Why is the sunset of the circle of friends so beautiful?There are these scientific knowledge hidden behind

The sunset of Taihu Lake in Wuxi is full of water and sky; the sunset in the ancient city of Yangzhou is overflowing; the sunset in the Nanjing River is unpredictable ... For many consecutive days, the sunset in many places in Jiangsu has stunning countless people. The high -value sunset "big blockbuster" exploded the "circle of friends". A touch of the sunset not only dressed up the city, but also forgot to forget the high temperature for the time being. Do you apply a thick makeup for the sunset at high temperature, or the love of the late summer and early autumn make the sunset red? In fact, the formation of beautiful sunset is hidden with interesting scientific knowledge.

In the past few days, all parts of Jiangsu were lying steadily in the embrace of a subtropical high -pressure, and the popularity of high temperatures was even more successful. The gorgeous sunset is eye -catching. Regarding the formation of the sunset, Dr. Yi Yi, the School of Atmospheric Sciences of Nanjing University of Information Technology, introduced that the sunset is a kind of light, and its formation is inseparable from the "Ruili scattering". At the same time, after the formation of Xia Guang, the high temperature did describes a few strokes, making Xia Guang even more gorgeous.

"Ruili San Rap" is a optical principle named after British physicist Ryley. More than 100 years ago, Ryley found that there are many tiny particles in the atmosphere, which will cause light to deviate from the original dissemination direction through the atmosphere and change it to the surroundings. This phenomenon is called the scattering of light in the atmosphere. The conditions of Ruili scattering need to meet the scale of the particles far less than the incident light wavelength. The strength of the intensity is inversely proportional to the four squares of the incident light wavelength. Therefore, the shorter the wavelength, the stronger the scattering.

"During the process of sunlight to the ground, it will be blocked by the molecules in the atmosphere and the phenomenon of Ruili scattering. However, only the purple light and blue light with short wavelengths are difficult to surpass obstacles, 'forced to disperse'; The longer light can easily "cross the obstacle". "Fan Yi introduced that during the sunrise and sunset, the sun was near the horizon, the sun was obliquely shot, and the long distance was needed. Long, in the process, the blue purple light was "lost" by the scattered scattered, and the red light and orange light left will form glow.

The weather is sunny, the sun is sufficient, the ground evaporates strong, and the water vapor is high in the atmosphere. More pure and gorgeous. Fan Yi introduced that the sunlight, clouds, and water vapor are more beautiful.

The beauty of the sunset is so beautiful, why is Chaoxia less color? It turns out that the beautiful clouds in the sky in the summer are often against the clouds, and the formation of this cloud is closely related to the surface temperature.

Fan Yi further introduced that the temperature on the surface in summer is high, and it has a strong heating effect on low -level atmosphere. The temperature becomes warmer than the high -rise after heating the low -level air, and it will do the upward movement, just like a hot air balloon, slowly climbing to the sky with the help of heat; Like a certain height, the temperature decreases, giving people a feeling of "high altitude", the air will encounter cold coagulation to form a cloud when the air reaches a certain height. The temperature before the sunrise in the morning is relatively low in the day. Only when the temperature rises and the evaporation is accelerated, there are more water vapor that enters the atmosphere, and the form of the ultimate cloud is richer. Generally speaking, in the evening, after a whole day of heating and evaporation, it is when the remaining heat is not exhausted. The conditions of water vapor and cloud in the atmosphere are better than the morning, so the sunset is more beautiful than the morning glow.

The Jiangsu Meteorological Observatory continued to issue high -temperature red warning signals at 16:14 on August 12: Nanjing, Zhenjiang, Wuxi, Suzhou, Changzhou, Nantong, southern Taizhou, and southern Yangzhou can still reach 40 ° C or above. Although it is annoying to be high temperature, it is also a pleasant to accompany the beautiful glow.

Xinhua Daily · Jiaojiao Reporter Hu Jingjing/Wen Han Jun/Picture

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