Heilongjiang-49 degrees ushered in the lowest temperature in 50 years. What do you think of the unusually low temperature this year?

Since the winter of 2020, there have been various news on the Internet that 2020 will be a cold winter, and many places will break the previous film and television records. Indeed, in Jinan, Shandong Province, where I live, in June of 5438+ 10, the temperature has reached MINUS 20 degrees Celsius for several days, and many residential water pipes have frozen. This shows that this winter is indeed much lower than before. In February 1, it was reported on the internet that Heilongjiang continuously set a new low temperature record due to the influence of strong cold air, and it was on June 65438+1October 7? China Arctic? The temperature monitoring station in amuer Town, Mohe City, Daxinganling, Heilongjiang Province has detected the lowest temperature-minus 49.7℃. This temperature can be said to be the coldest day in Heilongjiang in recent 50 years. So what is the cause of this extremely cold temperature? Mainly related to the following three points.

The first reason: the Arctic vortex is weak, and friends who have a certain knowledge of geography or often watch the weather forecast must have heard the saying that China will be attacked by cold air due to the strong cold air from Mongolia and Siberia. How many degrees will the temperature drop in a certain area? Yes, in winter, the main reason of cold air attack in China is the cold air in Mongolia and Siberia. But in fact, the cold air in Mongolia and Siberia mainly comes from the Arctic, and the cold air in the Arctic keeps gathering, and then it will continue to be oppressed to some extent. When the Mongolian Siberian Plateau can't bear it, it will bring strong cold air to the south of China. In the winter of 2020, due to the weak ground vortex in the extremely cold weather in the north, cold air directly went south, which led to extremely cold weather in a large area of China.

The second reason: the equatorial eastern Pacific is in La Nina state, which is contrary to El Nino, so La Nina can also be called anti-El Nino, or what? Cold event? . It mainly refers to the abnormal phenomenon of the abnormal drop of water temperature in the eastern Pacific near the equator, which is mainly the product of the interaction between tropical ocean and atmosphere. The reason for this phenomenon is not very clear, and it is now agreed that it is caused by the chaos of global climate. According to observation and research, this phenomenon shows that the surface temperature of seawater will be lower than 0.5℃ under normal conditions, and the duration may be more than 6 months.

The third reason: the radial degree of circulation in middle and high latitudes in Europe and Asia is enhanced, which leads to the accelerated southward influence of polar cold air, resulting in a large-scale cooling. Under normal circumstances, the circulation in the middle and high latitudes will, in a sense, block the southward movement of cold air. Because the meridional enhancement of the circulation in the middle and high latitudes creates favorable conditions for cold air to go south to a certain extent, which is also one of the main reasons for the large-scale cooling in China!