Is the cold wave in the north related to the haze weather?

The cold wave in the north has nothing to do with the haze weather.

cause

Cold wave is a kind of disastrous weather in winter, and people are used to calling it cold wave. The so-called cold wave refers to the cold air from high latitudes, which rapidly strengthens under certain weather conditions and invades the middle and low latitudes, causing severe cooling, strong winds and rainy and snowy weather along the way. When this cold air reaches a certain standard, it is called a cold wave.

Standard: China's meteorological department stipulates that if the temperature drop caused by cold air intrusion reaches 10 degrees Celsius in one day, and the lowest temperature is lower than 5 degrees Celsius, it is called a cold wave process.

Geographical factors:

China is located in the southeast of Eurasia. From China to the north, there are Mongolia and Siberia. Siberia is a very cold place. If you continue to go north, you will reach the northernmost part of the earth-the North Pole. It is colder than Siberia, and the cold period is longer. It is from those places that the cold wave affecting China formed.

Located in the Arctic at high latitudes, Siberia and the Mongolian Plateau, the ground rarely receives the heat of the sun all year round. Especially in winter, when the sun moves south, the angle of the sun in the northern hemisphere becomes smaller and smaller. So the ground absorbs less and less sunlight heat, and the surface temperature becomes very low. In the Arctic Ocean in winter, the temperature is often below -20℃, and the lowest can reach -60℃-70℃. 5438+ 10 The average temperature in June is often below -40℃.

In the Arctic, due to the weak sunlight, the ground and the atmosphere get less heat, and it snows all year round. In winter, the direct sunlight passes through the equator and reaches the southern hemisphere. The arctic region is colder and wider, and the temperature is generally below MINUS 40℃-50℃. Large-scale cold air masses gather to a certain extent, and under the action of suitable high-altitude circulation, they will invade southward on a large scale, forming cold wave weather.

Because the temperature in the Arctic and Siberia is very low, the density of the atmosphere will increase greatly, and the air will continue to shrink and sink, increasing the pressure. This will form a strong, deep and broad cold and high-pressure air mass. When this cold and high-pressure force increases to a certain extent, it will flood into China like a tide that has burst its banks. This is the cold wave.

Every time a cold wave breaks out, the cold air in Siberia will decrease and the air pressure will also decrease. But after a while, the cold air gathered again and piled up, gestating a new cold wave outbreak.

Source area:

Cold air source: ① the sea surface in the west of Xindi Island. (2) East of Xindi Island. Iceland is on the south China sea.

Key cold wave areas: According to the statistics of the Central Meteorological Observatory, 95% of cold air passes through central Siberia (70 ~ 90 E, 43 ~ 65 N) and accumulates there. This area is called the key area of cold wave.

Cold wave path:

There are three main paths for the cold wave to invade China:

(1) West Road: It enters Xinjiang, China from the west of Siberia and advances to the southeast via Hexi Corridor;

(2) Middle Road: After entering China from central Siberia and Mongolia, it passes through Hetao area and south-central China;

(3) East Road: it enters the northeast of China from eastern Siberia or eastern Mongolia and goes south through North China;

(4) East Road plus West Road: East Road cold air flows south from the lower reaches of Hetao, and West Road cold air flows south from the southeast of Qinghai. Two cold air often meet on the east side of the Loess Plateau, between the Yellow River and the Yangtze River, causing a wide range of rain and snow, and then the two cold air meet south, causing strong winds and obvious cooling.