Cold wave refers to a large-scale strong cold air activity in winter half a year. How is it formed?

Cold wave is a natural weather phenomenon, which mainly refers to the process of cold air invading low-pressure areas on a large scale like tides in winter and half a year. It has a great influence on human life. It is accompanied by rain, snow and strong winds, and the temperature drops suddenly, which is harmful to some extent. The cold wave in China mainly comes from the cold high pressure in the south of the Arctic and Mongolia, which is caused by the lack of sunshine all the year round in the snow-covered areas, and the air becomes colder and drier under the influence of temperature, and finally reaches a certain pressure level and exhausts to the low-pressure areas.

First, the cause of the cold wave Cold wave is also called cold current, which is the phenomenon that cold air moves from high latitude to low latitude. According to the regulations of China's meteorological department, the temperature drops more than 10 degrees Celsius in one day, and the lowest temperature is below 5 degrees Celsius, which is a cold wave in the process of cold air outbreak. China is located in the southeast of Eurasia, with Russian Siberia and Mongolia in the north and the Arctic in the north. Most of the cold waves in China are formed in the Arctic region, where there is less sunlight radiation and less sunlight heat, especially in winter, when the surface temperature is low and ice and snow are the norm. The degree of winter intensifies, the low temperature range becomes larger, and cold air masses gather. Affected by the atmospheric circulation in the upper air, it invaded southward on a large scale, forming a large-scale cold wave.

Second, the main harm of the cold wave The cold wave is a disastrous weather in the winter half year, which forms a strong wind and poses a certain threat to coastal areas. Rain, snow and strong winds have a certain impact on transportation and agriculture, causing great harm. In the face of cold wave hazards, people can take some effective preventive measures to prevent losses, such as cultivating cold-resistant varieties in agriculture and enhancing cold-resistant ability. In case of adverse weather conditions such as strong winds, passengers should be stopped in time to avoid traffic accidents. We should take measures to keep warm when the weather suddenly gets cold.

The cold wave has a series of characteristics, and it is an invasion of cold air. In the Loess Plateau, there is less snow and wind, which is easy to cause sandstorms. North China is often accompanied by snow; There are heavy snowstorms in the northeast, with a large amount of snowfall; The temperature in Inner Mongolia is obviously low.