There are more and more extreme weather. After a few years, the four seasons cycle will disappear, leaving only summer?

No matter how many extreme weather there are, the four seasons in human history will never disappear, let alone just summer.

Extreme weather: Extreme weather may make summer hotter or colder, and extreme changes in rainfall will lead to droughts and floods. For example, this year, the hot weather in the south lasted for 67 days, and there was a drought in Europe once in 500 years, which is rare in history. In 2020, there were five numbered flood peaks in the Yangtze River flood. Are these all summer poles? Although the weather is extreme, it happens in summer, but it doesn't happen in other seasons, and it doesn't affect the cycle of the four seasons. It's just climate fluctuation. Summer won't last long.

In some years, due to the abnormal atmospheric circulation, the subtropical high extending westward, and the La Nina phenomenon in the eastern Pacific, the summer becomes longer, but it is not particularly extreme. For example, the average number of days in summer is 93 days, which may reach 100 days this year, but it has only been extended by about 7 days, or even longer than 10 days. Summer is coming to an end and we have to go eventually. Because the direct point of the sun will return to the southern hemisphere after summer, which does not support the continuation of the heat in the northern hemisphere, then the subtropical high will also collapse and the cool autumn will come soon.

Will summer really disappear after thousands of years? Thousands of years is a long time in human history, but it is only a blink of an eye in the history of earth development.

If summer disappears after thousands of years, unless the intersection angle between the ecliptic and the equator is reduced to 0 degrees, the height of the sun will not change, and the four seasons are really not reincarnation. There is also the possibility of large-scale mountain building. Is it possible?

Let's talk about the change of ecliptic angle first. This angle is not fixed, but changes slowly. This is due to the precession and nutation of the earth's rotation axis and the comprehensive influence of other planets on the earth's orbit, which leads to the westward movement of vernal equinox. The declination angle varies from 22 00 ′ to 24 30 ′, and the change period is about 4 1000 years. The last minimum crossing angle between yellow and red was about 28,000 years ago. The declination angle decreases at a rate of about 46.84″ per century, and the declination angle is 23 26 ′15.3308 ″ at 20 13 12 on October 0 (20 13.0).

The declination angle varies from 22 00' to 24 30', so it is impossible to produce 0 degree, so the four seasons will not disappear. The change period is about 4 1000 years, which is slower than the history of thousands of years. So after thousands of years, there will be some subtle changes in the four seasons, but the four seasons will still exist.

As we all know, there was a large-scale orogeny around the Pacific Ocean more than 200 million years ago, which led to great changes in the climate. At that time, the earth's surface was wet, the summer was long without winter, the climate was hot, the vegetation was lush, and dinosaurs were born accordingly. The largest dinosaur weighed more than 60 tons and became the overlord on the earth. Cenozoic, Himalayan orogeny 200-300 million years ago, Qinghai-Tibet Plateau uplift, human birth.

The last Pacific Rim movement was about 200 million years since Himalayan orogeny. According to this cycle, millions of years have just passed, and the earth is in a stable period for hundreds of millions of years. The upwind system on the earth will not change much, and the climate will stabilize. After thousands of years, winter will not disappear, but summer will still exist. Of course, with the emergence of large-scale orogeny, human beings may evolve into a more advanced life phenomenon, not just the problem that the four seasons will not rotate, but the problem of another day.