Why is the dust so frequent this year?

Dust, I believe that when many people hear this word, they will associate it with flying dust and covering the sky. Although this is a common natural phenomenon in China, it is very frequent and special this year.

However, this spring, many places in northern China were hit by dusty weather many times. Air quality and visibility decline, and people's lives are affected to varying degrees. According to the information on the Internet, I summarized the reasons and countermeasures of frequent sandstorms, and discussed them one by one.

1.？ Climatic factors:

Since the beginning of this year, the temperature in the dusty source areas such as Mongolia and Northwest China is high, the precipitation is low, the soil is dry, the vegetation growth is deviated, and the surface conditions are not conducive to restraining the occurrence of dusty weather. Especially in the south of Mongolia, the vegetation growth is different from the average of last year and nearly 20 years. This may also be related to global warming and extreme drought events, leading to the expansion and activity of sand sources.

At the same time, the imbalance caused by climate change and human activities also makes dusty weather more frequent. This spring, the temperature is higher and the wind is stronger than in previous years, which are the direct causes of sandstorm weather.

2.？ Cold air and Mongolian cyclone are frequent;

Since March this year, there have been eight large-scale sandstorm weather processes in China, and the sandstorm weather process since April 9 has reached the level of sandstorm.

These dusty weather processes are mainly caused by frequent cold air and strong wind brought by Mongolian cyclone. Cold air and Mongolian cyclone can drag the dust in the dust source area into the air and transport it southward with the airflow, affecting many provinces in northern China. In addition, this may also be related to the warm weather in spring and the fierce confrontation between cold and warm air, which leads to windy weather in the north.

3.？ Low-level atmospheric instability;

The formation of dust weather also needs the instability of the lower atmosphere, which is conducive to the development of strong convection and lifts more dust to a higher position.

The instability of the lower atmosphere may be related to the high temperature and dry surface conditions in the early stage of the dust source area. This is also related to global warming and extreme drought events, which lead to the loosening of the surface after thawing and make the floating dust more vulnerable to strong winds.

4.？ Human activities:

The development of human beings also has a great influence on the formation of sandstorms. In recent years, China is in a state of high development. Some industrial pollutants and exhaust gas emitted by motor vehicles will lead to the decline of air quality, reduce atmospheric stability and aggravate the formation of sandstorms.

In addition, in terms of land degradation, with the acceleration of urbanization, the problem of desertification in many areas has become more and more serious. Land degradation will not only lead to the destruction of the local ecological environment, but also expose the local sand to the wind and increase the possibility of sandstorm formation!

Under the influence of the interaction of these factors, dusty weather is more frequent this year than in previous years. But in fact, this phenomenon is also reflecting the impact of global change on the natural environment and human society, so we should strengthen ecological protection and disaster prevention and mitigation, and improve our ability to deal with sandstorm weather. Combined with domestic development, I also summarized several management preventive measures, as follows:

Ecological construction and protection of dust source areas should be strengthened. After all, the dust source area is the root of dust weather. To control the generation and diffusion of dust from the source, we must strengthen the ecological construction and protection of dust source areas. We will implement major ecological projects such as the Beijing-Tianjin sandstorm source control project and the rocky desertification comprehensive control project, create forest and grass vegetation, and improve the vegetation coverage rate and sand fixation capacity in the dust source area.

Plan and implement afforestation. Afforestation is an important means to prevent desertification. According to the natural conditions and social needs of different regions, we should scientifically formulate afforestation plans and programs, rationally select tree species and models, and improve the quality and efficiency of afforestation.

Strengthen the monitoring, early warning and emergency response of sand and dust weather. It is necessary to grasp its occurrence and development in time, make early warning and emergency preparations in advance, and reduce its impact on people's lives and production. Scientifically carry out sand and dust weather monitoring, forecasting and early warning release, and timely release relevant information to the society.

In short, there are many reasons for frequent sandstorms this year, but there are also many factors that can be avoided. The troubles and challenges brought by this phenomenon also remind us that human activities also play an important role in global climate change. Let's act together and contribute to winning the hard battle of combating desertification!