Why does the south continue to strengthen rain recently and high temperatures in the north?

Xinhua News Agency, Beijing, June 22: Why does the south continue to strengthen rain recently and high temperatures in the north?

Xinhua News Agency reporter Huang Yan

Recently, the heavy rainfall "entangled" the south, and the high temperature continued to "barbecue" north. Is it normal for this period of time to appear "south and north drought"? Why?

Experts said that since May, the main rain belt in my country has mainly affected South China and Jiangnan, and multiple rounds of heavy rainfall has appeared in succession; in the northern my country, the water vapor conditions have been poor in early April, and the drought of meteorological drought has continued to develop. Development has led to a significant temperature increase, which has caused the recent "southern waterlogging and north drought" situation.

Since June 15, Henan, Hebei, Shandong, Shaanxi Guanzhong and northern Jiangsu and Anhui have appeared in high temperature weather from 35 degrees Celsius to 40 degrees Celsius, with high temperatures above 35 degrees Celsius exceeding 6 days. Monitoring data show that 842 meteorological stations exceed 35 degrees Celsius, of which 520 meteorological stations exceed 37 degrees Celsius and 104 meteorological stations exceed 40 degrees Celsius. At present, high temperature weather in North China Huanghuai and other places continues, and the Central Meteorological Observatory continues to issue high -temperature orange warnings on the 22nd.

On June 21, in Garden Road, Jinshui District, Zhengzhou City, Henan Province, the boy was hydrating after exercise. Photo by Xinhua News Agency reporter Zhang Haoran

Yuan Yuan, chief of the National Climate Center Dating, said that compared with previous years, the time for regional high -temperature weather this year is actually relatively late. Because the early cold air is more active, during the period from May to June, the north is relatively cool.

She analyzed that there are two main reasons for continuous high temperature weather: one is that the northern water vapor conditions are poor, the atmosphere is dry, and the relative humidity is low; The weather began to develop and strengthen.

"In the future, the high temperature in the north will gradually weaken. After the subtropical high -pressure north will be lifted, the area of ​​Jiangnan and South China will be mainly controlled. The high temperature in the south will develop again. Yuan said.

Contrary to the northern "burning roasting", since May, multiple rounds of heavy rainfall in South China, Jiangnan and other places have continuously appeared in the process of heavy rainfall. The process interval is short, the cumulative rainfall has a large amount of rainfall.

Data from the National Climate Center shows that since the beginning of the flood season in South China, since March 24, precipitation has been manifested in the early stage and a large number of later characteristics. From May 10th to June 20th, precipitation was 63%more than the same period of the same year, and it was the most history since 1961. Since the flood in the flood, the average number of heavy rains in the area is 3.9 days, the most since 1961. As of the 20th, the daily precipitation of 16 national meteorological stations in the four provinces of Guoqiong, Fujian, Guangdong exceeded the monthly extreme value, of which Guangdong Shaoguan (286.4 mm, June 19), Fujian Songxi (225.6 mm, June 18) And Guangxi Longsheng (166.9 mm, June 4) broke the largest sun rainfall record since the local building.

On June 21, fire rescue workers shifted to trapped people in Tiechain Village, Zhangjiang Town, Qujiang District, Shaoguan City. (Photo by Zhou Sitao from Xinhua News Agency)

Zhou Bing, chief expert of the Meteorological Service of the China Meteorological Administration, said that the reason why the south has continued to strengthen rainfall, on the one hand, the unstable of the atmospheric circulation system has been strengthened in the background of the global warming, which leads to the increase in streaming activities during precipitation, increased precipitation efficiency, increased rainfall during rainfall, increasing rainfall rainfall. On the other hand, the continuous La Na incident is currently providing an important climate background for the early summer outbreak of the South my country Sea summer. The continuous transportation of water vapor from the Northwest Pacific has affected the South China and Jiangnan area of ​​my country; in addition, at the same time, the water vapor conditions have increased, Eurasia's mid -to -high latitudes of the atmospheric circulation has increased, which affects the frequent cold air activities in the eastern region of my country, especially since June, the cold vortex of Northeast China has even been even more. The active and development of the south, guide the cold air south to affect the south of my country to the south of China to the South China region, and together leads to the abnormal precipitation in South China during the flood season.

The Central Meteorological Observatory predicts that in the future, the rain belt will be raised in the north, and South China will continue to rainfall. Experts remind that with the active typhoon in the future, the south may encounter heavy rainfall again. It is necessary to pay attention to preventing disasters such as floods, landslides, mudslides and urban and rural waterlogging that may cause heavy rainfall.

The latest climate forecast bulletin of the National Climate Center shows that in July, it is expected to be in the central and southeast of the northeast, eastern and southern North China, northern China, northern China, southwestern South China, south of the southwest, northeast, southeast of the northwest, southwestern Xinjiang, southwestern Xinjiang, and southwestern Xinjiang. , Western Tibet and other places are more precipitation than the same period of the same year; except for the temperature in the south of the southwest and southwestern parts of South China, the temperature in the rest of the country is close to the same period of the year to the same period; 2 to 4 tropical cyclones are generated, close to the same period (3.8) to less, of which 1 to 2 tropical cyclones land or affect my country's coastal areas.

- END -