Extreme weather in Mongolia has caused 10 deaths. What are the causes of extreme weather?

The sandstorm on March 15 affected most parts of northern China, resulting in the phenomenon of yellow sand all over the sky and no sun all day. In recent years, more than a dozen sand control projects in China have been effective, and sandstorms have not been seen for many years. However, since this sandstorm originated in Mongolia, it is beyond our control. By the time the sandstorm swept through our country, it had halved and had no effect on normal life. But for some people who are sensitive to dust, they still feel obviously uncomfortable. In addition, extreme weather terms such as warm winter, La Nina and El Ni? o are gradually becoming familiar to people. How are these extreme weather formed?

1. Sandstorm, sand and wind? Art? There are two conditions for the formation of sandstorms. One is the wind. For example, this sandstorm is mainly the strong wind brought by the strong cold current from Siberia, which rolls up the dust on the surface. The second condition is sand source. Due to overgrazing in Mongolia, Mongolian grassland has been degraded in a large area, and the local vegetation has not been restored. The dust on the surface could not be locked, and a large amount of dust was swept away by the strong wind, which directly led to this sandstorm. China can effectively control sand because China pays more attention to controlling sand sources. Compared with changing the unstable airflow, it is easier to control the surface sand source, especially the vegetation restoration of the Three-North Shelterbelt, Mu Us Desert and Saihanba in China directly led to the reduction of sand source in northern China. Effectively protect soil erosion.

Second, global warming, the greenhouse effect has become the culprit. The climate becomes unstable, and a lot of extreme weather is more unstable because of atmospheric circulation. An important reason why atmospheric circulation is becoming more and more unstable is climate warming. The higher the temperature, the stronger the convection. Global warming directly leads to the instability of atmospheric circulation. At the same time, due to the influence of seawater temperature, the intensity of ocean currents will also be affected, which is also the reason why La Nina and El Ni? o appear. At the same time, due to rising temperatures, glaciers melt and sea levels rise. The change of land-sea ratio also directly affects the land climate.

Third, over-exploitation of human beings Due to the sustainable development of human beings, the demand for resources is increasing, and over-exploitation leads to underground cavities. Deforestation leads to dry climate, which also directly leads to soil erosion. It can be said that many extreme weather are the result of human development.

Protecting the environment does not mean sacrificing human development, but should follow the development model of sustainable development. While using natural resources, we also respect nature and protect the natural environment. We are all children of the earth, and protecting the environment requires global cooperation.