What caused the rare "blue sun" in Beijing?

On April 2 1 day, with the large-scale "dusty weather" in northern China, an extremely rare "blue day" appeared in the sky in Beijing.

You know, on the earth, the sun that normal people see with the naked eye is actually yellow and white, but in the morning and evening, the sun they see is generally warm red. Obviously, this time Beijing's "blue sun" is very special.

Speaking of it, although the "blue sun" is rare on the earth, it is very common on Mars. Many people can see the "blue sun" on Mars in the photos sent back by the rover.

Let's take a look at the specific causes of the "blue sun" on Mars. Speaking of it, the color of the sun we see on the earth is not the real color of the sun, but the color produced by the refraction of light in the earth's atmosphere.

On Mars, there is a "blue sun" because the atmospheric composition of Mars is different from that of the earth, and because the atmosphere of Mars is very thin and the atmospheric pressure is very low, there are a lot of weathered sand grains in the atmosphere of Mars. Therefore, when the sun shines into the atmosphere of Mars, there will be serious scattering, so on Mars, the sun you see is blue.

As for why the sun people see on the earth is generally red, the reason is that it is just the opposite of the "blue sun" on Mars, because the scattering is not serious, so that red light is seen by us.

In recent days, there have been many sandstorms in Beijing because of the dusty weather in the north. There are more sand grains in the air in Beijing, which is similar to the scattering phenomenon on Mars. Therefore, there will be a "blue sun" in the sky in Beijing.

Moreover, this is not the first time that "Blue Sun" has appeared in Beijing. Although it is rare, almost every time there is serious dusty weather, the circle of friends of Beijingers will also be screened by the "blue sun".

For example, in March last year, northern China 12 provinces and cities were hit by the strongest sandstorm weather in 10 years. Many places are covered with yellow sand. It looks as if they live on Mars. At that time, a rare "blue sun" appeared in the sky in Beijing.

In addition, in addition to dusty weather, if there is a serious fire in a place, the burning smoke will also enter the air. In fact, you can also see the "blue day", and the formation principle is consistent with the "blue day" in dusty weather.

For example, according to China's report,1September, 950, after the fire broke out in Canada, there was a "blue day" in the skies of many European countries. Because of the influence of the wind direction, the smoke from Canada was blown over Germany, France and Switzerland.

In addition to Beijing, whenever there is dusty weather in northern China, the same "blue sun" will appear in many places. This is actually a very simple natural phenomenon, which does not mean that the earth's climate will become Mars. Everyone doesn't need to be afraid or worried about it.

Every spring is the season of high dust weather in northern China, and dust weather has become one of the most common disaster weather in northern China. So, why is it easy to appear in northern China?

Speaking of it, this is actually related to our neighbor-Mongolia. Due to less precipitation in spring and more dust on the surface of Mongolia, it is very easy to have dust weather in windy conditions, which blows all the way to the north of China.

For example, the dusty weather in China last March was also related to Mongolia, and in Mongolia, the dusty weather in March last year also led to the tragic death of many herders.

In addition, in addition, the northern part of China has always been "short in spring and long in neck", and the spring is relatively short every year, which is prone to persistent windy weather. Nature is more likely to cause dusty weather.

Therefore, the best way to reduce the occurrence of sand-dust weather and its series of impacts is to "retreat sand for afforestation", but this cannot be solved by China alone. After all, the dusty weather in China comes from neighboring countries every year. Therefore, the key to solve the problem is that neighboring countries do a good job in dust control and protect the ecological environment.

Here, I would also like to remind you that it is best to wear N95 mask when going out in dusty weather, and pay attention to wearing protection at the same time, so as not to be harmful to your health.