasslands, and soil erosion are the main causes of sandstorms.

The beneficial effects of dust storms on the environment are as follows:Clause. 1. Atmospheric particles (aerosols), including sand and dust, can be cooled by reflecting a large amount of solar radiation that falls on the earth, thus offsetting about 20 percent of the global warming value caused by the increase in the greenhouse effect of the earth's atmosphere caused by the massive emission of greenhouse gases by industry.

Clause. 2. Although the amount of acid pollutant gases emitted by industry in the north of China is not less than that in the south, the north does not have the acid rain that is common in the south. The main reason for this is that acid rain is neutralized by alkaline dust in the atmosphere.

In the same way, South Korea and Japan, which are downstream of China's weather, most of the rain immediately changes from acidic to neutral whenever China's dust airflow moves eastward in spring.

Clause. 3. Over the past million years, the sand and dust flow from the west has accumulated an area of one million square kilometers on the Loess Plateau in China. The crops on the loess not only solved the problem of eating and clothing for the people of the farm; Moreover, tens of millions of loess caves on the plateau that are warm in winter and cool in summer have also solved the problem of living for tens of millions of peasants in Siwuzao Town, and reduced the number of frozen deaths in the cold wind in thousands of years of history.

None of this is trivial.

There are three main reasons for the wide impact of sandstorms. First of all, the main causes of the formation of sandstorms are soil wind erosion and dry weather in dry areas. These areas often lack vegetation cover, and the soil is easily exposed to the effects of wind, forming sand and dust.

Second, sandstorms tend to spread rapidly under the impetus of high winds, and the stronger the wind, the wider the scope of the nonsense. Finally, the spread of dust storms is also affected by topography and meteorological conditions. Terrain such as mountains, plains and coastlines can affect the flow of wind, allowing sandstorms to spread over long distances.

Meteorological conditions, such as stable high-pressure systems and dry weather, can also contribute to the spread of dust storms. In general, the widespread causes of dust storms include lack of vegetation cover, high winds, and the impact of topographic and meteorological conditions.

The first point is that sandstorms are produced through a kind of formation of nature, and the second point is that sandstorms mostly occur in seasons such as autumn and spring, because this season belongs to the season of recovery of all things.

It is more common in spring, mainly because sandstorms can transfer organic matter, which is of great help to the ecology.

It is because our temperature has a tropical monsoon climate, and with the influence of some water and soil, there will be sandstorms, which often occur in summer.