Traditional Culture Encyclopedia - Weather forecast - How is cold air formed?
How is cold air formed?
1, Origin: Arctic Ocean, cold Siberia is the birthplace of cold air. The cold air originally came from the Arctic Ocean, and later strengthened through Siberia. These areas have high latitude, long winter nights, short days and few sunshine hours. In the polar regions, there will even be extreme nights, and the sun never shows its face. Therefore, the earth's heat from the sun is very weak; However, at night, the ground radiates a lot of heat into space. With the continuous cooling of the ground, the temperature in the atmosphere near the ground is getting lower and lower, and the accumulation of cold air will increase. Guided by the northwest airflow, this cold air mass with extremely low temperature will push from north to south, affecting Mongolia, North China, East China or most parts of China.
2. Cold air is the air in low temperature zone. Defined by the horizontal difference of temperature, most of them are formed in polar regions and Siberia, with a range of thousands of kilometers and a thickness of several kilometers to dozens of kilometers. Cold air crossing the border will bring rain and snow. , will make the temperature plummet. The intensity of each cold air intrusion is different, strong or weak, and the cooling rate is also more or less. Cold air, such as tidal surge, affects a wide range, reaching more than 2000 kilometers. Because the moving path is different, the influence area is also different.
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