Causes and prevention of sandstorm

First of all, there are three basic conditions for the formation of sandstorm weather: first, there must be sand source, second, there must be strong cold air, that is, strong wind, and third, there must be interaction between cold and warm air. The sand source comes from desert, degraded forest and grassland or dry loose land without vegetation cover, as well as sediment from urban and rural construction sites. Cyclones and low pressure produce vertical upward movement, blowing up dust and forming sandstorm weather. Meteorologically, the differences among sand blowing, floating dust and sandstorm weather are distinguished by visibility: the weather with horizontal visibility between 1 ~ 10 km is sand blowing or floating dust. When there is floating dust weather, the air is filled with some fine particles, and most of the dust comes from other places; The dust rolled up in the sand-blowing weather is some large particles, which are basically produced locally. Sandstorm weather with horizontal visibility less than 1 km is a disastrous weather phenomenon, which brings the most serious harm. Meteorologists said that it is impossible to eradicate sandstorms at present because the causes of sandstorms include wind, strong convection in the upper atmosphere and surface conditions, while the first two are climatic factors and irresistible to human beings.

The most active and effective behavior of human beings towards sandstorm weather is:

First of all, we should strengthen the monitoring and forecasting of windy weather, especially in the early drought.

Pay attention.

Secondly, before the sudden disaster comes, we should have quite effective emergency countermeasures, strengthen management and strengthen preventive measures.

The most fundamental thing is to carry out comprehensive management work. The whole society * * * peers move to combat desertification.

Desert, improve the ecological environment. While doing a good job in economic construction, we should pay attention to ecological construction. each

Every citizen should have a strong sense of hardship and environmental protection, and should strengthen teaching in this area.

Education, so that we can really do a good job in afforestation, expand vegetation coverage, increase revenue and reduce expenditure, and use water rationally.

Resources. Shaanxi, in particular, is the bridgehead of the western development, and it is necessary to implement the policy of "returning farmland to forests"

Forest (grass), closing hillsides to facilitate afforestation, individual contracting, and taking food as relief as the main measures for early implementation.

Now, the rice grains go down to Sichuan, the fruit trees go up the mountain, and the grassland is full of slopes, making the land of Sanqin green, clear and rich. chase

Gradually restore the rich and diverse natural ecosystems. In this way, maybe in a few decades, the sandstorm will be lighter.

Turn it into our memory, and our descendants will see a beautiful northwest.