The weather is getting warmer and warmer.

The recent cold wave is influenced by two factors: one south and one north. The first is the arctic sea ice factor. The polar vortex over the Arctic is the hometown of cold air and should be locked up. However, due to global warming, the arctic sea ice area in September 2020 was the second lowest in history, which weakened the polar vortex and made it difficult to "lock" the cold air. Since winter, the center of cold air mass has moved to Eurasia and moved south. The meridional circulation of "high in the west and low in the east" appeared in the middle and high latitudes of Eurasia, which led to a strong winter wind over East Asia. The second is the equatorial La Nina factor.

La Nina refers to the abnormal cooling of seawater in the central and eastern Pacific Ocean. Since August 2020, the SST in the equatorial Middle East Pacific Ocean has entered the La Nina state. The cooling of seawater has also led to the further strengthening of the winter monsoon in East Asia, and the cold air activities are more frequent than normal. Cold wave and climate warming seem to be opposites, but they are not contradictory. Global warming does not directly correspond to such simple pairing problems as "warm winter", "cold winter" or "whether a process is cold". Global warming means that the global annual average temperature is generally high. Affected by climate events, there will still be fluctuations in temperature and warmth in individual years.

Due to the low solar altitude angle in the Arctic, the amount of sunshine in winter is reduced, so a cold air mass is formed on the surface of the Arctic Ocean. The cold air affecting China mainly comes from the east and west surfaces of New Zemlia Island in the Arctic and the ocean south of Iceland. These air masses moved southward under certain conditions, resulting in severe cooling weather in China. In recent years, global warming has led to an increase in the frequency and intensity of extreme weather events such as cold snap. The energy of the global atmosphere is conserved. As climate warming continues to lead to abnormal high temperature in one area, the temperature in the surrounding areas will drop, leading to extreme weather such as heat wave, drought, flood, typhoon and cold current.

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