How harmful is sandstorm weather?

The hazards of sandstorms are strong winds and dust. Its influence is mainly manifested in the following aspects:

1. Soil wind erosion, vegetation destruction, farmland burial.

2. Polluted air According to the monitoring network of the State Environmental Protection Administration, on the day of the strong sandstorm on March 20, the amount of dustfall per square meter in Beijing reached 20 grams, and the total suspended particles reached 20 micrograms per cubic meter 1 1 000, which was more than ten times the national standard and 1 000 times the normal value.

3. The impact of sandstorms on traffic is mainly manifested in the following aspects: First, the visibility is reduced, which affects driving and aircraft take-off and landing. For example, seven airports in South Korea were forced to close on March 22nd, and about 70 flights were forced to cancel on March 2nd1day. Second, sand and dust bury the roadbed and hinder traffic. According to China Business Daily, the train from Urumqi to Xi was blocked because the sandstorm buried part of the railway.

4. Affect the use and production of precision instruments.

5. There are many kinds of health damage caused by sandstorm, which is harmful to human health. Skin, eyes, nose and lungs are the first places to contact sandstorms and suffer the most. The damage of skin, eyes, nose, throat and other direct contact parts are mainly irritation symptoms and allergic reactions, while the lung manifestations are more serious and extensive. Seven years ago, American health scientists first suggested that there was a link between fine pollution particles and lung disease and heart disease death. Australia's "Time" said that sandstorms caused by soil wind erosion are the chief culprit of asthma in 2 million people in the country.

6. Causing weather and climate changes The impact of this sandstorm not only involves China 13 provinces, but also affects South Korea and Japan; 65438+1September 1998, a sandstorm originated in Kazakhstan, passed through a vast area in northern China, and transported a lot of dust to North America through high altitude; In April of 20001year, a strong sandstorm originated in Mongolia swept across the Pacific Ocean and the continental United States, and finally dissipated over the Atlantic Ocean. Such a large range of dust forms suspended particles in the sky, which is enough to affect the weather and climate. Because suspended particles can reflect solar radiation, thus reducing the atmospheric temperature. Because suspended particles greatly weaken the solar radiation (about 10%), the speed of the earth's water circulation may slow down and the precipitation will decrease; Suspended particles can also inhibit the formation of clouds, reduce the precipitation rate of clouds and reduce the water resources of the earth. It can be seen that dust may aggravate the drought.

Look at the following statistics, let us realize the urgency of preventing and controlling sandstorms.

China has 1500 km of railways, 30,000 km of highways and 50,000 km of irrigation canals damaged to varying degrees by sandstorms.

In recent years, the annual direct economic loss caused by sandstorms in China has reached 54 billion yuan, which is equivalent to three times the fiscal revenue of the five northwest provinces 1996.

Scientists have calculated that it will take more than 2,000 years to scrape off 18 cm thick topsoil on a grassland. For example, it takes 49 years to scrape off the same amount of topsoil on corn farmland; On bare ground, it only takes 18 years.

April and May are the high incidence periods of sandstorms in northern China. Please pay close attention to the weather forecast and prepare for sandstorm prevention in advance. (Sina is taken from: Shenyang Meteorology)