Record-breaking temperatures in many places. Why is this year so hot?Experts clear the suspicion of super ferocious large-scale high temperature again

Since July 6, high-temperature weather has occurred in many places in the Sichuan Basin, and even broke the highest temperature record for the year. At the same time, high-temperature weather above 35°C has occurred in Xinjiang, eastern Northwest China, eastern Southwest China, North China, Huanghuai, Zhejiang and other places. .

Meteorological experts said that the high temperature weather has a wide range, strong intensity and long duration. Affected by the westward extension of the subtropical high and the northward lift, the impact of high temperature weather will further expand in the future, and persistent high temperature weather will occur in most areas of the south.

according toChina News WeeklyAccording to the report, in meteorology, when the temperature is above 35 ℃, it can be called “high temperature weather”. If the highest temperature exceeds 35°C for several consecutive days, it can be called a “high temperature heat wave”. High temperature heat wave refers to a period of continuous high temperature process. Due to the long duration of high temperature, it causes people, animals and plants to be unable to adapt to and has adverse effects on a meteorological disaster.

Lv Xuedong, chief forecaster of the Sichuan Meteorological Observatory, said that the current round of high temperature weather in Sichuan Province is mainly related to the long-term control of the mainland high pressure over Sichuan. “Sinking airflow prevails in the atmosphere. When the air block is sinking, the air pressure above is low and the air pressure below is high, and the air block will be compressed, resulting in an increase in its internal energy and temperature. Coupled with the effect of clear air radiation, the temperature rises together. “

China Weather Network pointed out that the North Africa-Iran high pressure will develop eastward and join the continental high pressure, forming an abnormally strong warm high pressure on the western plateau of my country. From July 6th to 8th, it will bring ferocity to the northwest region, the Sichuan Basin and other places. of high temperature. In the future, the North Africa-Iran high pressure and the continental high pressure may even be integrated with the subtropical high pressure, resulting in a large-scale high temperature.

In addition to Sichuan, since July 6, high temperature weather above 35°C has also occurred in Xinjiang, eastern Northwest China, eastern Southwest China, North China, Huanghuai, Zhejiang and other places.

Fu Jiaolan, chief forecaster of the Central Meteorological Observatory and senior engineer at the research level, said that this high-temperature weather process is the most widely affected high-temperature weather this year. It has the characteristics of wide influence, strong intensity and long duration. In some parts of the eastern part of the southwest and other places, the daily maximum temperature will be close to or exceed the historical extreme value for the same period, and the high temperature weather in some areas will last for 10 days or more.

Fu Jiaolan said that due to the influence of the subtropical high extending westward to the north, the influence of high temperature weather will further expand in the future, and persistent high temperature weather will occur in most areas of the south.

The average temperature in my country in June was 21.3°C, 0.9°C higher than the same period of the previous year, the highest in history since 1961. Among them, the temperatures in Henan, Shaanxi, Gansu, Ningxia, Shanxi, Shandong, Jiangsu, and Anhui were all the highest in the same period in history.

Since June 13, the regional high temperature weather process has been maintained, the high temperature intensity is strong, the duration is long, the impact range is wide, and the affected population is large. On June 25, 90 and 29 national meteorological stations in Hebei and Henan provinces reached or exceeded the temperature of 40°C. Among them, Lingshou County in Hebei reached 44.2°C, the highest temperature this year.

Fang Xiang, deputy director of the National Meteorological Center, said that most areas in northern China are under the control of a strong warm high-pressure system, and sinking airflow prevails. During the day, the ground is affected by solar radiation and heats up rapidly. This circulation situation remained stable, resulting in persistent high temperature weather in the northern regions. In addition, the westward airflow sinks and warms up at the foothills of the Taihang Mountains, which also plays an important role in the extreme high temperature weather in Hebei, Henan and other places.

Due to the high intensity and long duration of this high temperature, it will adversely affect power supply, production and domestic water, vehicle travel, and agricultural production. Fu Guerlain suggested that all relevant departments should pay attention to weather forecast and warning information, do a good job in power supply and water resource scheduling, and prevent fires in cities and forest areas. Especially in the middle and lower reaches of the Yangtze River, the high temperature lasts for a long time, and defense work needs to be strengthened.

It is worth noting that, looking at the world, countries such as Spain, Italy, Norway, Japan, Iran and Finland have also experienced high temperature weather recently. Yuan Yuan said that the high temperature weather in India and the United States is closely related to the strengthening of the subtropical high pressure system, while the high temperature in Europe and my country is mainly related to the strengthening of the mid-latitude high pressure ridge.

Researchers from Otto and the World Climate Attribution Group found that the reality of global warming of 1.2°C has so far reduced the so-called return period of extreme heat of similar duration and intensity to those in South Asia to a once-in-a-century.

But as the planet continues to heat up, the intervals between such deadly heat waves will shrink further. If Earth’s average surface temperature rises by another 0.8°C above pre-industrial levels, heatwaves like this are expected to occur every five years, the researchers predict.

The Central Meteorological Observatory continued to issue a high temperature yellow warning at 18:00 on July 9: It is expected that during the day on July 10, there will be 35 High temperature weather above ℃, among them, the highest temperature in parts of central and southern Shaanxi, southwestern Henan, most of Zhejiang, eastern and northwestern Fujian, central eastern and southern Sichuan Basin, Chongqing, northwestern Inner Mongolia, and southern Xinjiang Basin is 37～ 39 ℃, local can reach above 40 ℃.

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