Executive summary:Recently, high temperatures have been rampant in many places in the north. In Xuchang, Henan, the high temperature weather for several days has caused the cement pavement to break, and the pavement is uplifted, looking like it has just experienced an earthquake.
Recently, high temperatures have been rampant in many places in the north. In Xuchang, Henan, the high temperature weather for several days caused the cement pavement to break, and the pavement was uplifted, looking like it had just experienced an earthquake.
In fact, it is not only Henan. Since June 13, my country has experienced the first regional high temperature process this year, which has an extremely wide range of influences. Ai Wanxiu, chief of the Climate Service Office of the National Climate Center, introduced that there are 26 national-level meteorological stations in Inner Mongolia, Xinjiang, Gansu, Ningxia, Shandong, Shanxi, Jiangsu and other places where the daily maximum temperature has exceeded the local historical record in June, but the high temperature in Henan is particularly high. protrude. On June 16, the daily maximum temperature of 59 national meteorological stations in Henan Province reached or exceeded 40°C, of which 11 stations exceeded 41°C, the highest temperature in Linzhou, Henan reached 42°C, and Wugang, Henan was 40.9°C, breaking the annual extreme record. .
Why is this round of hot weather so fierce? Yuan Yuan, a researcher at the Climate Prediction Office of the National Climate Center, said that since June, the water vapor conditions in the lower troposphere in the Huanghuai region have been deviated, and most areas have been dominated by sunny, hot and less rainy weather with less precipitation. Especially after June 15, the sky over the Huanghuai area was controlled by a high-pressure ridge, and the sinking airflow caused an obvious warming effect; at the same time, due to the influence of solar short-wave radiation during the day, coupled with the dry atmosphere, the ground heated up rapidly. The combination of these factors has resulted in high temperature weather in the local area.
Hu Xiao, chief meteorological analyst of China Weather Network, also believes that the high temperature weather is mainly affected by the eastward-moving high pressure ridge, resulting in sunny, hot and less rainy weather in many parts of the north. Conducive to the gradual increase in ground temperature. The significantly higher surface temperature is mainly caused by the strong solar radiation.
The latest report from the World Meteorological Organization (WMO) shows that the ongoing La Niña event is likely to last until at least August, and the northern hemisphere may last until autumn and early winter. La Niña events have affected temperature and precipitation patterns, and have exacerbated droughts and floods in different parts of the world. So, is the global high temperature caused by La Niña?
In this regard, Yuan Yuan clearly pointed out that the slow-decaying La Niña event is not the main cause of this round of global high temperature, but it has affected the establishment of the East Asian summer monsoon and the process of the rainy season in my country, leading to the outbreak of the South China Sea summer monsoon, the pre-flood season in South China and the rainy season in the southwest China. The rainy season in the south of the Yangtze River and the middle and lower reaches of the Yangtze River is relatively early, which also provides an important climatic background for the recent flood disasters in the Pearl River Basin.
Yuan Yuan introduced that the La Niña event that started in the fall of 2021 is still continuing, and the current decay is slow but slightly strengthened in May. The National Climate Center predicts that the La Niña event will weaken slightly in summer, and the SST in the equatorial central and eastern Pacific may maintain a weak cold water state in summer, but the SST will develop and strengthen again in this autumn and winter.
As for whether there will be more extreme high temperatures this year, Yuan Yuan said that it is expected that in the midsummer (July-August), the southern regions of my country, mainly the central and eastern Jiangnan and the central and eastern parts of South China, may have long-term high temperature weather process.
“In the context of global warming, extreme weather and climate events have occurred frequently in recent years, and special attention should be paid to the occurrence of extreme high temperatures and their possible adverse effects on people’s production, life and energy supply, and timely take preventive measures such as power supply. ” Yuan Yuan suggested.
Original title: Experts explain the causes of the highest temperature in many places breaking the extreme value