Global warming, frequent extreme weather

Global climate warming is a sentence that people often hear. However, in recent days, extreme weather such as blizzards and heavy rains have occurred in many countries in Europe, America, and Asia. Beijing has suffered the worst weather in the same period in 60 years. Blizzards hit record lows. Didn’t last year’s Copenhagen conference always talk about global climate warming? Why is the climate unusually cold? The topic of climate change continues to become the focus of the world's attention as extreme weather continues to occur. Continuous heavy snowfall in the north set a record for the same period in history. The first heavy snowfall in 2010 was not unexpected. As early as a few days ago, the Beijing Meteorological Observatory made a forecast of moderate snow on January 3, 2010. On January 2, the forecast was changed to heavy snow. At 3:20 a.m. on January 3, the Beijing Meteorological Observatory issued a blue blizzard warning; at 8:50, the meteorological department raised the blue blizzard warning signal to a yellow warning signal. It is reported that this is the first time that Beijing has issued such a high-level snowstorm warning since the beginning of winter in 2009. According to meteorological experts, the snowfall in Beijing and Tianjin on January 3 both exceeded the historical extreme values ??for January since 1951. Sun Jun, chief forecaster of the Central Meteorological Observatory, said in an interview that the main reason for heavy snowfall in Beijing, Tianjin and Hebei and other places is a relatively strong cold air coming down from the Mongolian Plateau, while the water vapor conditions in North China are relatively abundant. When the cold air comes down, Water vapor rises, bringing precipitation. "Because the temperature in North China is relatively low, the precipitation is mainly snowfall." This winter, many areas in northern my country experienced particularly early and heavy snowfall. This is not only the feeling of the people, but has also been scientifically confirmed. Dr. Xiao Fengjin, deputy director of the Climate Application and Service Office of the National Climate Center, told reporters that this time Beijing, Hebei, Shanxi, Shaanxi, Henan and other places encountered heavy snow, which generally showed two characteristics: First, it came early. Taking Beijing as an example, The annual average first snowfall is at the end of November, but this time it was almost a month earlier, setting a record in 22 years; secondly, the intensity was high, with the amount of snowfall in the snowfall area reaching a once-in-60-year level, and in some areas exceeding the once-in-a-century mark. According to reports, the snowfall in my country is closely related to the recent atmospheric circulation characteristics. In October 2009, cold air activities were frequent in the high latitudes of the Northern Hemisphere, which continued to cause severe cooling and rain and snow in North America and Europe. Since late October 2009, the cold air has moved eastward and southward, affecting northern my country. At this time, the easterly airflow in the Pacific Ocean [11.67 -1.85%] is strong, transporting a large amount of water vapor inland, and the high-pressure airflow in the south is weak, unable to prevent the water vapor from moving northward. In this case, the convergence of warm and cold air creates better dynamic conditions, thus causing widespread heavy snowfall. Although the first snowfall occurred earlier this year in many areas of the northern hemisphere, giving people a "colder" feeling, this is not inconsistent with the trend of global warming. Relevant experts said that although the current trend of climate change is global warming and higher temperatures, weather changes will fluctuate and will not develop smoothly. There will also be extremely cold weather during certain periods of time. Because climate warming will cause a large amount of seawater to evaporate and increase water vapor in the atmosphere, a large amount of water vapor will turn into blizzards when encountering cold currents. Therefore, global warming can actually lead to the frequent occurrence of extreme weather and climate events. Zhang Qiang, director of the Climate Impact Assessment Office of the National Climate Center, also said that under the background of global warming, in general, cold air activities have indeed weakened, and cold weather events have an overall decreasing trend, but occasional extreme cold air and heavy snowfalls are not ruled out. Disasters can happen suddenly. Under the background of climate warming, low-level air has become significantly warmer, atmospheric instability has increased, and strong convective weather has increased. The probability, time, scope, and region of extreme meteorological disaster events that occurred once in a century or in decades have greatly changed. With great changes, the occurrence of meteorological disasters is more difficult to predict. Global climate anomalies have caused severe disasters in many countries. According to reports, the northern hemisphere has also been hit by strong cold waves and record-breaking snow in the past few days. From South Korea to Russia, from Western Europe to the Great Plains of the United States, they are all paralyzed by freezing temperatures and blizzards. In the past week, heavy rains have continued in the equatorial zone and the southern hemisphere, causing floods and mudslides in Kenya, Australia and Brazil, killing hundreds of people and leaving thousands homeless. The most alarming snowfall in northeastern Asia has plunged the region into the harshest winter in 60 years. After heavy snowfall in the Seoul area, the capital of South Korea, on the 4th, it was hit by a cold wave in the early morning of the 5th. The temperature dropped to -10°C, turning the snow in Seoul into ice and making the roads slippery, causing pain to office workers. Blizzards and avalanches also occurred on Sakhalin Island. More than 60 people, mostly homeless, froze to death in northern and eastern India. The government of the northern province in neighboring Nepal rushed to distribute blankets and firewood to help the poor cope with the cold wave. It is freezing cold in western Russia, while heavy snow falls in the Baltic Sea region and central and northern Europe. Poland is even more severely affected, with at least 13 people freezing to death, bringing the total to 122 people who have died from the severe cold since the beginning of winter. The weather in Western Europe has been extremely cold since the beginning of winter. Six countries have broken low temperature records in December 2009, and this cold weather will continue for at least another week. The UK recorded its coldest winter in 30 years on Monday, with temperatures reaching -12°C in some areas. The temperature in London rarely dropped to zero degrees. The media described that day as a "Black Monday" that only happens once in 30 years. The temperature in Germany will still hover around -20°C in the next few days, and there will continue to be snow. Austria has long been accustomed to "white" winters, but this year's temperatures dropped as low as -8°C at night and as low as -3°C during the day. Even native Austrians can't get used to it. Meteorological experts predict that Austria will continue to receive light snowfall in the next few days.

In the eastern United States, the temperature in North Dakota reached the lowest temperature in the United States at -46°C on the 4th. The temperatures in Jacksonville and Orlando, Florida, dropped to -6.7°C and -2.8°C, both setting new records. On the morning of the 5th, the weather was severely cold in most parts of the United States. According to forecasts, the weather in the relevant areas will not recover in the near future. The wind is biting in the Minnesota city of Minneapolis, with temperatures as low as -17°C. In addition to the upper Midwest, Florida, which is usually very "sunny", has also become very cold. The state government has advised people, tourists and farmers to take precautions against the cold. At least two people died in the severe cold weather in Canada, with up to 30 centimeters of snow on the east coast and temperatures in Toronto generally falling below -13°C. The cold wave is coming fiercely in the Northern Hemisphere, but heavy rains and flooding are occurring in the Southern Hemisphere. Affected by continuous heavy rains, the inland area of ??New South Wales, Australia, turned into a vast ocean, and hundreds of rural houses were flooded. In the town of Coonambool, 500 kilometers northwest of Sydney, more than 1,200 people evacuated their homes and were placed in temporary shelters on higher ground. The water level of a river flowing through the town once rose to 5.14 meters, approaching the highest record in 40 years. But water levels fell back on Monday. Heavy rains have continued in Brazil's Rio de Janeiro province since last week, causing flooding and landslides, killing 68 people and leaving dozens more missing. Two nuclear power plants may have to be shut down, and more than 4,000 people have been evacuated locally. The Kenya Red Cross said on the 4th that continuous heavy rains in Kenya over the past week have caused floods and mudslides, resulting in at least 20 deaths and about 30,000 people in urgent need of assistance. Causes of extreme weather Meteorological experts believe that recent extreme weather around the world is related to the La Ni?a phenomenon. "La Ni?a" means "holy lady" in Spanish. Contrary to El Ni?o, it refers to the large-scale continued abnormal cooling of the eastern and central equatorial Pacific Ocean, accompanied by global climate chaos. The World Meteorological Organization released a report in November 2007 saying that the La Ni?a phenomenon has formed and is likely to last until the first quarter of 2008, and the climate change trend in some areas may experience abnormal fluctuations. Although "La Ni?a" is called an "anti-El Ni?o" or "cold event", which manifests itself in large-scale low temperatures, rain, snow, and freezing disasters, the shadow of global warming can still be found behind it, which is a direct result of the increase in the earth's greenhouse effect. . At present, global warming is the biggest threat to the human living environment. Global warming is not simply environmental pollution and ecological disaster. It destroys the entire earth's climate system and triggers a series of chain reactions, with irreversible consequences. Statistics from the World Meteorological Organization also prove that almost 90% of natural disasters are related to climate events. Scientists believe that if global warming is allowed to continue to worsen, sea levels will rise significantly, leading to mass extinction of animals and plants, and millions of living beings falling into poverty. Academic research believes that carbon dioxide, carbon dust produced by the burning of coal, oil, and natural gas, and methane produced by the accumulation of garbage are the main causes of global warming. On the other hand, the indiscriminate deforestation and the expropriation of large amounts of farmland to build cities and factories have reduced the conditions for converting carbon dioxide into organic matter. In addition, the surface waters have gradually shrunk and precipitation has been greatly reduced, which has reduced the conditions for absorbing dissolved carbon dioxide and destroyed the environment. The dynamic balance of carbon dioxide generation and conversion causes the carbon dioxide content in the atmosphere to increase year by year. Therefore, climate warming essentially stems from human activities and is nature’s revenge on mankind’s crazy demands.