What does La Nina mean?

What does La Nina mean? Just a few days ago, Chinese and American experts voiced at the same time, saying that the probability of extreme weather this winter will be great. Both Chinese and American experts have said that La Nina is back, so what does La Nina mean?

What is the meaning of La Nina phenomenon? 1 I believe everyone has found that this year's winter came suddenly. One day I was wearing a sweater, and the next day I was going to put on a cotton-padded jacket. In this regard, the National Climate Center explained that this is a manifestation of the "La Nina state" and there will be another La Nina event this winter. What is La Nina? How is it formed? What impact will it have on the climate?

What is La Nina phenomenon?

First, we circle something useful: La Nina. La Nina means "little girl" in Spanish, and La Nina phenomenon refers to the abnormal cooling of seawater in the central and eastern Pacific Ocean.

The southeast wind blows the seawater heated by the sun to the western Pacific Ocean, causing the sea level in the west to rise by nearly 60 cm compared with that in the east. Then, when the sea water temperature in the west rises, the air pressure will drop, and the humid air will accumulate to form typhoons and tropical storms, and the sea water in the eastern Pacific will become cold.

Under normal circumstances, La Nina always appears after El Ni? o, and its appearance often causes a cold wave from the polar regions in temperate regions.

Many people may not know that La Nina just ended in March of 20021,so if La Nina happens again after winter, it is called "La Nina with two peaks".

How is La Nina phenomenon formed?

Every time La Nina phenomenon appears, it will bring disaster to many parts of the world. So, how did La Nina come into being?

In fact, La Nina is related to the decrease of seawater temperature and the enhancement of trade winds in the equatorial Middle East Pacific, so La Nina is the product of the interaction between tropical ocean and atmosphere.

Among them, the trade wind refers to the wind blowing from the tropical region to the later region at low altitude, which is called "Northeast Trade Wind" in the northern hemisphere and "Southeast Trade Wind" in the southern hemisphere.

Didn't you say global warming? Why is there extremely cold weather?

Seeing this, many friends may be confused. Obviously, the biggest problem we are facing now is global warming. Why is there extremely cold weather under such an environmental background?

In fact, the two are not contradictory. Even if global warming causes the temperature to rise, it doesn't mean that winter is no longer cold. Due to the influence of the cold wave going south, many places will still be very cold in winter.

In addition, global warming will melt the glaciers in the north and south poles, which will lead to the decrease of the meridional temperature gradient from the equator to the polar regions, which will lead to the instability of the westerlies, the weakening of the polar vortex, and the cold air in the polar regions will break free and frequently go south, resulting in extremely cold weather.

Why are farmers optimistic about the arrival of La Nina phenomenon?

But the appearance of La Nina phenomenon is really good for farmers, because the appearance of La Nina will not only cool down, but also bring snowfall and even freezing rain, which is good for agricultural development.

There is an old saying among farmers that "winter is full of snow." The abundant blood brought by La Nina can freeze pests in cultivated land to death, and the melting of snow also adds moisture to the earth, so farmers will be very optimistic.

What is the meaning of La Nina phenomenon? 202 1 is a very unusual year, with extreme weather coming one after another, which has seriously affected many countries and regions.

What makes everyone feel the same is that this autumn was directly skipped, and just a few days ago, experts from China and the United States voiced at the same time that there would be a high probability of extreme weather this winter.

Chinese and American experts all say that La Nina will return, how to spend the winter?

I believe many people also felt the unusual weather this year, first high temperature, then typhoon and rainstorm, and then the temperature plummeted. Maybe you were still playing with your vest on the first day of National Day, and you quickly put on your long pants the next day.

This "one-night cold winter" mode makes netizens unbearable. Now that experts in China and the United States have basically confirmed that La Nina will make a comeback, how can we spend this winter?

Let's take a look at the upcoming double-peak La Nina phenomenon. After the La Ni? a phenomenon from August last year to March this year, this winter, La Ni? a phenomenon will have a high probability of making a comeback. Ten days ago, on NOAA's ENSO page, a digital message that should have been updated on September 9th-10 of each month was updated in advance.

This figure means that the probability of La Nina's return has been gradually updated from 70% to 80% in September to 87%. This percentage is very accurate and there is no ambiguity.

And for the United States, La Nina can be simply called drought in the west and snowfall in the east, which will bring climatic floods and extreme drought to the United States. To sum up, it means that heavy snow is accompanied by fire, and American meteorologists also say that the phenomenon brought by La Nina effect will gradually appear in a few days.

654381October 20th, at the executive meeting held in the State Council, China, there was a meeting item specially prepared for meteorologists' prediction. As meteorologists predict that there will be extreme weather this winter, the temperature may be lower than that in the same year.

Therefore, the meeting decided to provide heating measures to the north, especially the northeast region, fully guarantee the production and transportation of coal in the north, and organize the "South-to-North Gas Transfer Project" to ensure that the losses in the north are minimized under the influence of extreme weather.

As early as 10 and 15, the Central Meteorological Observatory has issued a cold wave warning, and it will gradually escalate into a large-scale cold wave weather.

You know, the power of the super cold wave in 2020 is terrible. Take the United States as an example, this cold wave weather is the lowest temperature recorded in recent 30 years, and this cold wave has also caused extremely serious impact.

This super cold wave caused serious losses to almost 4.5 million families in the United States, and most of the affected areas were cut off from electricity and water. Because the temperature is too low, water pipes in many areas directly freeze and crack, causing serious losses to their property and lives.

For La Nina, who is about to return this year, the cold air activity in northern China will be more frequent and stronger than in previous years. In the south, water vapor conditions may be poor, which is not conducive to the formation of precipitation.

Some meteorologists also said that the La Ni? a phenomenon that returns in a short time should be a weak La Ni? a phenomenon, and the extreme climate will not be too strong. Moreover, it should be noted that the lower temperature than normal does not mean that it is cold in winter, and the specific situation in winter needs further decision.