The large -scale continuous high -temperature weather in the south has basically ended, and this summer high temperature refresh record

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At present, the large -scale continuous high temperature weather in the south has basically ended. The Western Pacific Auxiliary Tropical High pressure is extremely powerful, which is the most direct cause of high temperature weather this summer. This is related to the overall trend of global warming, and in terms of seasonal scale, it is also related to factors such as abnormalities in the northwest Pacific sea temperature.

At 18:00 on August 30, the Central Meteorological Observatory lifted high -temperature yellow warning, and the large -scale continuous high temperature weather in the south basically ended. This round of high temperature is the strongest high temperature since 1961 with a complete meteorological observation record. The duration, the range of 40 degrees Celsius, and the extremes have refreshed historical records.

This year, the Western Pacific Auxiliary Tropical High pressure is extremely powerful, which is the most direct cause of continuous high temperature weather. What is a subtropical high pressure? Why is the subtropical high pressure of the Western Pacific this year extremely powerful?

The subtropical high -pressure abnormality is the most direct cause of continuous high temperature weather

Recently, strong precipitation in Sichuan Basin, Shaanxi, Chongqing and other places has continued to have continued to decline at high temperatures.

This summer's high -temperature heat wave event began to be early, long, long, large in influence, and strong comprehensive intensity. Meteorological monitoring shows that from June 13th to August 30th, the regional high temperature event lasted for 79 days, with a coverage of more than 5 million square kilometers. There were 23 provinces across the country above 40 degrees Celsius. Real or break through the historical pole value.

Due to the long temperature duration, some rivers are dry in the main flood season. In the Yangtze River Basin, many water levels have recorded the lowest history since the record, and the Dongting Lake and Poyang Lake have been "died" in advance. At the same time, high -temperature weather has also brought various adverse effects on people's production and life, such as surge in power demand, decline in hydropower capacity, blocking agricultural production, and fires in forests.

Chen Tao, chief forecast at the Central Meteorological Observatory, said that this year's Western Pacific subtropical high -pressure range is large and strong, which is the most direct cause of sustainable high temperature weather. Under its control, the southern region of my country is controlled by the sinking air, and the sky is clear and cloudy. Under the influence of sunlight radiation during the day, the near the ground was heated strongly, and the heat was stranded on the ground.

Not only in our country, the northern hemisphere this summer, the Western Pacific subtropical high -pressure, the Atlantic subtropical high -pressure, and Iran's high -voltage average enhancement, forming a large -scale global heating high -pressure zone, forming high temperature weather in the northern hemisphere in many places.

"High -temperature heat waves occur in summer, which is normal from the perspective of climate. But this summer's high -temperature heat wave event continues time, intensity, and influence, which has reached a strong level." Chen Lijuan, chief forecaster of the National Climate Center, analyzed The continuous atmospheric circulation is abnormal is the "culprit" of continuous high temperature. This year, the Western Pacific Auxiliary Tropical High pressure is abnormal and abnormally extended to the west. At the same time, the southern and north borders of the subtropical high -voltage are expanded, and the area is very large. In summer, the high temperature incidents in most southern my country last longer, and the end time is obviously later than usual.

The powerful auxiliary high belt blocked the water vapor on the low latitude ocean to the south

What is the subtropical high pressure? Why is it often in the high temperature and heat summer incident? Why is it extremely powerful this year?

Zhang Daquan, a senior engineer of the National Climate Center Climate Forecasting Room, introduced that the high -pressure subtropical high pressure that everyone is familiar to my country generally refers to the auxiliary tropical high pressure on the northwest Pacific Ocean that has a greater impact on China. It exists all year round. And the less warmth is deep system. Due to the strong solar radiation in the equatorial area, the atmospheric heating rises, and the north -south pole flow with lower temperature. Under the influence of the earth's rotation, it sinks near 30 degrees north and south latitude, and then the airflow returns to the equator, forming a atmospheric ring flow, known as the Hadle Ring. When the airflow sinks in the subtropical area near 30 degrees north and south latitude, a subtropical high pressure is formed.

Influenced by factors such as sea and land distribution, the northern hemisphere subtropical high -pressure band is divided, with several high -pressure monomers, namely the North Pacific high pressure, the North Atlantic high pressure, and Iran's high pressure. The climate has an important impact. The staged "north jump" is directly related to the rainy season of the monsoon area of ​​the eastern part of my country and the position of the rain belt. The abnormal progress and stability maintenance are an important factor that leads to abnormal weather and climate in my country. After the end of the "Meiyu", the main body of the Xitai is directly controlled by the middle and lower reaches of the Yangtze River. The sinking air flow causes sunny and hot clouds.

This year, the high -pressure high -pressure high -pressure is extremely powerful, which has led to the continuous high temperature and rain in the Yangtze River Basin, which is stronger and stronger than the annual high temperature drought. From the perspective of influencing, on the one hand, it is related to the overall trend of global warming. On the other hand, in terms of seasonal scale, it is also related to the abnormal heat of the Qinghai -Tibet Plateau, the phenomenon of La Nina, and the abnormal sea temperature of the Indian Ocean and the northwest Pacific.

This summer, the Qinghai -Tibet Plateau has a significant heating effect. The high pressure of South Asia over the Qinghai -Tibet Plateau is extremely strong. The powerful sub -high belt blocked the water vapor on the low latitude ocean to transport to the southern region of my country, and the high temperature and rain were continued to be high -temperature and rained by the sub -high -control area. From the perspective of marine conditions, this summer is in the state of Rana, the Eastern Middle East Pacific Sea temperature is extremely low, and the west Pacific and South China Sea temperatures are high. The abnormal tropical sea temperature through sea gas is conducive to the continuous and large vice -high height of the Western Pacific, which leads to a wide range of high temperatures this year. Huanghuai, Jianghan, Sichuan and Chongqing and other places are covered. Improve the awareness of adapting to climate change, and actively deal with

Chen Lijuan believes that the extreme characteristics of high -temperature incidents this year are closely related to the background of climate change.

In the sixth evaluation report of the Special Committee of the UN Government Climate Change (IPCC), in the context of global warming, many changes in many extreme weather climate events have been observed since the middle of the 20th century. Characteristics.

"This is a warning for us, reminding us to understand climate change more deeply and improve the ability to adapt to climate change from various aspects." The ability to respond to climate risk and disaster reduction is increasing. But on the other hand, it should also improve the awareness of adapting to climate change in the whole society. ","

Experts explained that in the context of climate warming, the high -temperature heat wave this summer broke the historical record and has a certain extreme. However, from the perspective of climate -cyclical laws, due to the self -regulating function of the earth's climate system, the rise in the probability of extreme events does not mean that extreme events of the same type occur every year.

On the other hand, with the development of society and economy, the demand for meteorological services in the country and various industries has continued to increase. This requires the meteorological department to further improve the accuracy rate of forecasting. At the same time Risk predictions can facilitate the decision -making department and the public to respond to climate change more scientifically and effectively.

Source: People's Daily

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