China News Agency, Beijing, July 5 (Reporter Chen Su) Since the flood season this year, southern China has experienced continuous rainfall, and severe floods have occurred in many places.
Talking about the cause, Xiao Chan, deputy director of the National Climate Center, said on the 5th that this is directly related to the abnormal atmospheric circulation.
According to statistics from the Meteorological Department, in June, four regional rainstorms occurred in southern China, and the daily precipitation of 12 national meteorological stations including Guangdong Yingde exceeded historical extremes.
During the "Dragon Boat Water" period in South China this year (May 21 to June 21), the average rainfall in Guangdong, Guangxi and Hainan was 472.5 mm, the second most since 1951 and only less than the same period in 2008.
The accumulated rainfall in Damaishan Town, Liannan County, Guangdong reached 1689.2 mm, and the daily rainfall in Guangdong Yingde (292.9 mm) and Shaoguan (286.4 mm), Guangxi Huanjiang (280.3 mm) broke the historical extreme value.
At the press conference of the China Meteorological Administration held on the same day, Xiao Chan introduced and analyzed the recent continuous heavy rains in many parts of southern China.
He said that since the beginning of the flood season this year, southern China, especially southern China, has experienced a large amount of accumulated rainfall, a wide range of influence, a long duration, a high degree of overlapping rainstorm areas, and severe floods have occurred in many places.
"Severe floods in many parts of South China are mainly directly affected by the abnormal atmospheric circulation." Xiao Chan said that since May, the atmospheric circulation in the mid-to-high latitudes of Eurasia has been large in meridional direction, affecting frequent cold air activities in eastern China.
Especially in the first half of June, the northeast cold vortex was more active and developed southwards and strengthened. On the one hand, it guided the cold air to move southward to affect southern Jiangnan and southern China. Water vapor transport mainly affects South China; at the same time, with the onset and establishment of the summer monsoon, the southwest water vapor transport guided by the monsoon circulation continues to be strong.
To sum up, the abnormal atmospheric circulation has led to excessive precipitation in southern China, causing severe floods in some areas.
According to the forecast of the Central Meteorological Observatory, in July, the precipitation in Northeast China, central Inner Mongolia, most of North China, some and southern parts of Northeast China, southern Central China, South China, southeastern Southwest China, and western Tibet was more than the same period of the previous year, among which most of Heilongjiang, Jilin, Liaoning , Beijing, Tianjin, most of Hebei, southern Fujian, Guangdong, Guangxi, Hainan, southeastern Yunnan, and western Tibet by 20% to 50%.
Experts remind that the above-mentioned areas need to strengthen the prevention of the impact of severe weather processes such as heavy precipitation on production and life and secondary disasters that may be caused.
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