The weather in Orlando in October

Global warming is a word that people often hear. However, in recent days, many countries in Europe, America and Asia have experienced extreme weather such as snowstorms and heavy rains. Beijing suffered the biggest snowstorm in the same period in 60 years, and the temperature hit record lows. Didn't the Copenhagen conference last year always discuss global warming? Why is the climate so cold? With the appearance of extreme weather, the topic of climate change continues to be the focus of world attention. The continuous heavy snowfall in the north has set a record for the same period in history. The first heavy snow on 20 10 was not unexpected. As early as a few days ago, the Beijing Meteorological Observatory made a forecast that there would be snow at 10 on October 3. 654381October 2, the forecast was changed to heavy snow. 65438+1At 3: 20 am on October 3, Beijing Meteorological Observatory issued a blue warning of blizzard; At 8: 50, the meteorological department upgraded the blue warning signal of blizzard to a yellow warning signal. It is reported that this is the first time that Beijing has issued such a high-level blizzard warning since the winter of 2009. According to meteorologists, the snowfall in Beijing and Tianjin on1October 3 exceeded the historical extreme value of 195 1 since 65438+1October. Sun Jun, chief forecaster of the Central Meteorological Observatory, said in an interview that the heavy snow in Beijing, Tianjin and Hebei was mainly caused by a strong cold air coming south from the Mongolian Plateau, while the water vapor conditions in North China were sufficient. When cold air comes down, water vapor rises, bringing precipitation. "Because the temperature in North China is relatively low, the precipitation is mainly snowfall." The snowfall in many places in northern China this winter is particularly early and heavy, which is not only the feeling of ordinary people, but also scientifically confirmed. Dr. Xiao, deputy director of the Climate Application and Service Office of the National Climate Center, told the reporter that the heavy snow in Beijing, Hebei, Shanxi, Henan and other places generally showed two characteristics: First, it came early. Taking Beijing as an example, the average time of the first snow in that year was 1 1 at the end of the year, but this time it was almost one month earlier, setting a record for 22 years. Secondly, the intensity is high, and the snowfall in the snowfall area reaches the level of once in 60 years, and some areas break through once in a hundred years. It is reported that the snowfall in China is closely related to the recent atmospheric circulation characteristics. From June 5438 to October 2009 10, there were frequent cold air activities in high latitudes in the northern hemisphere, which led to strong cooling and rainy and snowy weather in North America and Europe. Since the end of June, 2009, 5438+ 10, cold air has moved eastward and southward, affecting the north of China. At this time, the easterly air flow in the Pacific Ocean [11.67-1.85%] is strong, which transports a lot of water vapor to the inland, while the high-pressure air flow in the south is weak, unable to stop the water vapor from going north. In this case, the convergence of cold and warm air formed a good dynamic condition, resulting in a wide range of heavy snowfall. Although the first snowfall in many parts of the northern hemisphere this year is ahead of schedule, it gives people a feeling of "cold", but it is not contradictory to the trend of global warming. Experts said that although the current trend of climate change is global warming and high temperature, the weather changes will fluctuate and will not develop steadily. In a certain period of time, there will be extremely cold weather. Because climate warming will lead to a large amount of seawater evaporation, and the water vapor in the atmosphere will increase, and a large amount of water vapor will turn into blizzard when it meets the cold current, so global warming can actually lead to frequent 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, cold air activities have indeed weakened on the whole, and cold weather events have generally decreased, but it is not excluded that occasionally strong cold air and snowstorms will suddenly appear. Under the background of climate warming, the air in the lower layer is obviously warming, the atmospheric instability is increasing, and the strong convective weather is increasing. Great changes have taken place in the probability, time, scope and region of extreme meteorological disasters that occur once in a hundred years or once in several decades, and the occurrence of meteorological disasters is more difficult to predict. Global climate anomalies have brought serious disasters to many countries. It is reported that the northern hemisphere has also been hit by strong cold current and record heavy snow recently. From south Korea to Russia, from western Europe to the great plains of the United States, they were paralyzed by cold and snowstorms. In the equatorial region and the southern hemisphere, heavy rains continued in the past week, causing floods and mudslides in Kenya, Australia and Brazil, killing hundreds of people and leaving thousands homeless. The snow in Northeast Asia is the most amazing, which plunged this region into the harshest winter in 60 years. After the heavy snow in Seoul, the capital of South Korea, on the 4th, it was hit by a cold current in the early morning of the 5th, and the temperature dropped to-10℃, which turned the snow in Seoul into ice and made the roads for office workers slippery. There are also blizzards and avalanches on Sakhalin Island. In northern and eastern India, more than 60 people froze to death, mostly homeless vagrants. The government of the northern province near Nepal urgently distributed blankets and firewood to help the poor cope with the cold current. It's freezing in western Russia, and it's snowing in the Baltic Sea and Central and Northern Europe. The disaster in Poland is even more serious, with at least 13 people freezing to death, making 122 people have died of extreme cold since winter. The weather in western Europe has been very cold since winter. Six countries broke the record of low temperature from June 5438 to February 2009, and this extremely cold weather will last for at least another week. On Monday, Britain recorded the coldest winter in 30 years. In some areas, the temperature reached-12℃, and the temperature in London rarely dropped to zero. The media described that day as "Black Monday" once in 30 years. In the next few days, the temperature in Germany will still hover around -20℃, and there will be continuous snowfall. Austria has long been used to the "white" winter, but this year's temperature has dropped to -8℃ at night and -3℃ during the day, which even native Austrians can't adapt to. Meteorologists predict that there will be light snow in Austria in the coming days. In the eastern United States, the temperature in North Dakota reached the lowest temperature of -46℃ in the United States on the 4th. The temperatures in Jacksonville and Orlando, Florida dropped to -6.7℃ and -2.8℃, both setting new records. On the morning of the 5 th, the weather in most parts of the United States was extremely cold. According to the forecast, the relevant areas will not pick up in the near future. Minneapolis, Minnesota, is bitterly cold, and the temperature is as low as-17℃. In addition to the upper midwest, Florida, which is usually sunny, has also become chilly. The state government advises people, tourists and farmers to do a good job of cold protection and warmth. In Canada, at least two people died in cold weather. The snow on the east coast is as high as 30 cm, and the temperature in Toronto is generally lower than-13℃. The cold current in the northern hemisphere is threatening, but in the southern hemisphere, there are heavy rains and floods. The inland area of New South Wales has been affected by torrential rains for several days, turning it into a Wang Yang, and hundreds of rural houses have been flooded. In the town of Kunanbul, 500 kilometers northwest of Sydney, more than 1200 people were evacuated from their homes and placed in temporary shelters on higher ground. The water level of a river flowing through the town once rose to 5. 14 meters, which was close to the highest level in 40 years, but it fell back on Monday. Since last week, heavy rains in Rio de Janeiro, Brazil have caused floods and landslides, resulting in 68 deaths and dozens missing. Two nuclear power plants may have to be shut down and more than 4000 people have been evacuated. The Kenyan Red Cross Society said on the 4th that heavy rains in Kenya in the past week triggered floods and mudslides, which killed at least 20 people and left about 30,000 people in urgent need of assistance. Meteorologists believe that the recent extreme weather around the world is related to La Nina. La Nina means "saint" in Spanish. Contrary to El Nino, it refers to the continuous abnormal cooling of seawater in the eastern and central equatorial Pacific Ocean, accompanied by global climate chaos. According to the report released by the World Meteorological Organization on June 5438+065438+ 10, 2007, La Nina phenomenon has formed and may last until the first quarter of 2008, and the climate change trend in some areas may fluctuate abnormally. Although "La Nina" is called "anti-El Nino" or "cold event", it shows a wide range of low temperature, rain, snow and freezing disasters, but the shadow of global warming can still be found behind it, which is the direct result of the increase of global greenhouse effect. At present, global warming is the biggest threat to human living environment. Global warming is not a simple environmental pollution and ecological disaster. It destroys the climate system of the whole earth and will trigger 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 continues to worsen, the sea level will rise sharply, leading to a large number of extinction of plants and animals, and millions of people will fall into poverty. According to academic research, carbon dioxide, carbon dust and methane produced by the combustion of coal, oil and natural gas are the main reasons for global warming. On the other hand, deforestation, a large number of farmland has been requisitioned to build cities and factories, reducing the conditions for carbon dioxide to be converted into organic matter; In addition, the surface water area is gradually shrinking, and the precipitation is greatly reduced, which reduces the conditions for absorbing and dissolving carbon dioxide, destroys the dynamic balance of carbon dioxide generation and transformation, and makes the carbon dioxide content in the atmosphere increase year by year. Therefore, climate warming essentially stems from human activities and is the revenge of nature on human madness.