It is generally cold in winter this year. What's the reason for this weather?

I firmly believe that you all realize that 202 1 seems to be particularly cold. Although authoritative experts have gone out to rumor that it is "the coldest in 60 years", the overall temperature may be colder than before. So far, China has experienced several rounds of cold current siege, resulting in a large-scale high temperature of the destroyer Xuefeng. So, what is the reason why the weather is particularly cold this year? Do you know what caused the particularly cold weather this year? Let's master it together

1. La Nina phenomenon: When La Nina phenomenon occurs, the electric field in the middle and high latitudes of Asia and Europe is very large, and the theme activity of strong cold air is also slightly stronger. The temperature in most parts of central and northern China is very easy to be slightly lower.

2. Too little arctic sea ice: Too little arctic sea ice is beneficial to the strong ridge of Ural Mountain in winter and the strong wind in East Asia in winter, and the temperature in most parts of central and northern China is slightly lower than in the long term.

Related information: As early as the beginning of May 2020, climate biologists have been able to roughly think of the cold winter. At that time, biologists observed the El Ni? o phenomenon that lasted for more than five months-the last winter was a "warm winter", which was very harmful to a large extent. Moreover, in the summer of 2020, climate events (including a series of climate disasters) in Asia, Europe and America are more or less related to it.

After El Nino, La Nina often appears. At the beginning of 2020 10, the Japan Meteorological Administration released information, and they observed that La Nina phenomenon had occurred, and the probability would be around all winters in the northern hemisphere.

La Nina means "little girl" in Spanish, also known as the anti-El Ni? o phenomenon, which refers to the phenomenon that the sea surface in the eastern and central equatorial Pacific keeps getting cold, mainly because the sea surface temperature is low, the average climate is above 0.5, and the delay time is above 6 months. The omen of La Nina phenomenon is storm, rainstorm and cold, and it and El Ni? o phenomenon will make global climate change more serious and abnormal.

Generally speaking, the harm of La Nina phenomenon includes making the east coast of the southern United States and South America drier and drier, causing abnormal rainfall in Southeast Asia such as Australia, Indonesia, Malaysia and the Philippines, and extreme cold in Northeast Asia such as the east and southeast coasts of Africa, Japan and the Korean Peninsula.