Why is the weather so abnormal now, and it s still very cold?

With the United Nations Copenhagen Climate Change Conference, "climate warming" has become a hot topic. However, after the conclusion of this meeting, Europe and the United States were hit by extreme snowstorms. Now, there is also rare heavy snowfall in Beijing, Tianjin and other places in China.

Some people have questions: doesn't it say that the global climate is warming, why is the weather so cold?

On this issue, Sun Jun pointed out that in the context of global warming, there are often more extreme weather, "These extreme weather, including high temperatures and heat waves, as well as cold waves with extremely low temperatures, and heavy snowfalls. The general trend of climate change is that the world is warmer and warmer, but at a certain time, there will be extremely cold weather."

He stressed that climate warming is a general trend, but weather changes will fluctuate and will not develop steadily.

Global warming is a fact, as is the frequency of extreme weather.

It also shows that the climate is gradually deteriorating.

Cold air activity on Earth is the direct cause of cooler weather.

At the same time, because the Earth revolves around the Sun, these parts of the Northern Hemisphere become cooler when the direct point of the Sun moves south. Also in the southern hemisphere of the Earth, these places in the southern hemisphere become cooler when the direct point of the sun moves north. It is not the reason why the Earth's revolution turns to perihelion and aphelion.

The Eurasian continent in the Northern Hemisphere is greatly affected by the warm westerly winds of the North Atlantic in winter, and when the warm westerly winds of the North Atlantic are stable, they can block the cold air from the polar regions from moving southward, thereby weakening the cold wave. But this year's La Niña event has upset the stability of the warm westerly winds in the North Atlantic.

La Niña is a phenomenon in which the southeast trade wind blows away the hot sea water near the equator, causing the lower cold sea water to turn up, and the air pressure to become higher, making the subtropical high pressure in the northern hemisphere stronger, blocking the warm westerly wind from the North Atlantic Ocean to the Eurasian continent, so as to facilitate the continuous southward movement of cold air from the polar regions.

This must have something to do with the air.

Because the sun is in the southern hemisphere.

Why is it cold in winter and hot in summer? Some people may think that we are far away from the sun in winter, and the opposite in summer, but in fact, this idea is completely wrong, the earth revolves around the sun is an ellipse close to a perfect circle, the closest date to the earth is in early January, and the farthest distance is in early July, that is to say, it is precisely when we are closest to the earth that it is the coldest season in the northern hemisphere, which also shows that in the process of the earth orbiting the sun, the distance of the earth from the sun is not a factor that determines the temperature or cold. The correct explanation is this:

The four seasons are formed mainly because the equator and the ecliptic (the path through which the sun travels as seen on Earth) are obliquely intersected. When the Earth moves, the direction of its axis in space does not change. In winter, the sun's rays are obliquely on the ground, and the heating per unit area on the ground is less, and the days are short, and the daily sunlight is short, that is, the heating time is short, and then because of the atmosphere around the earth, it absorbs a part of the light and heat, and when the light is irradiated, the thicker the atmosphere, the more it absorbs, so it causes cold in winter.

In summer, on the other hand, the sun hits the ground directly, the days are long, and the light passes through the atmosphere and is thin, so the climate is hot. The spring and autumn rainy seasons are between winter and summer, so the climate is mild. It is because in winter, the height angle of the sun is smaller, the sunlight is obliquely shining on the earth, the energy density of the sun reaching the earth is smaller, and the earth gets less energy from the sun, so the winter is cold; And in summer, the height angle of the sun is large, the sunlight is almost direct to the earth, the energy density of the sun reaching the earth is very large, and the earth gets more energy from the sun, so the summer is hot.

Because the Earth's orbit around the Sun is an ellipse, in winter, our Earth is closer to the Sun; In the summer, our earth is far from the sun.