What is the reason for June of "Southern Drought in the South"

After a few days of high temperature, in Beijing on June 22, the rain shook the temperature gently. But this trace of coolness just stopped in a short time. On the 23rd, the temperature in Beijing immediately rose to 36 ° C.

However, compared with the 40 ° C temperature in many places in Henan, Hebei, Shandong, and the high temperature of 70 ° C high temperature, it is already a small witch. In Xuchang, Henan, high temperatures over the past few days have caused local cement roads to be "hot". The north of the past few days is like a "iron plate burning".

In the south, it is another scene. Affected by the large -scale heavy -scale precipitation, flood disasters occurred in many places in South China and Jiangnan, and a super police flood occurred in 117 rivers in the Pearl River Basin. The central urban area of ​​Guangzhou appeared in the climax of over 100 years on June 15, and all passenger routes in the urban area were suspended. Netizens said that Guangzhou has become "Guangzhou".

Regarding the "high temperature in the north+heavy rain in the south", netizens said that the rain and rain in the north and the south did not communicate with each other, and felt a completely different summer. "Southern flooding and north drought", is this June normal? Why? The reporter interviewed Yuan Yuan, a researcher at the National Climate Center Climate Forecast Office, Zhang Tao, chief forecaster of the Central Meteorological Observatory, Hu Xiao, chief meteorological analyst of China Weather Network, Zhou Bing, chief expert of the China Meteorological Administration Meteorological Service, and Xu Xiaofeng, president of the China Meteorological Service Association.

Reporter: Is the northern "baking" in June, is it normal? Is it early?

Yuan Yuan: Compared with previous years, the regional high temperature this year has not been advanced. Instead, because the cold air in the first half of June from May to June is more active, the northern region has been very cool. However, after June 15, regional high -temperature incidents occurred in North China and Huanghuai in my country.

Zhang Tao: It is not normal for this season to appear in this season, but for these areas where high temperatures appear, it is an abnormal situation, such as many areas of North China and Huanghuai, including many areas in Shanxi, the highest temperature It has broken through the extreme value of history. Will such high temperature weather appear in the future, it is hard to say, but the country will definitely appear again in high temperature weather.

The truly high -temperature weather has not really started in terms of climate normal. For example, the most typical high -temperature drought weather in Jiangnan usually arrived in July. High temperatures in most parts of the north, such as the high temperature weather in the northeast and northern North China, has not really started.

Reporter: What is the cause of this round of high temperature weather?

Yuan Yuan: Since June, the conditions of the low -rise water vapor in the Huanghuai area have deviated on the low -level water vapor. Most areas are mainly sunny, hot, rainy weather, and less precipitation. Especially after June 15th, high -pressure spine control over the Huanghuai area, and the sinking air flow caused a significant temperature increase effect. At the same time, due to the influence of the solar radiation during the day, the atmosphere was dry, and the ground quickly heated up. The fusion of these factors leads to high temperature weather in the local area.

In the future, high temperature in the north will gradually weaken. After the Northwest Pacific Auxiliary Tropical High pressure north, the deputy high will mainly control the regions of Jiangnan and South China. The high temperature in the south will begin to develop and strengthen high temperature weather with longer duration.

Hu Xiao: This high temperature weather is mainly affected by the eastward and high pressure spine, which leads to the main in the north with sunny heat and rainy weather. In addition, it is affected by short waves of radiation during the sun during the day. The significant high temperature on the surface is mainly caused by strong sun radiation.

Reporter: Will there be more extreme high temperatures this year?

Yuan Yuan: It is expected that in the midsummer (July -August), the southern region of my country is mainly the central and eastern parts of Jiangnan and the central and eastern parts of South China. It may occur with a longer temperature weather process with longer time. In the context of global warming, in recent years, extreme weather and climate incidents have frequently occurred. It is necessary to pay special attention to the occurrence of extreme high temperatures and the adverse effects on people's production and life and energy supply, and take timely defense measures such as electricity protection.

Reporter: Why are there so many heavy rainfall this summer?

Zhou Bing: This year, the heavy rainfall in the south durable and the cumulative rainfall was large. For more than a month, it has always stabilized in South China and Jiangnan. Some areas are raining for 28 days in 30 days. Since May, 10 precipitation process in South China, Jiangnan and other places. According to statistics from the National Climate Center, from May 1st to June 15th, the average rainfall of the regions of Fujian, Guangdong, and Guangxi provinces was the largest in history since 1961.

Recently, the reason why the South China has continued to strengthen the rainfall, on the one hand, in the context of global warming, the unstable of the atmospheric circulation system has strengthened, resulting The incident provided an important climate background for the early start of the South China Sea summer storm and the rainy season in my country. The southwest water vapor transportation guided by the monsoon circulation was relatively stable. , Jiangnan area.

In addition, at the same time, at the same time as water vapor conditions, Eurasian mid -high latitudes of the atmospheric circulation increased, affecting the frequent cold air activities in the eastern region of my country. Especially since June, the cold vortex of the Northeast has become more active and developed south. The south to South China has led to abnormal precipitation during the flood season in South China.

Reporter: When will the continuous rainfall end this round?

Zhou Bing: It is expected that the rain belt will be raised north in the future, and South China will continue to end. The rain belt will jump north to Huanghuai and Jianghuai, and the heavy rainfall weather that lasted more than a month in South China, Jiangnan and other places will eventually weaken, ushering in high rain and high temperature weather. In the upcoming July flood season, the rain belt will be mainly in the north, north of Huaihe River, North China, and northeast. In the future, with the active typhoon, the southern region may encounter heavy rainfall again. It is necessary to pay attention to preventing disasters such as floods, landslides, mudslides, and urban and rural floods that may cause heavy rainfall. Xu Xiaofeng: Although the heavy rainfall in South China is about to end, from the perspective of the country, the rainy season is still in the initial stage, and Jiangnan, Jianghuai, North China, Northeast, Southwest, Northwest and other places will further be vigilant. From the perspective of conventional situations, extreme drought and floods are easy to accompany. In the early stage, there are more rainfall. According to the weather and climate that has occurred, the time and space are abnormal, and the probability of extreme weather in the later period increases.

Reporter: The results of the National Climate Center monitoring show that the La Nina incident, which began in the fall of 2021, is still continuing. Is the recent extreme weather related to the La Nina incident?

Yuan Yuan: The La Nina incident is not the direct cause of the global high temperature in this round, but it is one of the main factors affecting the abnormal summer climate in my country. Judging from the abnormal climate that has occurred at present, this year's South China Sea Summer Storm is relatively earlier than usual, the predecessor and Southwest rainy season in South China began to start early, as well as the early and lower reaches of the Jiangnan and the Yangtze River. The process provides an important climate background.

The La Nina incident, which began in the fall of 2021, continued, and the current attenuation was slow and slightly strengthened in May. The National Climate Center predicts that the La Nina incident will be slightly weakened in summer. The summer equator in the Middle East Pacific in the summer may maintain weak cold water, but the sea temperature will develop again in the fall and winter of this year. In the context of global warming, the atmosphere has become more unstable, and extreme events are in frequent state. (Guangming Daily)

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