What is the origin of Lidong? What are the weather characteristics after Lidong
4hw.org: starting from today, the weather turns cold gradually, which also marks the beginning of winter in China. It's one of the 24 solar terms in China. Do you know the origin of it? What are the characteristics of the weather after it? Let's take a look at it together!
The origin of the solar term in the beginning of winter
In ancient China, it was the beginning of winter to start the folk custom. "Moon order 72 Hou Ji Jie" said: 'set up, start also', said: 'winter, end also, everything collection also. "It means that all autumn crops have been collected and dried, and the animals have been stored for hibernation. It seems that the beginning of winter not only represents the coming of winter. In a complete way, beginning of winter means the beginning of winter, the collection of all things, and the return to avoid the cold.
"Lidong" is the same as "Liqiu". The ancients also used divination methods to see the warmth and coldness of winter in this season, such as "Lidong is sunny, Yidong is cold", Lidong is cloudy (rainy), Yidong is warm (warm winter). " Without exception, in ancient times, on the day of the beginning of winter, the emperor would personally lead three gongs and nine officials to the northern suburbs to welcome the winter.
In ancient China, the beginning of winter was divided into three periods: 'first, water begins to ice; second, ground begins to freeze; third, pheasant people's water becomes mirage. 'the solar term water has been able to form ice; the land has also begun to freeze; the pheasant in the three seasons' pheasant man's water is a mirage' refers to a large bird like pheasant, a mirage is a large clam. After winter, there are few large birds like pheasant, but the clam with similar shell and color can be seen at the seaside. So the ancients thought that the pheasant would become a big clam after the beginning of winter.
In the beginning of winter, the sun has reached the Yellow longitude 225 & deg;, and the amount of solar radiation in the northern hemisphere is getting less and less. At this time, the heat stored on the surface in summer and half a year still has a certain surplus, so it is generally not too cold. When it is sunny and windless, there is often a warm and comfortable 'little spring' weather, which is not only very pleasant, but also very beneficial to the growth of winter crops. However, at this time, the cold air in the north also has a strong force, often invading South frequently, sometimes forming a cold wave with strong wind, cooling and accompanied by rain and snow.
China's solar term is the carrier of farming customs. History has passed, leaving behind culture. Festival customs are actually agricultural customs (food customs are also one of them). Although it has no practical significance in modern life, it adds to the interest of life. Lidong, Lichun, Lixia and Liqiu are called four Lili, which is an important festival in ancient society. On this day, the emperor will lead all officials of civil and military affairs to the northern suburb of the capital to set up altar for sacrifice. At present, people in the beginning of winter, also want to celebrate, beginning of winter to fill all over the 'eat' multifarious. Most people in the North want to eat dumplings on the first day of winter, while in the south of China, people like to eat some chicken, duck, fish and so on.
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The weather characteristics of the solar term in the beginning of winter
Before and after the beginning of winter, the precipitation in most areas of China decreased significantly, the air was generally drying, and the soil moisture was less. The snow on the snow mountain of the plateau is no longer melting. The first snow often appears in North China and other places. The first snow in Beijing is difficult to predict and has a great impact, which often needs special attention. The rain days and rainfall in the north of the Yangtze River and South China are less than those in the south of the Yangtze River. At this time, the forms of precipitation are diversified: rain, snow, sleet, graupel, ice particles, etc. When there is strong cold air, it will snow in Jiangnan.
In Southwest China, the typical rainy days in West China are over, but compared with the situation that there is little rain in China, it is still a place with more rain. According to the time distribution of precipitation in Southwest China, November is the dry season of the year. The characteristics of dry season in the southwest and northwest are more obvious. In the Sichuan Basin, the eastern part of Guizhou and the southwestern part of Yunnan, there was more than 50 mm of rainfall in November. In Yunnan, it's warm on a sunny day and cold on a rainy day. It's said that "four seasons are like spring, one rain is like winter". If there is strong cold air intrusion and warm moisture flow, the process rainfall in the South will be larger.
With the strengthening of cold air, the trend of temperature decrease is accelerated. People are used to the cooling in the north. Since late October, heating has been carried out successively, which is good for people to have a shelter. But for the people in the middle and lower reaches of the Yangtze River in the late autumn, if they encounter strong cold air and go south rapidly, sometimes in less than a day, the temperature drop can be close to 8-10 ℃ or even more. But after all, when the wind blows and the sun shines, the air conditioning mass changes quickly and the temperature picks up quickly. The recovery of temperature and the accumulation of heat make the next round of cold air bring strong cooling. At this time, the pleasant late autumn weather is close to the end. The obvious cooling makes this area enter into the initial frost period and the best viewing period of red leaves, and gradually enter into winter at the end of November.
In November of a normal year, the first frost will appear from Qinling in the north, the West and the south of Huanghuai River, and from the south to the north of Jiangnan. In the cold years, in the middle of November, the first frost will appear in the north of Nanling.
In the north of November, as the front of the cold air moved out, the cold air mass behind the front began to change to the warm side. If there is no follow-up cold air supplement, after a few days, although the temperature has picked up, the air quality has gradually deteriorated. Especially in big cities, the accumulation of water vapor and pollution particles in the atmosphere combined to form smoke or dense fog, which affects people's health and traffic operation. In the southwest and south of China, the water vapor condition is better than that in the north. If the temperature is low in the morning, there will be a lot of fog.