Why is it always raining recently?

Due to global warming, the atmosphere, ocean and the whole earth system are becoming more and more unstable. In recent decades, we have witnessed the rise of global temperature. Especially in the Arctic and mid-latitudes. In 20 19 years, the temperature reaches the highest value again and again every month, and global warming is coming.

The occurrence of extreme cold events seems to have little conflict with the cold wave. In this regard, Wang Zunya explained that the reduction of the cold wave does not mean that it will not happen. As long as the cold wave comes, it will bring severe cooling, accompanied by low temperature, strong wind, rain and snow. The change of cold wave intensity and frequency will be influenced by global climate background, circulation at different time and space scales and external forcing factors.

Some experts believe that under the background of global warming, the warming in different regions is uneven, and the warming in the Arctic region is greater than that in the mid-latitude and low-latitude regions, which makes the temperature gradient between the low-latitude and high-latitude regions smaller, further promoting the meridional enhancement of the circulation in the mid-latitude region of Europe and Asia, thus making it easier for cold air to erupt to the mid-latitude region.

Some scholars also say that global warming has accelerated the melting of Arctic sea ice. Once the polar ocean lacks ice sheets, the relatively warm air on its sea surface will move to the cold high altitude, thus affecting the polar atmospheric circulation. As a result, the polar cold air, driven by the high-pressure system, moved southward to the northern hemisphere continent, resulting in a sudden drop in temperature.

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In the case of continuous low temperature and freezing weather, people's doubts about global warming are always one after another. Ding, an academician of China Academy of Engineering, said that global warming is an average trend. If we only look at the warming effect of greenhouse gases, the speed of global warming will increase in the future, but there are still uncertainties.

In fact, the relationship between global warming and the change of cold wave frequency and intensity is very complicated. At present, the scientific community has realized the importance of this relatively short-scale climate change prediction in the next 20 to 30 years, and it will take several years to clearly answer the detailed and credible evolution track of recent global climate change.