Why is the weather so extreme this year?

The extreme weather this year (20 19-2020) is mainly caused by the influence of global warming.

When the global average temperature rises 1℃, great changes will take place: sea level rises, glaciers in mountainous areas shrink, and the snow area shrinks. As the global temperature rises, it will lead to unbalanced precipitation, with precipitation increasing in some areas and decreasing in some areas.

Global warming has increased precipitation in Chinese mainland, especially in the middle and high latitudes, and reduced precipitation in some areas such as Africa. Frequency and intensity of extreme weather and climate events (drought, flood, thunderstorm, hail, rainstorm, high temperature weather and sandstorm, etc.). ) has increased in some areas. El Nino and La Nina will also occur frequently.

Extended data

Take drought and flood as an example. After climate warming, the temperature of land and ocean surface will rise, and evaporation and transpiration will occur more easily. The water vapor content in the atmosphere will increase, and the water that can be contained will also increase. This means that more water vapor is needed to achieve precipitation conditions.

When the atmosphere is not saturated, it will continuously absorb water, making the land drier and forming drought. Once the atmosphere is saturated, it is easy to form heavy precipitation due to the increase of atmospheric water content, which may lead to floods. In addition, due to the strengthening of heat and water vapor exchange between the northern and southern hemispheres, the climate is more likely to become abnormal.

Under the background of global warming, the climate in China has also changed obviously in the last hundred years. In recent hundred years, the annual average temperature in China has increased by 0.5℃ ~ 0.8℃. The trend of climate warming in China will be further intensified in the future. It is predicted that the annual average temperature in China may increase by 0.5℃ ~ 0.7℃ in 2020 and 1.2℃~ 2.0℃ in 2050.

In the next 50 years, the average annual precipitation in China will increase. It is predicted that the annual average precipitation in China will increase by 2% ~ 3% by 2020, and may increase by 5% ~ 7% by 2050.

China Political Consultative Conference News Network-Why are there more and more extreme weather?

Baidu encyclopedia-global warming