The cold wave blue warning appeared again. Why is it so cold in China this year?

Even my grandfather said that the winter of 2020 can really be regarded as the coldest winter he has experienced since 2000. Seeing a netizen's self-feeling about the degree of cold this winter, he said? The winter of 2020 is the coldest winter since 2006. ? I think the older some elderly people get, the more entitled and qualified they are to answer this question. After all, they have experienced many years, and it is coldest every winter, so their feelings are really the most real after decades.

It should be emphasized every year, right Global warming? Severity, then why there will be so many waves of climax in the winter of 2020, which will definitely raise the cold degree in the winter of 2020 to a new historical height since 2 1 century. Some people call this phenomenon weird, but behind it is actually a geographical and meteorological problem that can be solved with scientific knowledge.

( 1) 2020? 202 1 year, why do cold waves come so frequently? The New Year's cold wave in 2020 just left, followed by the 202 1 cold wave, which hit most parts of China without bias. According to the weather news, the fourth national cold wave is coming. On the morning of 202 1, 1, the Central Meteorological Observatory issued a blue warning of cold wave. In Xinjiang, Shanxi and Northeast China, the temperature drops 10 ~ 12℃, and the local temperature can reach above 12℃. So, why have cold waves come so frequently recently?

According to the explanation of meteorologists, La Nina event is still going on, which leads to the increase of the meridional dimension of atmospheric circulation, thus guiding cold air to the south frequently. From this expert? La Nina phenomenon? What is this? What does it have to do with frequent orgasms? La Nina phenomenon is an abnormal cooling of seawater in the central and eastern Pacific Ocean. Under the influence of the southeast wind, the sea water temperature in the west rises, humid air accumulates to form typhoons and tropical storms, and the bottom sea water in the east turns up, which makes the sea water in the East Pacific cool.

This year, the Arctic sea ice decreased, and the temperature was higher than the same period, which led to the cold air mass in the Arctic leaning towards the Asian region, making the cold air intensity affecting China stronger. The cold wave usually lasts for 3 to 7 days, and the longest lasts for 7 to 10 days. In winter in China, cold waves usually occur once every 3-8 days, but relatively strong cold waves average about 4 times a year. From the end of 10 to the end of the following year 10, cold waves also occurred in late February in some years.

(2) What is the close relationship between severe cold in winter and global warming? This is really difficult for me who is not proficient in geography. In my mind, I always think that since global warming, shouldn't it be global temperature rise? Moreover, it is a phenomenon of global temperature rising all the year round, which can be called global warming. But what I don't know is that global warming will affect the arrival and intensity of high tide. Accurately speaking, these cold waves at the junction of 2020 and 20021are all related to global warming.

Song Lianchun (director of China Meteorological Society) made an authoritative response to this: Under the general trend of global warming, one south and one north? Two signals were attacked in both directions. ? In other words, the frequent cold air strikes at the intersection of these two years are inextricably linked with global warming. Because global warming will change the global atmospheric circulation situation and affect the local climate through the interaction between ocean and atmosphere, land and atmosphere.

As far as China is concerned, most of the cold air over China comes from the Arctic. The phenomenon that it was not too cold in the past winter was because the polar vortex over the North Pole would completely lock the cold air in the North Pole and not extend outward. However, due to the influence of global warming, the Arctic and Antarctic are the two most sensitive regions to global warming. Under the influence of global warming, the melting of Arctic sea ice will accelerate, which will lead to the weakening of polar vortex, which will cause the cold air that has been fixed over the Arctic to move southward, and the cold air will inevitably pass through China along the way.

(3) It is normal for the climax to come. In the final analysis, the measures to prevent it are caused by global warming and a series of behaviors that are not suitable for nature in the development of human society. So, still? People are sick in people? Some sensitive changes in nature, a series of human beings in society? Excessive? Action is inseparable from relationships. Global warming has become a trend, and how to curb global warming is a problem that all mankind should face together, which needs to be solved urgently!

The cold wave has a great influence on human beings, so there is no need to mention some common protective measures here. But one thing, cold weather is a severe test for cardiovascular patients, because cold can easily lead to vasoconstriction and even spasm:

Patients with coronary heart disease are prone to angina pectoris;

Patients with heart failure are easily aggravated by respiratory tract infection;

Diabetic patients often have peripheral nerve and peripheral vascular diseases;

The above-mentioned sick people should strictly control the arrival of climatic weather. After all, the cold will make these sick people insensitive to the stimulation of external cold and heat and pain. So on this basis, we should pay special attention to prevent frostbite and scald.