Why is it "hot" this year? Is it affected by global warming?

The detection of the National Climate Center shows that the whole process of regional high temperature and high temperature in China covers a wide range, lasts for a long time, is extreme and has great influence. As of July 12, the high temperature has lasted for 30 days, covering 502 10000 hectares and endangering more than 9 million people.

Especially on July 7, the high temperature in the south developed rapidly, and Jiangsu, Zhejiang, Shanghai and Chengdu-Chongqing postal areas became the core of high temperature in all parts of the country. The high temperature around 40℃ appeared everywhere, and the historical record of high temperature was constantly shaken off.

Recently, not only in China, but also all over the northern hemisphere. According to the data of National Climate Center of China Meteorological Bureau, in June this year, the global average temperature was about 0.4℃ higher than the long-term one, the highest since 1979. Among them, the temperature in northern Russia, Central Europe and Western Europe is above 2℃, and several big cities in France, Spain, the United States and Japan have updated their high temperature records. Fu, chief meteorologist of the Central Meteorological Observatory, pointed out that since the beginning of 2 1 century, high-temperature heat waves in the northern hemisphere have become more and more frequent in summer, and global warming is the direct cause of high-temperature heat waves.

The sixth analysis report of the United Nations Intergovernmental Panel on Climate Change emphasizes that in the past 50 years, global warming is happening at an unprecedented speed since 2000, and the instability of the climate system is intensifying. UN President Guterres called it "the red alert of mankind".

Authoritative experts from the National Climate Center have shown that global warming is the climate background of high-temperature heat waves in the northern hemisphere, and abnormal atmospheric circulation is the root cause of global high-temperature heat waves since June.

Since June this year, the northern hemisphere subtropical high, the western Pacific subtropical high, the Atlantic high and the Iranian high have all been strengthened in stages, forming a large-scale global warm high pressure zone. Under the control of warm and high pressure belt, downflow prevails, which is beneficial to road surface heating. In addition, under the action of a wide range of high pressure belts, the gas is dry and impetuous, and it is not easy to generate clouds. It also makes the solar radiation source easy to reach the road surface, with high temperature and strong compressive strength, which leads to continuous high-temperature heat waves throughout the northern hemisphere.