202 1 what are the reasons for the abnormal weather?

202 1 The weather is abnormal for two reasons:

First, extreme weather events have increased.

The second is: weather year deviation and frequent extreme weather.

In 20021year, except for the strongest sandstorm in most parts of China, typhoons in southern Jiangsu caused more than a dozen deaths and snowfall in many places. Worldwide, Houston, Texas, USA was hit by a snowstorm, millions of users were blacked out, Kenya, Africa was hit by locusts, and a volcano erupted in Europe for several months. The global climate seems abnormal.

This year's abnormal temperature is, in the final analysis, caused by global temperature rise, sea level rise, global warming, obvious "greenhouse effect" and abnormal climate.

Mainly manifested in two aspects: on the one hand: the emergence of La Nina phenomenon. When La Nina occurs, the meridional circulation in the middle and high latitudes of Europe and Asia is relatively large, and the cold air activity is also strong, so the temperature in most parts of central and eastern China is easy to be low.

On the other hand, there is less sea ice in the Arctic and a strong winter wind in East Asia. The lack of Arctic sea ice is beneficial to the strong ridge of Ural Mountain in winter, and the winter wind in East Asia is strong, so the temperature in most parts of central and eastern China is easy to be lower than normal.