Why is it so hot this year?Extremely high -temperature super long standby in many places in my country

Recently, the heat waves and hot weather have made many people miserable. Especially in the southern region, the hot and humid feeling makes people look like in the steamer. When they go out, they sweat and have to get into the air -conditioned room to hide.

This year's hot and hot this year, what caused this situation? When is the high temperature? Let's listen to the authoritative interpretation of the National Climate Center.

900 million people are affected by high temperature

According to the monitoring of the National Climate Center, in the past few days, my country has encountered high temperature weather. At present, high temperature incidents have continued for more than 30 days, affecting the population of more than 900 million people. In June this year, the global average temperature was about 0.4 ° C higher than the year, the highest since 1979.

As of July 12, the high temperature days of some cities have exceeded one month, such as: Henan Luohe (33 days), Huaxian County, Shaanxi (31 days), and Xinjiang Yishan (36 days), Lake Lake (33 days), Xinjiang Turpan and Tocoson even reached 42 days.

Compared with the same period of the same year, the number of high temperatures in the above areas is generally 5 to 10 days, of which Henan, Hubei, Shaanxi, Anhui, Shandong, and Jiangsu are more than 10 days. It can be said that these areas are much hotter this year.

At the same time, high temperature extremes are stronger than previous years. The highest temperature of 71 national meteorological stations in the country broke through the historical pole, of which Hebei Lingshou (44.2 ° C), Tancheng (44.1 ° C), Zhengding (44.0 ° C) and Yunnan Yanjin (44.0 ° C) daily reached 44 ° C 44 ° C above.

From June 13, 2022 to July 12th, the national extreme highest temperature distribution (picture source: National Climate Center)

Since entering the 21st century, the typical years of continuous high temperature events in my country are 2003, 2013, 2017, etc. Generally speaking, this year's high temperature incident starts earlier than the above years, but the number of duration and historical extreme stations is not as good as these three years. Although the scope and the highest temperature in the single station are not as good as 2017, it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003. And 2013.

Reason for frequent high temperature heat waves: global warming and atmospheric circulation abnormalities

The sixth evaluation report of the Special Committee of the United Nations Intergovernmental Climate Change (IPCC) pointed out that in the past 50 years, global warming is undergoing unprecedented speeds in the past 2000. This is the frequent climate background of the high -temperature heat wave event in the northern hemisphere. Abnormalities are the direct reasons for frequent high -temperature heat waves around the world since June.

Since June this year, over the subtropical regions of the northern hemisphere, the Western Pacific subtropical high -pressure band, the Atlantic high -pressure belt, and the high -pressure average of Iran have enhanced, thereby forming a large -scale global heating high -pressure belt.

Picture source: CCTV News

Under the control of warm and high voltage bands, the prevalence of sinking air is conducive to the heating of the ground. In addition, under the action of a large -scale high -voltage belt, the air is dry and the cloud is not easy to form. , And strong intensity, which causes high temperature heat waves in the northern hemisphere.

Specifically, in my country, the continuous La Nina incident has provided an important climate background condition for the development of high temperature in the south since June of this year. Especially in July, the development of heating and high pressure bands in the middle latitude was strengthened, resulting in large -scale high temperature weather. The phenomenon of Rana, also known as anti -El Niopy, refers to the large range of seawater in eastern and central equatorial Pacific. Starting from October last year, Rana has begun to appear in the tropical Pacific Ocean, and this year's La Na phenomenon has been significantly weakened around April, but the atmosphere still has a lagging effect.

According to statistical analysis, in the summer of most La Nina incidents, the Western Pacific subtropical high -pressure (referred to as auxiliary high) was easy to north. Since late June this year, the deputy high north, especially the typhoon "Siaba" in early July, has strengthened the west extension, Iran's high pressure east, and combined with the high pressure of the mid -latitude continent to form stability over my country. The heating high pressure zone, which causes a large range of high temperature weather.

In addition, due to the water vapor carried by the vice -high high, the humidity of the central and eastern regions of my country makes the body feel higher.

When is the high temperature?

When will the high temperature be relieved? There are two treasures to become cool in summer, one is a typhoon, and the other is rainfall, especially the thunderstorms that occur in the afternoon in the summer afternoon. At present, the typhoon that may land in my country has no news, and the large -scale cooling is still far away. However, once the subtropical high pressure is weakened, the chance of thunderstorms in the local area will greatly increase, and it is possible to enjoy a brief cooling in some places.

It should be reminded that according to the forecast of the Central Meteorological Observatory, after the 21st, the high temperature in the south will develop again and the scope will expand. The highest temperature in Fujian, Jiangxi, and southern Zhejiang can reach 39 to 41 ° C. The National Climate Center also predicts that in the next 15 to 30 days (July 27 to August 11, 2022), the temperature of the temperature in most areas in most China is higher than the same period of the year. Heat waves have an adverse effect on people's production and life and power supply.

Produced: Popular Science China

Production: Ye Haiying (China Meteorological Bureau Meteorological Propaganda and Popularization Center)

Producer: China Science Popularization Expo

Edit: Wang Tingting

The China Science Popularization Expo is the Science Popular Science Platform of the Chinese Academy of Sciences. It is sponsored by the Computer Network Information Center of the Chinese Academy of Sciences. Relying on the high -end scientific resources of the Chinese Academy of Sciences, it is committed to spreading cutting -edge scientific knowledge and providing fun science and education services.

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