The northern hemisphere has refreshed high temperature poles in many places. Why does the world enter the roasting mode?

Northern hemisphere refreshes high temperature poles in many places

"Two years ago, British weather researchers conducted an interesting prediction: What would British weather like in 2050? As a result, the prediction results accurately became a reality -just 28 years in advance." American cable TV news news The network (CNN) described the huge impact brought by the current unprecedented heat waves that swept the UK.

According to the British Sky News Network on the 18th, the Britain has released the first extreme high -temperature red alert in history. The highest temperature in some areas of the United Kingdom will exceed 40 degrees Celsius on the 18th and 19th. The asphalt runway of the largest Air Force base in the United Kingdom and the Royal Bridononon Air Forton Air Force has also melted at high temperatures, and has to stop flying. Even the railway was distorted at high temperatures, and the entire Railway Network of the United Kingdom had implemented speed limit since noon on the 18th.

Mark McCarthy, head of the National Climate Information Center of the British Meteorological Administration, said that the rapid air flow from the east to west of the high altitude of the northern hemisphere connects the heat waves of the two continents of Europe and North America. In addition to Britain, continental Europe also face unprecedented high temperature roasting. Hot air accumulated over North Africa before, and then entered Spain north. High -temperature gas balls quickly enlarged France and Central Europe. Continuous low -pressure zones centered on Western Portugal helped hot air to move north along the counterclockwise airflow.

CNN said that due to this, the maximum temperature in northern and central France may reach a peak of about 40 degrees Celsius, and it is expected to have high temperatures in western Germany. The report emphasized that European cities have not been prepared to a large extent for extreme high temperatures. Affected by the "heat island effect", the situation of urban residents may be particularly dangerous, because there are a large number of asphalt, buildings and highways in the urban area, they absorb solar energy and then radiate more heat, amplifying the hazards of heat waves. More than 1,100 people in Spain and Portugal died of high temperature.

High temperature causes American crops to wither (CNN)

The North American continent also encountered rare high -temperature heat waves. CNN said that hundreds of monitoring stations in southern and eastern United States this week may refresh high temperature records. The temperature in the central and western United States and the south will rise to a dangerous high temperature level, and then the extreme high temperature will spread along the Gulf of Mexico towards Texas. The United States "New York Times" said that nearly 20%of the US population will go through the high temperature of more than 100 bria (about 37.8 degrees Celsius). The temperature of many large cities including Minnespois, Chicago, Nashville, Memphis, Dallas, New Orleans, and Atlanta may be close or higher than 100 Huali.

China Central Meteorological Observatory also reported on the 19th that since July, with the influence of the Western Pacific subtropical high pressure, under the influence of factors such as the atmospheric and clear air radiation and sinking heating, etc. The highest temperature in many places reaches or breaks the historical pole value. It is expected that from the 21st, the high temperature weather in the south of China will develop again, and the subsequent high -pressure will also be opened with Iran's high pressure, which means that the deputy high is very strong. From July 21st to the end of July, the Sichuan Basin, Jianghan, Jianghuai, Jiangnan, Jiangnan, South China and Xinjiang Southern Xinjiang Basin, western Inner Mongolia and other places will have a large range of high temperatures with a large range of 35 degrees Celsius. The maximum temperature in western Inner Mongolia and other places will exceed 40 degrees Celsius.

Ren Guoyu, the chief expert of the China National Climate Center Climate Change and a part -time professor at China University of Geosciences (Wuhan), said in an interview with the Global Times reporter on the 19th that high -temperature heat waves in the northern hemisphere recently occurred in Europe and North America, and East Asia occurred in the Yangtze River in my country in China. Downstream, South Korea and Southern Japan. He emphasized that high -temperature heat waves in the middle and lower reaches of the Yangtze River in Europe and China are the result of the common effect of multiple atmosphere and environmental factors. Global climate change should help increase the frequency and intensity of high -temperature heat waves; abnormal atmosphere, ocean, and land surface conditions are direct factor in high -temperature heat waves in central and western Europe and East Asian subtropical regions. For example, the continuous high -temperature heat waves in the middle and lower reaches of the Yangtze River are related to factors such as the Western Pacific subtropical high -pressure biased high pressure and its Asian summer wind and less rain precipitation in the middle and lower reaches of the Yangtze River. East Asian summer wind is strong. Generally, there are more precipitation in the north, and the premium during the main flood season in the middle and lower reaches of the Yangtze River is less. Due to the low precipitation of Mei Rain this year, the amount of clouds during the drought during the rain after the end of the rain, strong solar radiation, and the short period of Meiyu last year. The precipitation was less than the usual year. The middle and lower reaches of the Yangtze River recently appeared. Factors are conducive to enhancing high -temperature heat waves.

Related to the peak period of solar activity?

The changes in the earth's weather are in the final analysis of the heat changes from solar radiation. At the peak of the solar activity this year, is it related to the extreme high temperature weather in many places?

According to the US "Space News" website, the solar activity changes periodic changes from low tide to peak periods. About 11 years apart, the north -south magnetic pole of the solar magnetic field is turned once. Although the reasons for the change of the solar magnetic pole are unclear, the transformation is in line with the peak period of the solar activity. Variety. The prediction of the National Aeronautics and Space Agency shows that the 25th solar cycle of human statistics began in December 2019 and is expected to reach its peak in mid -2025. But since 2020, scientists have found that the degree of activity of the sun is significantly higher than expected, and this year may have reached its peak. Scott Mcingtos, a solar physicist at the National Atmospheric Research Center, acknowledged that the current scientists have very little understanding of solar activities. The number of sunspots in the solar is predicted to predict that there is indeed deviation in the periodic activity of the solar cycle. Therefore, there are people in social media at home and abroad. Is the abnormally active of the sun this year related to the encounter with extreme high temperature in the world? Ren Guoyu told a reporter from the Global Times that the scientific community's impact on the influence of solar activities on short -term weather and climate abnormal research, and also lacks research, but has some research results on long -term climate change and low -frequency climate change. It is generally believed that from 1645 to 1715 was the period of silence in the sun. important reason. Some studies believe that since the 21st century, the middle latitude zone of the northern hemisphere continent, especially the inside of the Asian continent and the central and eastern North American continent, has stagnated climate warming. Reduce related. But in general, the impact of the climate in the climate of the solar activity and the changes in the radiation of the solar output is not enough.

The British "Guardian" said on the 18th that high temperatures that have encountered many times this year have not occurred in natural records this year. For example, the latest research shows that "the impact of humans on the climate, especially greenhouse gas emissions, has increased the possibility of South Asian heat waves that have occurred in South Asian heat waves. 30 times ". Wikiopon Thompson, a climateist at the University of Bristol University, explained: "Climate change is making the world's heat waves hotter and longer duration. Scientists have proved that many specific ones caused by humans, many specific ones, many specific ones The heat waves are more intense. It can even monitor the signal of climate change from the number of deaths caused by the heat waves. "

Will there be more and more weather?

According to data from the National Oceanic and Atmospheric Administration, as of July 12, 79 high temperatures in the United States had a new record of refreshing records, and globally, it broke the 150 historical high -temperature records. Professor Gabriel, a professor of climate and global science at Princeton University, believes that this is a signal of the climate crisis. According to data from the U.S. Environmental Protection Agency, in the 1960s, the United States encountered an average of twice a year in the United States, but by the first 10 years of the 21st century, an average of 6 times a year.

Will we encounter more and more extreme weather in the future? Ren Guoyu said that extreme weather and climate change is a more complicated problem. The academic research has various conclusions, and the public's cognition is relatively vague.

He said that first of all, the facts of the extreme weather and climate change have different views. The general view is that in the context of global warming, extreme weather and climate events global and regional scale increased. However, the global climate warming has been warming in the past 100 years, especially the most obvious warming for more than half a century, not all extreme weather and climate events have increased. For example, in China, there are some extreme weather and climatic events (including high temperature, short -term heavy precipitation), but others (including low temperature and cold waves, heavy wind days, sandstorms, thunderstorms, hail, etc.) have decreased, which affects the greatest extreme weather. Climate events have generally decreased.

Since entering the 21st century, it has only been more than two decades. The northern hemisphere includes the increasing trend of extreme weather and climate events in eastern North America and East Asia, but this increase is in a new context of slowing climate warming in the northern hemisphere. East Asian mid -high latitudes such as high temperature, cold waves and rainstorms are frequent, and the average temperature in winter and spring and even decreases. "Of course, the changes in the past 20 years are likely to be the performance of natural changes in the climate system for many years, and may not necessarily represent the climate trend in the future."

Ren Guoyu said that the rapid urbanization of the eastern part of my country in the past 40 years has also caused a certain impact on some extreme weather and climate events in urban areas, which has caused more and more high -temperature heat wave events and less and less low temperature and cold tide incidents. One of the reasons for the increase in short -term precipitation incidents in some large cities.

Therefore, in the past hundreds or decades, the trend of changes in extreme weather and climate worldwide and regional extreme weather is more complicated than the current perception. According to existing research, in general, it cannot be generally said that "the increase in extreme weather and climate events in the global or regional warming" will continue to increase in the future. In the last six or seventy years of meteorological observation data and the most obvious global climate warming, at least in China, the frequency and intensity of most extreme weather and climate events have declined.

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