What is the reason for the increase in rainfall?Is it related to climate warming?

Recently, the "heavy rain mode" has been opened in many places across the country

Rain in the rain, keep the next time

The hot search on Weibo also turns in turn

Netizens can't help but ask questions

Is it omitted on this day?

Call the son -in -law online to "make up the sky"

On the afternoon of July 5th, the Beijing Meteorological Observatory issued a heavy rain blue warning signal. It is expected that from 16:00 to 09:00 on the 5th, a strong precipitation with an hour's rainfall of more than 30 mm will occur in most parts of Beijing.

Picture source: Chinese weather

At 13:00 on July 5th, the Henan Meteorological Bureau issued a class III warning report. Wait for many places to release heavy rain red warning signals.

At 17:47 on July 5th, the Hebei Meteorological Observatory issued a heavy rain blue warning signal.

Since June 1, the average rainfall of Jilin province has a average rainfall of 218 millimeters, which is 2.3 times that of rainfall. It is the first in the meteorological record in 1951.

On July 5th, at the regular conference held by the China Meteorological Administration, Wang Yawei, deputy director of the Emergency Disaster Subject and Public Services Department of the China Meteorological Administration, reported that the national average precipitation in June was 112.1 mm, which was 9.1%more than the same period of the same year; Liaoning and Shandong's precipitation is the most historic. Especially from late May to early June, a relatively severe rain and flooding disaster in South China has occurred, and the public is quite concerned. What are the reasons behind the increase in rainfall, and is it related to climate warming?

There are severe floods in South China, and the atmospheric circulation is abnormal is the main cause

Xiao Yan, deputy director of the National Climate Center, responded that the severe floods in South my country in China were mainly directly affected by the abnormality of the atmospheric circulation.

Xiao Yan explained that since May, Eurasia's high -latitude circulation has a large direction, which has affected frequent cold air activities in the eastern region of my country. Especially in the first half of June, the cold vortex in the Northeast was more active and the development of the south. On the one hand, the cold air south affects the south of my country to South China. Water vapor transportation mainly affects South China.

At the same time, with the outbreak and establishment of the summer wind, the southwest water vapor transport guided by the monsoon circulation has continued to be strong. In summary, the abnormal atmospheric circulation has led to the number of South China precipitation that causes severe floods in some areas.

North China has a lot of rainfall, which is mainly affected by the La Nina incident

According to the Central Meteorological Observatory, from July 5th to 7th, the "Siaba" residual circulation will continue to go north. Affected by its and the West Wind Belt System, a huge rainfall will run through the north and south of my country. As heavy as heavy rain.

Xiao Yan said that comprehensive judgment, the rainy season in North China this year is too early and there are too many rainfall. The most important reason is that it is affected by the La Nina incident.

The British "Nature" magazine published a few days ago. Meteorologists have predicted Lanna for the third consecutive year, that is, rare "triple" La Nina climatic incidents may occur.

Xiao Yan introduced that La Nina phenomenon is the manifestation of the heat of the ocean, that is, the abnormality of the seawater in the central and eastern Pacific becomes cold. This phenomenon affects the global climate. At present, the phenomenon of Rana is still continuing, and its decay has been slow since spring. It is expected that the midsummer (July-August), the cold water of the Equal Middle East Pacific will be briefly attenuated, but it will still maintain La Nina or a neutral cold state. It is expected that in the later period, cold water in autumn and winter is more likely to strengthen again.

Historically, there have been similar La Nina phenomena for three consecutive years, including 1998-2001, 1983-1986, 1973-1976. What impact will it have on my country? Xiao Yan pointed out that the following summer in most La Nina incidents, East Asian summer was strong, and the Western Pacific subtropical high -pressure was easy to north.

However, Xiao Yan also said that the scope, center, strength and other differences in the rainyst areas in the north are also very large. The main reason is that it will be subject to the intensity of the La Nina incident itself, the position of its cold sea temperature center, and the trend of different development and evolution in spring and summer. There are also various factors such as sea temperature, plateau snow, and Arctic sea ice, and atmospheric seasons in other sea areas (such as Indian Ocean, Atlantic Ocean, etc.).

Xiao Yan emphasized that among the examples of the La Nina incident in three consecutive winter, the positions of the main multi -rain areas in my country in summer are also different, which once again proves the complexity of the La Nina incident on my country's summer climate.

Due to the small sample volume, the continuous Rana incident has less research on my country's climate, and it needs to continue to be deepened. (Reporter Fu Lili)

Source: Technology Daily WeChat public account

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