Why is it getting cold 25 and why is it getting colder

The Earth's orbit around the Sun is elliptical, which determines that their distance varies regularly, the farther away it is, the colder it is, and the closer it is, the warmer it is.

The cycle is decided. Around March 5 of the Gregorian calendar, it is a sting. Qingming - including sunny weather, fresh and clear air, gradually warming, lush vegetation.

Around December 7th. Small cold, big cold - the weather is getting colder further, the small cold has not yet reached the coldest time, and the big cold is the coldest time of the year.

Although there is no solar term in foreign countries, the changes in cold and warm are similar to those in China. Because we are all on the same planet.

The Earth's orbit around the Sun is an ellipse, not a circle, so when the Earth revolves around the Sun (a year), there will be times when it is closest to the Sun, and there will be times when it is farthest from the Sun, the closest is summer, and the farthest is winter.

Because of the rotation of the earth, there are apogee and perigee, and the earth's axis of rotation is affected, and the sunshine will move.

Because the sun shines directly on the southern hemisphere, the solar radiation in the northern hemisphere is weak, and the further north you go, the colder it gets.

The angle of sunlight is different.

In winter, the angle of incidence is smaller.

In summer, the angle of incidence is large.

The amount of energy entering can be several times, or even more than a dozen times worse.

Because in winter, the sun is obliquely on the earth, and the distance is relatively far, so the weather is cold.

The weather gets colder because the seasons are changing, and the reason why it's cold in winter is because the sun hits the southern hemisphere directly, and the solar radiation in the northern hemisphere is weak, and the farther north it goes, the colder it gets.

Because the sun is tired, the weather becomes colder.

See this reference.

9k - The Earth's orbit around the Sun is an ellipse, not a circle, so when the Earth revolves around the Sun (a year), there will be times when it is closest to the Sun, and there will be times when it is farthest from the Sun, the closest is summer, and the farthest is winter.

Solar radiation. When the Northern Hemisphere is cold, the Southern Hemisphere is hot.

When the Southern Hemisphere is cold, the Northern Hemisphere is hot.

The seasons in the northern and southern hemispheres are reversed.

Because the sun is not happy!

Haha, what? Hahahaha

The first reason is that we are in a La Niña state this year, that is, the sea surface temperature in the eastern equatorial Pacific is lower than normal and below the negative degree, and the impact of this phenomenon on China's climate is very obvious. It's going to have a cold winter, so we can see that this cold winter is coming this year. The second reason is that the two conditions that must be met for snow or rain are 1

Warm and humid air currents from the tropics. 2.There is cold air from the alpine regions.

Areas of winter snowfall (the same is true for areas of summer rainfall) are located near fronts, i.e. at the junction of warm and cold air masses. This position is not fixed, it is determined by the strength of the forces of the two natures. The cold air mass is weak, and the front and precipitation area are higher latitudes, and the cold air mass is stronger, and the front and precipitation areas are lower latitudes.

The land cold high that affects China in winter is the Asian high (also known as the Mongolian and Siberian high pressure) centered in Mongolia and Siberia, and its sphere of influence is very large, which has a great impact on the weather in China, especially in the northern region. The cold air that affected our country in the early part of midwinter this year is relatively weak, and the number of times is not much, even with the cooperation of warm and humid airflow, it is not easy to snow without cold air. However, since 2008, the Asian high pressure is very active, and the cold air mass continues to form southward to affect our country, resulting in a wide range of windy cooling weather, but because the warm air mass in the south this year is also very active, a large number of warm and humid air currents from the Pacific Ocean and the Indian Ocean frequently visit the southern region, when the strong cold air mass from Siberia, Mongolia quickly moves south to the southern region, and meets with the warm and humid air mass, the cold, warm two just combined.

Affected by the combination of these two airflows, there has been a lot of rain and snow in recent times, especially in the Yangtze River basin, and the weather has been maintained at low temperatures for a long time. If there is only a strong cold air mass, and there is no large amount of water vapor provided by the warm and humid air mass, there will only be strong winds and cooling weather in the south; If there is only a large amount of water vapor provided by the warm and humid air mass, and no cold air mass is present, there is no catastrophic weather at all. And when both are in place, disaster strikes.

The change in temperature is mainly affected by the height of the sun at noon and the length of day and night. The change of winter and summer is caused by the existence of the yellow-red intersection angle, and the change of the two elements at different times during the earth's revolution. Different latitudes, even in the same hemisphere, with different heights of the sun at the same time, the temperature is of course different.

However, in winter, the temperature in China is much lower than that of Western Europe at the same latitude, mainly due to: 1. The difference between sea and land. The temperature difference between winter and summer is low in the ocean due to the slow heat absorption and heat release.

2. Siberia, which is covered by ice and snow (reflecting sunlight and reducing ground absorption), forms an extremely low temperature zone, and the "cold air" blown by it seriously affects the winter temperature in China. We can see that the temperature has warmed up after the cold air.