There are still sand or floating dust in many places in Hebei. What is the reason for this weather phenomenon?

The strongest sandstorm weather process in 10 years was reported in many places. It is predicted that the heavily polluted weather will last until about 18, and there will still be sand blowing or floating dust weather in many places in Hebei. The main reason for this weather is the influence of sandstorm in Mongolia. Sandstorm is a serious weather phenomenon. Strong winds roll it up from the ground, making the air turbid, and the horizontal visibility is less than 1000 meters ... It mostly occurs in arid and desertification areas, with less precipitation, sparse vegetation and windy weather and its vicinity.

When sandstorms appeared from abroad and entered Hebei Province, the dust concentration in the air rose sharply. It will lead to serious air particulate pollution. Sometimes the source of sandstorm is not big. The sediment concentration is not high, but it keeps moving. Due to topography, temperature, climate, vegetation and other reasons, sandstorms have intensified rapidly, causing huge environmental disasters.

Sandstorm is the result of many factors. Especially under the premise of macro-climate and potential surface conditions, the occurrence and development of extremely strong sandstorms also need favorable circulation conditions and weather systems. The occurrence of sandstorm has obvious daily, seasonal and interannual changes. During the day, sandstorms mainly occur from noon to night, and even less from night to noon. The seasonal variation is the most in spring, followed by summer and the least in autumn and winter. A lot of dust. Suspended particles form at high altitude. 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, 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.

The impact of sandstorm on traffic mainly includes: first, the reduced visibility will affect driving and aircraft take-off and landing; Second, buried sand subgrade. Traffic jam. Sand burial means that farmland, rivers, bungalows, railways and grasslands are buried by a large number of quicksand, which poses a serious threat to transportation. Because the drought trend in the northern region, especially in Hebei Province, will not be reversed in a short time. Therefore, by improving the ecological environment of the birthplace of sandstorms, we should do a good job in protecting the transit areas of sandstorms and improve human awareness of environmental protection. It plays a very important role in reducing the harm of sandstorm and protecting the ecological environment.