Affected by sandstorms, Beijing reappears the blue sun of Mars. When will the sandstorm weather subside?

On March 28th, 20021year, a gray weather greeted Beijing. At present, sandstorms and strong winds have entered Beijing. According to the actual situation of Beijing Ecological Environment Monitoring Center, as of 8: 00 this morning, the air quality index was 500, and the city has reached level 6 serious pollution. Out of line? . At 7 o'clock today, the specific data of PM 10 concentration in each region are: Chengliu District: 2673; Northwest: 3298; Northeast China:1528; Southeast:1913; Southwest: 3 198. Under the influence of the northwest wind, the dust from Mongolia continues to spread to the southeast, and there are obvious dust weather in Beijing and other places. The average concentration of PM 10 in Beijing is over 2000 μ g/m3, which is a serious air pollution of Grade 6. With the weakening of wind, the impact of night dust on Beijing's air quality will gradually weaken. The Beijing Meteorological Observatory just announced that the visibility in Beijing has obviously improved, and 18 lifted the yellow warning signal of sandstorm.

Some netizens found that the sun in the sky turned blue, just like the sun seen on Mars. ? Blue sun? It reappears over Beijing because there are large particles in the air, such as dust, water droplets, pollutants, etc., and the light scattering mode changes, resulting in rice scattering. Is this the same one on Mars? Blue sun? ! Because the sun on Mars is often covered with dust, it will appear blue. Due to the existence of dust, water droplets, pollutants and other large particles in the air, the scattering mode of light changes, resulting in rice grain scattering, also known as coarse particle scattering and large particle scattering. Interestingly, there are similar ones on Mars? Blue sun? Because the sun on Mars is often covered with dust, it is easy to make the sun appear blue.

Hu Xiao, chief meteorologist of China Meteorological Network, said that this was because the particles in the dust scattered and absorbed red light with longer wavelength, which led to less red light, so the sun looked blue. While doing a good job of dust prevention, don't forget to look up at this rare sight. It is reported that this is the same one on Mars? Blue sun? ! Because the sun on Mars is often covered with dust, it will appear blue. In other words, what we see is a common sight on Mars. It is worth mentioning that on March 15, the dust went north and the sky appeared in Beijing and other places? Blue sun? .

In the real-time monitoring of FY-4 meteorological satellite, the spiral eye area of Mongolian cyclone cloud system, as an important driving force behind the dust process, is clearly visible in the northeast of Inner Mongolia. It is reported that Mongolian cyclone is an temperate cyclone, which is an important weather system affecting northern China. It can occur all year round, especially in spring and autumn. The most prominent feature is strong wind, accompanied by cold wave, dust, rain and snow. For example, the cyclone in Mongolia is very strong, and the lowest pressure near the center reaches 990 hectopascals. 9-10 Instantaneous gale, typhoon and tropical storm occurred in eastern Inner Mongolia this morning? Strong tropical storms are similar. The wind is strong and brings a lot of sand.