Sources and Climate Characteristics of Solar Terms in Grain Rain

Sources and Climate Characteristics of Solar Terms in Grain Rain

The origin and climatic characteristics of solar terms in Grain Rain Grain Rain means that rain produces hundreds of valleys. According to the 24 solar terms, Grain Rain is the last solar term in spring, and Grain Rain in late spring means that spring is coming to an end and summer is coming. Here, we will share the origin and climate characteristics of solar terms in Grain Rain.

The origin of solar terms in Grain Rain and its climatic characteristics 1 the origin of solar terms in Grain Rain

Grain Rain means "Rain gives birth to hundreds of valleys", and it is Grain Rain when the sun reaches 30 on April 20th or 2 1 day every year. "Twenty-four solar terms" said, "In mid-March, after the rain, the soil paste pulsates, and now it rains, and its valley is in the water ... At this time, the valley is planted from bottom to top", hence the name.

As for the origin of Grain Rain Festival, according to Huainanzi, it is an earth-shattering event to create characters in Cangjie. The Yellow Emperor issued imperial edicts in late spring and early summer, announcing the success of Cangjie's word-making, and calling on all the people in the world to * * * the ambition of Xi. An unusual rain fell on this day, leaving countless Gu Mi, so later generations named this day Grain Rain, which became one of the 24 solar terms.

But among the people, there is a story circulating in Guanzhong, Shaanxi Province: It is said that more than 4,000 years ago, Huangdi in Xuanyuan urgently needed a historian in charge of historical materials. One day, the Yellow Emperor discovered Cang Xie with both ability and political integrity and appointed Cang Xie as a historian. He remembered the important events of the country clearly by tying knots, which was very appreciated by the Yellow Emperor. Later, the knot notes became more and more backward.

Once, Cang Xie went out hunting with a hunter. The hunter pointed to the traces of various wild animals left on the ground and told the whereabouts of wild animals. Cang Xie was deeply inspired: "A footprint represents a thing!" After returning home, Cang Xie packed up and went out for a trip. He climbed mountains and waded in water, was not ashamed to ask questions, and expressed everything he saw according to its characteristics. Pictographic by class, original text. Because of his contribution to word-making, he touched the Emperor of Heaven. At that time, there was a famine in the world, so he ordered the heavenly soldiers to open the granary of the Heavenly Palace, and millet was planted, and all the people in the world were saved.

After Cang Xie's death, people buried him in his hometown-north of Shiguan Town, Baishui County. There is a couplet engraved at the entrance of the tomb: "The rain millet feels that the Emperor of Heaven was in those days, and the same language matches the bridge Lingyong." People set the day of offering sacrifices to Cang Xie as the day of Grain Rain, which is now "Grain Rain Festival". Nowadays, every Grain Rain Festival, there is a temple fair in Shiguan Town, Baishui County to worship Cang Xie.

Climatic characteristics

First, sandstorms.

According to the 24 solar terms, Grain Rain is the last solar term in spring. Grain Rain in late spring means that spring will end and summer will come. The large-scale invasion of cold air into the south is rare, but the cold air activities affecting the north will not stop.

From the end of April to the beginning of May, the temperature is much higher than that in March, and the soil is dry and loose. The air layer is unstable, the high-altitude wind drops, the frontal cyclone is active, and the windy and dusty weather caused by * * * is more common.

During Grain Rain 1993, 1995, 1998 and 2005, there were strong sandstorms and sandstorms. Among them, the black wind occurred in Jinchang, Gansu on May 5, 1993. The instantaneous maximum wind speed reaches 34m/s( 12), and the visibility drops sharply to zero. The sandstorm wall formed by aeolian sand is as high as 300-400 meters, and has a three-layer structure. Each layer has a spherical dust ball rolling, the bottom layer is black, and the middle and upper parts are red and yellow, once an hour. It caused heavy casualties and economic losses, and it is still creepy.

A wide range of floating dust weather, dark sky and falling yellow dust have made the poet's picture of grass growing and warblers flying, flowers red and green, and spring full.

Second, the spring drought.

Huaihe river basin is a transitional zone between the spring rain area in the south of the Yangtze River and the spring drought area in the north. From the north of the Huaihe River in Qinling Mountains, the spring rain dropped sharply.

As the saying goes, "Qingming Grain Rain is often short of rain", which means that during these two solar terms, there is a shortage of rain. During Grain Rain, people in Hainan Island, western Sichuan, western Guangxi, northwest China and north China are more eager for rain. Generally speaking, there are many sunny days, strong sunshine, large evaporation, windy sand and dry air, so the rain is more expensive at this time. Winter wheat, rape and other overwintering crops need rain when they enter maturity, and millet, corn, sorghum, cotton and vegetables sown in spring also need rain to take root and sprout and thrive in Miao Zhuang. At this time, it is equivalent to planting food when it rains!

If there is little snowfall in winter, it is easy to get dry. It is very important to take measures such as water-saving irrigation and artificial precipitation enhancement in areas with severe drought in September once every ten years.

Spring drought is also an accomplice of forest and grass fires, which can be said to be a key stage to strengthen forest fire monitoring and fire prevention propaganda in forest areas.

The third is strong convective weather.

Generally speaking, April to August is the peak period of strong convective weather in a year. In May, severe weather such as thunderstorms, hail, strong winds and tornadoes will increase significantly in many areas in the south. Lightning protection, hail suppression and wind protection are put on the agenda.

Fourth, heavy rain.

In the middle and lower reaches of the Yangtze River and the south of the Yangtze River in China, it often begins to rain obviously, especially in South China. Once cold air meets warm and humid air, it often forms a long rainy day, and it has entered the first flood season of the year.

Strong convective weather wrapped in clouds and rain will not only bring disasters such as hail and thunderstorm, but also be accompanied by short-term, local rainstorm or torrential rain. 24-hour rainfall can reach more than 300 or 400 mm, resulting in river flooding and serious waterlogging, and long-term heavy rain will also lead to mudslides, landslides and other disasters.

The origin and climate characteristics of the two solar terms in Grain Rain. Historical origin.

Grain Rain is the last solar term in spring, and Grain Rain is taken from the meaning of "Rain gives birth to hundreds of valleys". In the traditional farming culture, the solar terms in Grain Rain link "valley" with "rain", indicating the precipitation situation, and "rain gives birth to hundreds of valleys". The most important feature of Grain Rain is the continuous spring rain, which embodies the significance of "Grain Rain" in agricultural climate and is also the reflection of ancient farming culture on festivals. After the solar term in Grain Rain, the temperature rises, the rainfall increases, and the humidity in the air further increases, which is very suitable for the growth of cereal crops.

"Tongwei Filial Piety Helps the Gods" said: "In the fifteenth day after the Qingming Festival, the bucket refers to Chen, which is Grain Rain. In mid-March, it was said that the rain gave birth to hundreds of valleys, clean and bright. " "Qunfangpu" also records: "Grain Rain, there is rain in the valley." Before and after Grain Rain, the weather turned warmer and the rainfall increased, which was beneficial to the sowing and growth of spring crops. It is recorded in the twenty-four solar terms: "In mid-March, after the rain, the ground paste pulsates, and now it rains and its valley is in the water. Rain is silent, just like the rain in my field. At this time, cover the valley and sow, from top to bottom. " At this time, the weather is mild and the rainfall increases obviously, which has a great relationship with the growth and development of cereal crops.

Meteorological change

The main feature of the weather in Grain Rain is rainy. After the solar term in Grain Rain, the rainfall increases and the humidity in the air gradually increases, which is beneficial to the growth of crops. After entering the Grain Rain solar term, the precipitation in the middle and lower reaches of the Yangtze River and the south of the Yangtze River increased obviously, especially in South China. Once cold air meets warm and humid air, it will often form rainy weather for a long time. The Huaihe River Basin in Qinling Mountains is basically the dividing line between the spring rain in the south of the Yangtze River and the spring drought in the north. From the Qinling-Huaihe River to the north, the spring rain decreased sharply. In the north, Grain Rain is a symbol of the "final frost". There are few cases of large-scale invasion of cold air into the south, but the cold air activities affecting the north have not stopped, and early thunder will appear in many places.

Phenological phenomenon

In some ancient works of China, Grain Rain is divided into three stages: "The first stage is when Ping was born; The second time, pigeons blow feathers; The third is that Dai Sheng fell to Sang. " After Grain Rain, rainfall increased, duckweed began to grow, then cuckoo began to remind people to sow, and then Dai Sheng birds began to be seen on mulberry trees.