Extreme weather is feared this winter, and the annual probability of La Nina is 87%. Why is this phenomenon formed?

The climate change in 221 will usher in a more serious change, that is, the so-called extreme weather will become more and more complicated. Meteorologists have made an early prediction on the weather this year, and the probability of cold winter this year is extremely high, and the main reason behind this is the La Niñ a effect. So what is La Niñ a phenomenon? ?

1. Is it likely to be extremely cold this winter?

The probability of extreme weather in p>221 is extremely high. This summer, there was continuous high temperature in North America, and heavy precipitation occurred in Henan, China. Focusing on the extreme high temperature weather in southern China in recent October, we felt that the extreme weather this year was more than before. Experts predict that this winter will usher in more extreme cold weather, which is caused by global warming. ?

second, la Nina phenomenon?

The most direct manifestation of La Nina phenomenon is that the seawater temperature in the eastern equatorial Pacific Ocean is abnormally low, which affects the atmospheric circulation, and the seawater temperature will affect the upper atmospheric flow speed. Due to the low radiant heat of seawater, the atmospheric density and pressure above it will become higher, thus becoming drier. The opposite will happen over the sea with high temperature. Under the pressure gradient change of the north-south air mass, heavy and dry air will sink southward, while the high-pressure air mass in the eastern Pacific will drive water vapor and be forced to land in Indonesia, which directly leads to the continuous increase of precipitation in Indonesia. ?

experts predict that this year's La Nina effect will last from November this year to 222. La Nina squeezes the subtropical high position, and then cold air will continue to form a group to the south, which will lead to the continuous cooling in the southern region after October this year. It is expected that La Nina will return to the earth this winter, with an annual probability of about 87%, leading to extremely cold or heavy snowfall this winter. For us, it is still necessary to do the relevant protective work to avoid being affected by extremely cold weather.