CCTV News:As the "crown jewel" of modern industry, aero-engine has always been a "heart disease" of China aviation industry. With the establishment of China’s 12th military enterprise in Beijing, Chinese people have high hopes for this aero-engine enterprise, hoping that it can achieve the same achievements as "two bombs and one satellite".

　　Yesterday, the four-day air force aviation opening activity came to an end, and more than 20 military aircraft in the 34-type domestic weapons and equipment attracted national attention.

△ On September 2, 2016, the 2016 Changchun Aviation Open Day was held in the rain, in which a variety of air force active equipment such as H-6K, JL10, JL9 and Air Police 500 were unveiled.

　　At the same time, it also brings people cold thinking: what is the current localization ratio of the big country air force, which has a huge demand for aero-engine industry, and what level has it reached? How far are we from the aero-engine power?

　　Guogui Wu Decryption: Localization has gone through the process of introduction, imitation, improvement and innovation.

　　Guogui Wu, a 57-year-old special pilot of the Air Force, holds the rank of senior colonel. He used to be the captain of the Air Force Bayi Air Show Team and the deputy division commander of an Air Force Aviation Division, with 30 years of flying experience. As an old pilot with actual combat experience, and now a professor in the post-installation teaching and research department of National Defense University, he has unique insights in studying military high-tech, air force weapons and equipment, and equipment safety management.

　　At present, what kind of level is the localization ratio and performance of aero-engines in China? Guogui Wu said in an interview that China has established an independent aero-engine industrial system in the process of industrialization, and the performance of imitation engines reached a very high level in the 1960s and 1970s.Among the main combat aircraft, domestic engines have accounted for about 90%.

　　The so-called localization here refers to the process of introduction, imitation, improvement and innovation.Due to China’s weak industrial base, in order to meet the strong military demand for aero-engines, the Soviet Union’s aid and imported production methods were adopted. On the basis of the introduction and digestion of Soviet engine production technology, the model was improved, and the scale and serialization of domestic production were gradually realized, which basically met the needs of China’s air, land and sea aviation forces.

　　In the 1960s and 1970s, the overall performance of aero-engines produced in China was not much different from the mainstream level in the world at that time. The fundamental difference was that the domestic engines were mainly imitations and modifications, and there was no engine that was completely independently developed and produced.

　　"Not only do we have no independent intellectual property rights, but we also have no core technology." Guogui Wu said, therefore, in the 1980s and 1990s, when the aviation technology of the United States, Europe and Russia developed rapidly, and the third generation fighters were generally equipped with a new generation of turbofan engines, China was still "playing around" in the improvement of turbojet engines, hesitating on the road of introducing imitation and independent innovation, and the gap between China and the world’s advanced level was not large. Not only does the new generation of fighters lack the drive of advanced engines, but the engines in service also have some quality and safety hazards, which are called "heart disease" by Chinese people.

　　Only a few third-generation aircraft of the main fighter are equipped with imported engines.

　　△FWS10 aero-engine is an advanced aero-turbofan engine designed and manufactured by China. It is installed on the domestic J -11 aircraft and can also be installed on the J -10 aircraft after modification. Now it has been mass-produced. It has become an ideal device for the third generation fighter in China.

　　After 60 years of development, China has fighter planes, bombers, attack planes, transport planes and trainers.Systematize the aircraft production capacity of many types of aircraft. In line with this, a relatively complete engine development and production system has been established, which has the series development and production capacity of turboprop, turbojet, turbofan and turboshaft engines. Domestic engines are mainly assembled on fighter planes, fighter planes, bombers, fighter bombers and other main battle planes, and only a few third-generation fighters are equipped with imported engines.

　　For example, domestic fighters such as J -5, J -6, J -7 and J -8 are adapted to corresponding domestic engines such as turbojet -5, turbojet -6 and turbojet -7. With the improvement of stability, safety and reliability of Taihang engine, it has been widely installed on three generations of fighters, such as J -11, J -15 and J -16.

　　In terms of bombers, H -5 and H -6 realized the localization of engines. The turboprop engines used in Yun -7 and Yun -8 transport planes are all made in China.

　　With the maturity of integral technologies such as Zhi -9, Zhi -8 and Zhi -10, the serial development of turboshaft -8, turboshaft -6 and turboshaft -16 engines has been realized on the basis of introduction, which provides a reliable power source for the rapidly expanding domestic helicopter fleet in China.

　　At present, China’s aviation industry is in a stage from big to strong, from following up to catching up to developing on a par or even surpassing corners. Whether it is a new generation of military aircraft such as fighters, bombers, transport planes and drones, or large passenger planes and all kinds of general-purpose aircraft, there is an urgent need for strong and reliable driving of advanced engines. The sound and rapid development of aero-engines has become the proper meaning of the "Chinese Dream".

　　Guogui Wu said frankly that the country has clearly regarded the engine as a major scientific and technological project in the medium and long-term scientific and technological development plan, and has made up its mind to concentrate manpower, material resources and financial resources to independently research and develop a series of new engines. Domestic aero-engines have entered an unprecedented fast lane of development. In this context, the establishment of China Aviation Engine Group can be said to have a long way to go.

　　Development history of aero-engines in China

　　Stage 1: imitation and improvement

　　In 1950s, China aero-engine industry started from scratch and went through a road full of thorns. In 1956, China’s first turbojet -5 engine was successfully copied in Shenyang, and for a long time thereafter, China aero-engines were mainly copied and improved.

　　Even if it is copied, it is not easy. Even if there is no operation manual, it is difficult to disassemble the aero-engine correctly. For example, there are many small holes on the leaves of several square meters and centimeters, and the location of the small holes is very particular, which is determined according to the recorded trend.

　　Until 2002, when the domestic turbojet -14 "Kunlun" engine was finalized, China completed the whole process of self-development for the first time, and became the fifth aero-engine producer after the United States, Russia, Britain and France.

　　Stage 2: successful localization by purchasing patents.

　　The engine used in the flying leopard fighter is made in China and is called "Qinling", which is alsoIt is the first engine product in China that has been patented and successfully localized.

　　From introduction to localization, it has experienced 30 years of industrial upgrading. In 1972, China contacted Britain to discuss the introduction of the civil turbofan engine from rolls royce. In 1974, during the negotiation, to our surprise, China directly obtained the patent of Spey military engine, which was a top product at that time.

　　However, despite the patent, China’s new industrial materials and other technologies were too backward at that time. It was not until 2013 that this road of localization was completed, and it was equipped on the J-H -7 Flying Leopard fighter, and Flying Leopard became the only main fighter in China that completely got rid of its dependence on imported engines.

　　Stage 3: Own independent intellectual property rights.

　　In December 2005, turbofan -10, also known as "Taihang" engine, was successfully developed and became my engine.China’s first high-performance turbofan engine with independent intellectual property rights.

　　The road to research and development of Taihang engine is also quite difficult. During the test flight, more than 200 technical problems and failures occurred successively. After hard work, the "Taihang" engine was finally equipped on the J -15 fighter and successfully made its first flight in 2012. On a group of J -20 equipment exposed at the beginning of this year, some military fans found that a J -20 was also equipped with an improved Taihang engine. Some military experts said that the "Taihang" engine can be directly equipped on the fourth generation fighter, which laid a good foundation for continuing to develop more advanced, mature and reliable engines in the future.

The signboard on the glass fence of the zoo shows that the owner of the area is a Siberian tiger cub and an African lion cub, but through the glass, tourists can see not only a little tiger cub lying on the ground and resting, but also a little yellow dog pacing back and forth. Some children ask inexplicably, "Is this an African lion?" Is this the same? "

Recently, some netizens took relevant videos in a wildlife park in Lanling County, Linyi City, Shandong Province, which triggered a heated discussion among netizens. On February 29th, the zoo staff responded that the area was originally fed with Siberian tigers, African lions and yellow dogs. They were friends who grew up together. The cubs were moved to another cage because of their different habits. At present, only the cubs and yellow dogs are left.

Northeast Tiger and Little Yellow Dog together (video screenshot)

Recently, a number of netizens who visited Baoshan Wild Animal Park in Lanling County reported that they found a Siberian tiger and a little yellow dog living together in the zoo and getting along harmoniously. The video they shot showed that two animal information boards were posted on a glass fence. One of them belongs to the Northeast Tiger Andy, who was born on June 4, 2023 and is a little female tiger. The other one belongs to the African lion Harry, who was born on June 18th, 2023 and is also a female. However, besides Andy, the Northeast Tiger, there is also a little yellow dog. A child pointed to the little yellow dog and asked, "Is this an African lion? Is this the same? " There is also a person next to him: "Isn’t this a dog?"

In this regard, some netizens ridiculed that the African lion went home for the New Year, and the little yellow dog came to the post temporarily. Another tourist told reporters that he had been to this zoo last year. At that time, besides African lions, there were also Siberian tigers and yellow dogs, and they were photographed in the same frame.

On February 29th, the reporter contacted the Baoshan wildlife park. The staff said that the cubs of the Northeast Tiger, the cubs of the African lion and the little yellow dog were good friends who grew up together. Later, because of the different habits of lions, they moved to another cage. The Siberian tiger has not grown up yet, and will live with the little yellow dog for the time being. It is also a very fun phenomenon for tigers and dogs to live together. When the Siberian tiger grows up, it will be separated from the yellow dog.

Original title: "The zoo responds to" friends of tigers and dogs "in the same room: friends who grew up together will be separated in the future"

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() According to the data center, () on February 23rd, it was financed to buy 111 million yuan, accounting for 22.34% of the purchase amount on that day. The current financing balance is 1.244 billion yuan, accounting for 4.89% of the circulating market value, which is lower than the historical 30% split level.

Financing trend table

In terms of securities lending, China Software repaid 57,500 shares by securities lending on February 23, and sold 37,300 shares by securities lending. According to the closing price of the day, the selling amount was 1,136,500 yuan, accounting for 0.22% of the outflow amount of the day; The balance of securities lending was 24.216 million, exceeding the historical 60% level.

Securities lending trend table

To sum up, the current balance of China Software’s financing is 1.268 billion yuan, up 2.19% from yesterday, and the balance is lower than the historical 30% split level.

Trend table of the balance between the two financial institutions

Note 1: If the financing balance increases for a long time, it means that the investor’s mentality is biased towards the buyer, and the market is a strong market with strong popularity, otherwise it is a weak market.

Note 2: Buying amount = actively buying extra large single amount+actively buying large single amount+actively buying small single amount.

On February 4th, beginning of spring, the earth was blooming in spring, and everything was new in the world. CCTV’s "Network Broadcast+"specially combs the old sayings quoted by the general secretary, and enjoys poetry and spring with you to realize the power of spring.

[Source]Tang Li Bai’s "Sunset Remembering the Mountains"

[Enlightenment]Spring is the beginning of the year, and spring is known to the world. The general secretary quoted this sentence to show people a wonderful picture of spring returning to the earth, everything reviving and the future being expected.

[Source]Tang Wangwei’s The Mountain and Pei Xiucai’s Dishu

[Enlightenment]Spring is a season full of confidence. The general secretary quoted this sentence to express people’s yearning and expectation for the Spring Festival.

[Source]Song Shi Le Zhi Qi

[Enlightenment]The spring breeze is getting warmer and warmer, and everything comes with life, marking a new starting point for hopes and dreams. The general secretary quoted this sentence and called on people to fight for their dreams and work together for the future.

[Source]Jin Chen Shou’s Biography of the Three Kingdoms Wei Zhi Xing Qing; Song Ouyang Xiu’s Fengle Pavilion

[Enlightenment]People are diligent and spring comes early, and forging ahead is just the time. The general secretary quoted this sentence and called on people to start from spring, advance their work at a steady pace, and exchange their unremitting efforts for fruitful autumn harvest.

[Source]Tang Li Bai’s Shang Li Yong

[Enlightenment]The journey is long, only struggle. The general secretary quoted this sentence to mobilize and inspire the whole party and the people of all nationalities in the new journey to continue to work hard for the great rejuvenation of the Chinese nation, forge ahead courageously and create greater glories.

[Source]From the Warring States Period to the Qin Dynasty, Yanzi Chunqiu, Inner Chapter and Miscellaneous Xia

[Enlightenment]Every undertaking, big or small, needs to be done down-to-earth and bit by bit. The general secretary quoted this sentence and called on people to work hard and work hard for a long time with a never-ending mental state and an indomitable attitude.

(Central Radio and Television General Station CCTV Network)

2024 is a popular new product, and New Day Moses 3.0 sets off a new trend of retro technology aesthetics. Can you imagine that the beauty of the design of an electric car can combine "retro aesthetics" with "future technology" and combine "technology precipitation" with "future technology" to the extreme?

Based on the hot market background of Moses series, combined with the real feedback from merchants and users, New Day Moses 3.0 is further upgraded and developed with the concept of retro futurism. With more elegant retro style and modern advanced technology, it has recently created a high-value female car, which is fashionable, elegant and beautiful.

The interweaving of future and past, fashion and retro.

The design of New Day Moses 3.0 is inspired by the retro design of the Beatles, and the high windshield front panel is fashionable and practical, highlighting the strong retro style. The exterior color matching of the vehicle adopts 18th century French classics.【rococoartwindLattice]Camellia White/Luoden Frost Green, Roman Green, Rabbit Ear Powder/Plum Powder, Lime White/Oak Brown, etc. are fashionable and retro, which are the romantic aesthetics favored by artists and the most comfortable 6:3:1 gold color scheme recognized in the world, making people full of exquisite, elegant, gorgeous and delicate visual enjoyment.

Not only is the appearance of the color scheme elegant and profound, but the details of the design are also adopted by Niigata Moses 3.0."High-gloss mirror paint", 4 times spraying, 5 times baking, paint luminosity ≥ 90, more shiny and textured. Paired with those commonly used for jewelry decoration."Bright silver plating accessories"With 15 technological processes, 100+ polishing and 10h+ electroplating, it has better oxidation stability, can effectively prevent oxidation and corrosion, and is more beautiful and upscale.

From the past to the future, alwaysStick to the performance experience

Under the extreme style and high-value appearance, it is a high-profile configuration with full experience. In terms of power, Moses 3.0 is equipped.【High performance motor】, the power output is stronger; Double hydraulic shock absorption before and after, minimizing the bumpy feeling caused by rough and bumpy roads, and creating electric motorcycle-level comfortable riding. The night riding experience of the vehicle is also very comfortable, with retro rounded headlights and front and rear turn signals, all-round.【360 laser lighting system】, with stronger brightness, wider visual range and longer illumination distance.

Vehicle seats are made of high-quality delicate leather 3D wrapping design.【Palm leather cushion】After 36 tanning processes, it is more water-resistant and wear-resistant, with good elasticity, comfortable and delicate feel, and it is not easy to produce scars or deformation. Combined with the cloud cushion technology, the high-density rebound sponge with a thickness of 70mm gold is soft and fits the hip curve. The vehicle also supports【Bluetooth inductive unlocking】、【One-button reversing】And other intelligent functions, girls with small strength can also start and stop easily, comfortable and elegant throughout.

For many users, fashion sense can be said to be the first important factor affecting car purchase decision. An electric car with a good appearance can be more enjoyable and meet various needs such as wearing. On the other hand, New Day Moses 3.0 not only has a good face value, but also every detail, including style design and riding performance, gives people an exquisite and practical experience, allowing functionalism and emotional value to coexist. Let’s get off to a good start in the Spring Festival of the Year of the Dragon and turn comfortable and elegant travel into a daily routine ~

　　"Extreme cold waves are more likely to break out."

　　After the "cliff-like" seasonal cooling during the National Day, a new round of cold air followed after the holiday, bringing strong winds, cooling and rain and snow to the central and eastern regions of China. According to the Central Meteorological Observatory, on the 10th, the impact of cold air was coming to an end. However, there were still moderate to heavy rains and local heavy rains in eastern Jilin and eastern Heilongjiang. There are sleet or small to medium snow in the northeastern part of Liaoning, the eastern mountainous area of Jilin and the southeastern mountainous area of Heilongjiang, and there are heavy snowstorms in the eastern mountainous area of Jilin.

　　Despite psychological preparation, the temperature drop in early October exceeded expectations, and some areas experienced record-breaking heat and cold overnight in winter. From blowing air conditioners to wearing long trousers, people can’t help wondering: Why did the cold wave come so early this year?

　　The temperature in many places in the south is "big diving"

　　On October 2, the Central Meteorological Observatory issued a blue warning of cold wave, which is the earliest cold wave warning issued in the second half of the year since the Central Meteorological Observatory officially launched the early warning release mechanism in 2010. From 14: 00 on October 2 to 20: 00 on October 6, the temperature in most parts of central and eastern China generally dropped by 8 ~ 12℃, and the temperature in central and eastern Inner Mongolia, Northeast China, most of Shaanxi, Huanghuai, Jiang and other places dropped by 12 ~ 16℃, and the local temperature dropped by more than 18℃.

　　When the cold wave in the north hit and the temperature dropped sharply, most areas in the south were still as hot as midsummer, and they were in the yellow warning of high temperature, with the local temperature reaching above 40℃. 470 national meteorological stations such as Hefei, Nanchang, Changsha and Hangzhou also broke the record of the highest temperature in October. It is understood that this is also the first time in history that two early warnings of high temperature and cold wave have been released at the same time.

　　When the cold air drives straight, the temperature in many places in the south "dives", and the temperature in some areas such as Anhui, Hubei and Jiangsu even drops by more than 20℃. First, it experienced the hottest in the same period in history, and then it experienced a "seasonal" cooling. Many netizens in the south said that it seemed to be a day from summer to winter.

　　After the National Day holiday, a new cold air continued to hit, which was accompanied by rain, snowfall and windy weather. From 8th to 10th, a new round of strong cold air will affect the central and eastern regions of China, and the lowest temperature in some northern regions will hit a new low since autumn. In addition to cooling, it also brings strong winds, rainfall and snowfall.

　　On the 10th, the impact of cold air came to an end, but there was still cooling and rain and snow in the northeast. On the 11th, the lowest temperature in Guangdong fell below 10℃, and the lowest temperature in most parts of the province hit a new low in the second half of the year.

　　This is a crisp autumn in October, and the cold air continues to exert its strength. Many places in China have "seasonal cooling". Why? Zhang Tao, chief forecaster of the Central Meteorological Observatory, analyzed that in the first half of the National Day holiday, the subtropical high was unusually strong and had a large influence range, and the highest temperature broke the historical extreme value in some parts of the north and south, showing a warmer trend on the whole. Under such circumstances, a strong cold air cut down from the low altitude of the subtropical high from north to south, the ground temperature dropped sharply, and the cold and warm air confronted each other, resulting in rainy weather along the Huaihe River, and the continuous rainy days led to the coldest day in the same period in history.

　　The recent frequent cold air activities will have an impact on the drought in the Yangtze River basin in China. Peng Jingbei, a senior engineer in lasg, analyzed that, on average, the precipitation in autumn in the Yangtze River basin is less than that in summer. Precipitation often occurs in areas where cold and warm air meet. When the cold and warm air forces are equal, it is easy to have continuous precipitation. However, since October, China has been hit by strong cold air one after another. On October 8-9, windy weather appeared in Beijing and other places, with gusts of 7-9 and local level of 10. Such a strong wind shows that the cold air is strong, and in this case, it is not easy to sustain heavy precipitation in the southern region. "In fact, on October 5-9, the temperature in the Yangtze River basin was more than 4 C lower than normal, but the meteorological drought in the Yangtze River and its south remained."

　　Will it be colder in winter?

　　After experiencing the latest high temperature warning and the earliest cold wave warning in history, many netizens are worried that autumn is already very cold, will it be colder this winter and will it experience extreme cold wave?

　　Earlier in September, the United Nations World Meteorological Organization (WMO) predicted that La Nina, which began in 2020, would last until the end of this year, which would be the first "triple" La Nina phenomenon in the 21st century.

　　In fact, as early as April-May this year, the Institute of Atmospheric Physics of Chinese Academy of Sciences used the scientific apparatus Earth System Simulator to predict that La Nina events will occur for three consecutive years in 2022-2023, and provided accurate prediction and early warning to relevant departments. In the spring and summer of 2022, the sea surface temperature in the tropical Middle East and Pacific Ocean has been in a relatively cold state all the year round, and the coldness has further intensified since autumn. The latest forecast results show that the current La Nina state will continue and develop in autumn and winter in 2022, reaching its peak in winter.

　　Will the influence of the new round of La Nina be greater than that of the past two rounds? Zheng Fei, a researcher at the Institute of Atmospheric Physics of the Chinese Academy of Sciences, said that it is impossible to judge at present. On the one hand, there are few examples of La Nina events for three consecutive years in history, so it is impossible to give a statistical conclusion; On the other hand, the intensity of this La Nina event will be in the category of moderate intensity, and how to develop and influence China’s climate in the future still needs to be predicted continuously to enhance its credibility.

　　At the end of September, Xiao Chan, deputy director of the National Climate Center, said at the regular press conference of China Meteorological Bureau that under the background of global warming, the frequency of warm winters has increased since 1986. In the winter after La Nina incident, there were years when the temperature was low. The main characteristics of the abnormal temperature in winter were: the temperature in most parts of the country was lower than normal, especially in northern North China, southern Northeast China, most of southern China, eastern and northern Southwest China, and most of northwest China. After the La Nina incident, the winter precipitation in China mainly shows as follows: a large range of precipitation is less, especially in the eastern part of Northeast China, along the middle and lower reaches of the Yangtze River, in the southern part of Southwest China, and in northern Xinjiang. There is more precipitation in the northern part of southwest China and the eastern part of northwest China.

　　However, Xiao Chan also pointed out that La Nina event is only one of the external forcing factors that affect China’s winter climate. China’s winter climate is also affected by Arctic sea ice, Eurasian snow and other factors, and the natural variability within the atmospheric system also plays an important role. The Meteorological Bureau will strengthen the judgment and provide more detailed forecast opinions in late October.

　　Zheng Fei believes that under the synergistic influence of La Nina event and the warm Arctic Ocean, the cold air activity in China is likely to continue to be strong this winter, and it is prone to staged low temperature and extreme cold events. At present, based on the warm Arctic sea temperature in the previous period and the possibility of La Nina events in the future, it is predicted that the temperature in some parts of northern China will be slightly lower this winter, which may lead to staged low temperature due to the influence of staged cold air, and the possibility of extreme cold wave outbreak is high; In some parts of the south, there is the possibility of disasters such as low temperature, freezing, rain and snow, so we need to be vigilant and raise our awareness of prevention.

　　Luo Jingjia, a national distinguished professor of Nanjing University of Information Science and Technology, also said in an interview with Modern Express that for East Asia, the winter under the influence of La Nina will be colder. However, the emission of carbon dioxide is increasing, and the degree of coldness may not be so obvious compared with the previous La Ni? a event, which may not cause a very cold winter, but its cooling may be reflected by the occurrence of a cold wave phenomenon. "Therefore, we should pay special attention to the number and intensity of possible cold waves this winter."

　　Expert: Extreme cold events tend to increase.

　　In the past summer, there were rare high temperature and heat waves in all parts of the northern hemisphere. Most parts of China are also shrouded in high temperature, and high temperatures above 40 C continue to appear in many places. Global warming, why is there a strong cold wave?

　　Many experts said that there is no contradiction between strong cold wave and global warming. It is in the context of global warming that the climate is more unstable, with the frequency and intensity of extreme weather events such as rainstorm, high temperature heat wave, drought and flood in summer, extreme low temperature and cold wave in winter increasing. For example, from December 2020 to January 2021, China suffered from extreme cold waves one after another, resulting in large-scale cooling and extreme low temperatures in many places.

　　Zhao Liang, a senior engineer in lasg, told China Newsweek that from the statistics of frequency, in the past 20 years, the number of cold wave days in winter in China showed a downward trend as a whole, but there was a great difference in time and space. Spatially, the reduction of cold wave days mainly occurred in the south, but the number of cold wave days in the north, especially in the northeast, did not decrease. In time, the frequency of strong cold waves is more in the first half of winter, and the reduction of cold waves is mainly concentrated in the second half of winter (February).

　　It is worth noting that since 2008, the average minimum temperature of the coldest winter period in eastern China, that is, the strongest cold wave events every year, is lower than that in the 1980s and 1990s, that is to say, the strong cold wave events have an increasing trend.

　　Zhao Liang further analyzed that the change characteristics of cold events in China are closely related to the important changes of atmospheric circulation and polar system in the northern hemisphere caused by global warming. Among them, the warming of the Arctic in winter and the cooling of the mid-latitude continent — — That is to say, the warm Arctic-cold continent phenomenon is an important change pattern. This phenomenon has an important connection with the outbreak of extreme cold events in mid-latitudes, including China, especially aggravating the strong cooling events in northern China.

　　"With the persistence of global climate anomalies, it seems that the extreme cold (cold wave) event in the northern hemisphere in winter has been ‘ Home-cooked meals ’ . But there is great uncertainty about where and when it will happen, "said Yao Yao, an associate researcher at the Institute of Atmospheric Sciences. The continuous increase of greenhouse gases has made the earth warmer and warmer, and the atmosphere on which human beings depend has become increasingly unstable. For the northern hemisphere, polar vortex will become unstable more easily in winter. Under the guidance of favorable atmospheric circulation system, cold air will break through the westerly jet barrier more easily and frequently, and then be transported to middle and low latitudes, causing extremely cold (cold wave) weather.

　　For the early warning of extreme cold events, Zheng Fei stressed that short-term weather forecast and climate trend forecast for more than two weeks should be strengthened to improve the prevention and early warning of freezing rain and snow disasters. At the same time, agriculture, animal husbandry, energy and transportation industries need to pay close attention to the early warning of freezing rain and snow disasters and formulate effective preventive measures and emergency plans.