What is the reason for the cold weather in 2022?
1, the impact of La Nina event
At the end of 20021and 10, the National Climate Center announced that China 10 entered La Nina state. And this winter will form a weak to moderate intensity La Nina event, such as the low temperature freezing weather in June+10 in 5438, which is caused by La Nina and has a serious impact on the ice disaster in southern China. In February, 2022, it was said that it was affected by La Nina.
2. The south is rich in water vapor.
The trough of low pressure in the southern branch of the Qinghai-Tibet Plateau is active, and the strong southwest airflow in front of the trough transports a large amount of ocean water vapor to the south of China and climbs up along the cold air cushion. The constant confrontation and convergence of cold and warm air currents have resulted in repeated cooling and snowfall.
3. Cold air invades the south
Meteorologists said that since February, due to the strong Siberian high, the atmospheric circulation in East Asia is dominated by meridional characteristics, which is conducive to the repeated invasion of cold air into China. With the strong Indo-Myanmar trough and good water vapor conditions in the lower layer, low-temperature rain and snow weather appeared in the south in February.
There was an extreme cold wave in January and February.
In the first ten days of 20021,1,that is, just in the winter, experts from the National Meteorological Administration warned everyone that "cold air activities will obviously intensify in most parts of central and eastern China in February, and there will be staged extreme cold wave events". Because the weather was not cold in 1 1 month and 1 February last year, by the end of1month, cold air began to move frequently, affecting many areas in Central China.
5. Global warming
Under the background of global warming, the frequency and intensity of extreme weather such as high temperature heat wave, drought, flood, typhoon and cold wave will increase. Because global warming has changed the meridional scale characteristics of atmospheric circulation, and affected the local climate through air-sea and ground-air interactions.