There are many reasons why the maximum temperature difference between the northern hemisphere and the southern hemisphere exceeds 90℃.

The global climate problem is becoming more and more serious. There is a great temperature difference between the northern and southern hemispheres. Some places are in winter and some places are in summer. Recently, the earth began a crazy mode, and the highest temperature difference between the northern and southern hemispheres exceeded 90℃. Then the following constellation knowledge reveals the reason for the large temperature difference. The earth started a crazy mode, and the temperature difference between the northern and southern hemispheres was 90℃. Local time 19, Yakutsk, Russia suffered from severe cold weather. The lowest temperature in this city reached MINUS 46 degrees Celsius. In Australia, which has been swept by the heat wave for a week, many mountain fires continue to ravage, and Adelaide has set a high temperature record of 45.3℃. There are many reasons why the maximum temperature difference between the northern and southern hemispheres of the earth exceeds 90℃. The World Meteorological Organization believes that behind extreme weather events, it represents a trend feature of climate-global warming. Scientific research has confirmed that global warming caused by the increase of atmospheric greenhouse gas concentration caused by human activities can change the frequency, intensity, spatial range and duration of extreme weather events, and may lead to unprecedented extreme events. The latest research results show that the frequency of extreme weather events will increase significantly when the average climate state changes. If the average temperature moves in the warm direction, the extremely cold weather will decrease and the frequency of extremely warm events will increase significantly, and vice versa. In addition, climate change will also change the large-scale circulation pattern, air-sea interaction, ground-air interaction, etc., and then affect the occurrence of extreme weather and climate events in different regions. Take the El Nino phenomenon in the equatorial Pacific as an example. Global warming will enhance the air-sea exchange, and the ocean will also absorb the increased greenhouse gases in the atmosphere, which will lead to the warming of seawater, and the extreme events and disasters caused by El Ni? o will increase accordingly, such as floods in southeastern South America and western North America, and droughts in India and Australia. In the northern hemisphere, the temperature in the southern Arctic Ocean (inhabited by about 4 million people) has increased by 1 to 3 degrees Celsius in the past 50 years. Some permafrost zones in Canada, Alaska and Russia have begun to melt, which may destroy the ecosystem in this area. The increase of bacterial activity in soil will lead to the change from carbon sink to carbon release source in this area. A study on eastern Siberia (published in Science) shows that its southern part is gradually disappearing, resulting in the disappearance of nearly 1 1000 lakes in the past 197 1 year, that is1/kloc-0. At the same time, West Siberia is in the initial stage of its permafrost melting, which is creating new lakes. At the same time, a large amount of methane (an additional greenhouse gas) may be released into the atmosphere. At the same time, global warming has also led to the accelerated melting of Arctic sea ice. In recent 30 years, the minimum coverage area of sea ice in summer has been reduced by half, and its direct consequence is that the atmospheric circulation in the northern hemisphere in winter has been changed by affecting the Siberian high, which has led to a significant increase in the frequency of extreme low temperature events in the middle and high latitudes of Eurasia. In recent years, extreme weather and climate events related to global warming have become increasingly frequent, which has brought many adverse effects on social economy, ecological environment and human health. According to authoritative statistics, from 1980 to 20 13, there were 22,000 natural disasters in the world, resulting in economic losses of about 3.8 trillion US dollars. About 87% of natural disasters and more than 70% of economic losses are directly related to climatic disasters or meteorological conditions such as drought, flood, tropical cyclone, high-temperature heat wave and low-temperature chilling injury. In the final analysis, whether people freeze to death or die of heat is closely related to global warming. If human beings are not committed to curbing the trend of climate change, by the end of 2 1, the probability of high-temperature heat wave events in land areas will be 5- 10 times that of now; The global extreme low temperature events will decrease on average; In most parts of the world, the frequency of extreme precipitation events will increase.