Astronomical characteristics of light snow solar terms

Xiaoxue solar term is the twentieth solar term among the twenty-four solar terms, and the solar term is named after phenology. When the light snow solar term begins, the temperature will drop and there will be three phenological phenomena. What are the three stages of light snow phenology? Come and have a look with me!

I still want to know. Twenty-four solar terms: Is Xiaoxue married?

165438+1October 22nd is the "light snow" among the 24 solar terms. When the longitude of the sun reaches 240 degrees, the light snow solar term begins. At this time, the temperature dropped, the temperature of the gas layer gradually dropped below 0℃, and snowfall began, but the amount of snow was not large. During the light snow solar term, a relatively stable meridional circulation has been established in East Asia, and low pressure or trough often appears in Siberia. When moving eastward, there will be a large-scale cold air going south, and there will be a large-scale gale and cooling weather in eastern China. Light snow solar term is a solar term with high frequency of cold wave and strong cold air activity. When strong cold air affects, it is often accompanied by the first snow in winter.

In the light snow solar terms, the first time is the rainbow, the second time is the sky is high and the clouds are light, and the third time is blocked from entering the winter. It means: due to the drop in temperature, it is snowy below the north, no more rain, and no rain rainbow can be seen; Because of the rising of the yang in the sky and the falling of the yin in the ground, yin and yang do not meet, and heaven and earth are blocked; So heaven and earth became one, and it became a cold winter. China has a vast territory, and the "light snow" representatively reflects the climate in the middle and lower reaches of the Yellow River. At this time, the north has entered the freezing season. "There is no rain in the lotus, but there are still Ao Shuang branches in the chrysanthemum", which has already presented the scene of early winter. Generally speaking, the weather during the "light snow" period presents the following two climatic characteristics: the temperature continues to fall.

During the solar term in beginning of winter, there is snow in most parts of northwest and northeast China. In the light snow solar term, it means that there will be snow in North China. If the beginning of winter solar term marks the entry of winter in most parts of northern China, the direct performance of cold air is to gradually make the temperature in these areas reach below 0℃ in the light snow solar term. We all know that precipitation will change from rain to snow only when the air temperature under clouds and clouds is lower than 0℃. Therefore, it is an indisputable fact that the temperature in light snow stage is lower than that in winter stage. The middle and lower reaches of the Yangtze River have entered winter one after another.

Beginning of winter solar terms basically entered winter in northern China, and in the light snow solar terms, many areas in the middle and lower reaches of the Yangtze River entered winter one after another. Although with the arrival of winter, the precipitation in the whole country has gradually dropped to the lowest point in a year, the rainfall in Jiangnan is still higher than that in Jiangbei. Even if the first snow only appeared in the middle and late June of 65438+February in this area, the rainy weather at this time gave people a feeling of wet and cold rather than cool in late autumn, which was much worse than that of people with heating conditions in dry and cold areas in the north.