News about extreme cold weather

After Beijing's first cold wave warning on the 8th in two years, the temperature slowly warmed up.

Today's Lantern Festival coincides with a strong cold air affecting Beijing, and there will be a northerly wind of five or six grades, which will bring about a temperature drop of 6℃-8℃.

Yesterday, Beijing Meteorological Observatory issued the first blue warning signal of cold wave since 20 10 to remind the public to prepare for cold, wind and fire prevention.

The first cold wave warning in two years

Last night, a strong cold air from Siberia entered Beijing, and it will affect Beijing from day to night today.

Yesterday 17, the municipal meteorological observatory issued a cold wave blue warning signal, which is the first cold wave blue warning signal since the winter of this year and the first cold wave warning signal since 20 10 and 19. You, the chief forecaster of the Municipal Meteorological Observatory, explained that when the temperature drops above 8℃ within 48 hours and the wind reaches level 5 or above, a blue warning signal of cold wave will be issued.

There will still be a northerly wind of three or four tomorrow.

The explanation is that the highest temperature in the southern suburbs observatory reached 4℃ yesterday, but it will drop to -3℃ today, and the lowest temperature was only -5℃ yesterday, but it will drop to-12℃ tonight, with a cooling range of 7℃. On average, the cooling rate will be greater.

It is estimated that the wind will be around five or six in the daytime today, and it will remain strong in the first half of the night after entering the night, and will obviously weaken in the second half of the night, but there will be about three or four northerly winds tomorrow and the day after tomorrow. Under the influence of strong wind, the somatosensory temperature will drop several degrees today.

After 8 days, the temperature slowly warmed up.

The city's professional meteorological observatory reminds the public that in addition to cold and warmth, to prevent colds and other diseases, it is also necessary to prepare for wind and fire prevention. Due to the strong wind, the fire risk level has also entered a highly dangerous level. Today is the last day to set off firecrackers. Try to choose an open and safe place to set off firecrackers.

You Feng Chun said that the biggest impact of this cold air is today's daytime and the first half of the night. After the cold wave, it is estimated that the temperature will slowly rise after the 8 th. "There was weak cold air on the 7th and 8th, but it was not too strong. After this cold wave, there were no signs of strong cold air until 13. "

-Explore the reasons

"Global warming triggers a cold wave"

Experts say that it is difficult for sea water to freeze in winter, which affects the changes of atmospheric pressure and circulation in the Arctic.

From 20: 00 yesterday to 20: 00 on the 7th, there will be a large-scale gale cooling weather in the central and eastern regions of China from north to south, which is the first strong cold air affecting the central and eastern regions of China since the Year of the Loong. There will be a temperature drop of 6℃-8℃ in most parts of the country, with the temperature drop range of 10℃- 12℃ in some areas and 14℃ in some areas.

Many countries in the world are experiencing a cold wave.

At the same time, extreme cold and heavy snow appeared in Europe and Northeast Asia. Some cities in Croatia have declared a state of emergency, while the temperature in Warsaw, Poland is the lowest in the past 20 years, with 45 people dying from the cold, 122 in Ukraine, more than 260 people dying from extreme cold in Europe, and 63 people dying from heavy snow in Japan this winter.

Extreme cold weather caused by global warming

In view of the extreme cold weather in the northern hemisphere, the China Meteorological Bureau said that it was mainly affected by the Arctic Oscillation.

Chen Yongli, an associate researcher at the Institute of Oceanography, China Academy of Sciences, said that the current mainstream view in the world is that extreme cold weather is caused by global warming.

It shows that under the general trend of global warming, the sea water in the Pacific Ocean absorbs a lot of heat in summer, which makes the sea ice in the Arctic change in winter, and it is difficult for the sea water to freeze in winter, which further affects the pressure and circulation changes in the Arctic region, that is, the word "Arctic oscillation".

-Pay attention to PM2.5

The north wind is strong or blows away fireworks and dust

As of 2 1, the daily average value of PM2.5 has reached 182 μ g/m3, and the peak of fireworks will be ushered in tonight.

Although it was not the Lantern Festival yesterday, many people started filming. Judging from the fine particulate matter index, the air quality was not good all day yesterday.

The daily average value of PM2.5 exceeds the standard.

Although according to the current national standards, the average value of PM 10 of inhalable particulate matter reached the standard at 12 yesterday, and the overall air quality was "good", the reporter observed that as of 2 1 last night, the daily average value of PM2.5 at Chegongzhuang Station was 182 μ g/m3, which exceeded the new standard of 75 μ g/m3.

At present, it is not known whether the excessive PM2.5 yesterday was related to the fireworks. On the concentration curve, it has been in a relatively stable state since 3 am yesterday, all of which are above 83 μ g/m3.

Favorable diffusion conditions brought by the north wind

Tonight may usher in the third round of fireworks display peak during the Spring Festival. The first two peaks brought about a sharp increase in PM2.5 concentration.

But tonight's strong north wind may blow away instantaneous particles and pollutants. At least in the daytime today, according to the forecast of the Municipal Environmental Monitoring Center, under the northerly wind of about five grades, the diffusion conditions are favorable and all districts and counties can reach "excellent" or "good".