Interview with the former Deputy Director of the China Meteorological Administration: South China heavy rainfall is related to La Nina, which tends to end

Recently, due to continuous heavy rainfall, South China flood prevention situation is severe. What are the causes of extreme rainfall? What are the characteristics of this year's flood season? In this regard, on June 21, Xu Xiaofeng, the former deputy director of the China Meteorological Administration and the chairman of the China Meteorological Service Association. He introduced that the climatic characteristics of continuous rainfall in South China this year, which is closely related to the current La Nina incident that is currently continuing in the East Middle East Pacific. He reminded that extreme drought and floods are easy to accompany. After South China rainfall, you need to pay attention to the might of the defense, and you should also pay attention to the impact of typhoons.

On June 21, fire rescue workers shifted to trapped people in Tiechain Village, Zhangjiang Town, Qujiang District, Shaoguan City. Xinhua News Agency

Extreme rainfall is closely related

Nandu reporters learned that due to the recent heavy rainfall, on June 18th, the dry flow water level in the middle and lower reaches of the Xijiang River Basin in the Pearl River Basin rose again. Formed a large flood.

Xu Xiaofeng told Nandu reporters that the flood season in South China this year is different from previous years, and its characteristics are obvious. The rainfall in South China this year began on March 24, 16 days earlier than usual (April 9). As of June 20, the former flood season in South China has lasted 89 days, 3 days longer than usual, and the cumulative rainfall and heavy rainfall day.

In addition, since the flood in South China, the average precipitation of the four provinces of Guoqiong, Fujian, Guangdong is 32.7%more than the same period of the same year. It is more than 2nd in history since 1961, and the maximum year is 1973. Among them, the average precipitation in Guangxi was the most history since 1961, and Fujian was more than 3rd in history.

"There is a characteristic of precipitation in the flood season before this year, and there are obvious stages." Xu Xiaofeng introduced to Nandu reporters that since the flood, the predecessor of South China during the flood season is a characteristic of less early and later stages. Among them, from April 3rd to May 9th, it is relatively small period of precipitation, with an average precipitation of 27.9%less than the same period of the same year. From May 10th to June 20th, precipitation is 63%more than the same period of the year. History has been the most in history.

Regarding the cause of extreme rainfall, Xu Xiaofeng analyzed the reporter from Nandu that the climate characteristics of continuous rainfall in South China in 2022 were closely related to the current La Nina incident that is currently in the East Pacific. This La Nina incident began in the fall of 2021. "This year is the second year of Lamanina, and the current attenuation is slow and staged." He explained that this year's summer wind explosion in the South China Sea this year is too early and my country's rainy season process is too early. Important climate background.

Strong precipitation is the main reason for the serious recent floods

According to the Central Meteorological Observatory, since June 17, northern and east of Guangxi, northern and western coastal, northern Fujian, western Zhejiang and southern parts, central Jiangxi and southwest, western Hunan, southern and southern Guizhou, central and southern Guizhou The cumulative rainfall in some areas of other places is 100 to 250 mm, 300 to 400 mm in Shaoguan and Qingyuan, Guangdong, and 500-743 mm in Shaoguan and Qingyuan in Guangdong.

According to Xu Xiaofeng, the daily precipitation of 16 national meteorological stations in the four provinces of Guoqiong, Fujian, Yueqiong exceeded the monthly pole value, of which Guangdong Shaoguan (286.4 mm, June 19), Fujian Songxi (225.6 mm, June 18) With Guangxi Longsheng (166.9 mm, June 4), it broke the largest sun rain record record since the local construction station; Hainan Qionghai (251.2 mm, May 1), Guangdong Pingyuan (170.2 mm, May 27) and other 4 The station breaks through the pole of spring.

"The frequent occurrence of extreme rainfall has helped the disaster aggravation." Xu Xiaofeng said that strong water dropping is also the main reason for the recent serious floods.

Nandu reporters learned that recently, the floods have been upheld in many places such as Jiangxi and Guangdong, and streets, houses, and farmland have been flooded. Taking Shaoguan, Guangdong as an example, due to the recent heavy rainfall, a serious flood disaster occurred in Shaoguan City. At 7:00 on June 21 on June 21, the Shaoguan City Three Prevention Headquarters increased the emergency response of flood prevention to level Ⅰ. By 17:30, in addition to the units and individuals who undertake rescue and disaster relief and ensure social livelihood, other units and individuals in the municipal area can perform suspension and shutdown measures.

In Qingyuan, Guangdong, affected by continuous rainfall, the water levels of rivers in Qingyuan continued to rise. According to the monitoring data of the Qingyuan Hydrological Bureau, as of 8:00 on June 21, a total of 25 hydrological (bit) sites in the city were super police, and 8 large and medium -sized reservoirs were overlurred. Beijiang Qianliu Qingyuan section is full of alert water level.

In addition to waterlogging disasters, Xu Xiaofeng also said that the water level in the Pearl River Basin in the Pearl River Basin has brought adverse effects on transportation and agricultural production.

Continuous rainfall in South China tends to end

Nandu reporters noticed that according to the Central Meteorological Observatory, South China continued to rainfall. The Guangdong Meteorological Public Service Center also disclosed that on the 22nd, Guangdong Province's heavy precipitation process will end.

Xu Xiaofeng reminded that the impact of weather changes still needs to be paid to the future. He introduced that it is expected that from June 22 to 30, there are many rainfall in the north, and the rainfall in South China and Jiangnan weakens. Although the heavy rainfall in South China is coming to an end, from the perspective of the country, the rainy season is still in the initial stage. Jiangnan, Jianghuai, North China, Northeast, Southwest, Northwest and other places will further be vigilant.

Xu Xiaofeng introduced that from the perspective of conventional situations, extreme drought and flood easily occurred, and there were more rainfall in the early stage.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.He analyzed that the occurrence of extreme rainfall weather can easily cause uneven distribution of drought and flooding, and should also pay attention to preventing drought prevention while preventing waterlogging.After the rainfall in South China, you need to pay attention to the might of the defense, and you should also pay attention to the impact of typhoons.The rainfall in Jiangnan, Jianghuai, North China, Northeast and other places will begin, and early warning and prevention need to be strengthened.

"In addition, this flood disaster is at the time of early rice pregnancy. It also pays attention to the possible impact on the later crops and grain production." Xu Xiaofeng said.

Source: Southern Metropolis Daily Guangzhou Daily · Xinhuacheng Editor: Su Shiqian

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