Why is Frost Descent called Frost Descent? At what temperature will frost appear?
I believe everyone is familiar with the Frost Descent solar term. So, let’s take a look at why Frost Descent is called Frost Descent? At what temperature will frost appear? In the ninth month of the lunar calendar in the Gengzi Year of the Rat, Cold Dew will come and will definitely delay leaving. What will be your fortune in September 2020? Let’s find out together with Shuimoxiansheng.com!Why is Frost Descent called Frost Descent?Frost Descent means that the weather is gradually getting colder and frost begins to fall. In meteorology, the first frost in autumn is generally called "early frost" or "first frost", while the last frost in spring is called "late frost" or "final frost". The period from the last frost to the first frost is the frost-free period. Some people also call the early frost "chrysanthemum frost", because chrysanthemums are in full bloom at this time. Su Shi, a great writer in the Northern Song Dynasty, wrote a poem: "Thousands of trees are swept into yellow, only the lotus is fragrant alone."Because frost can only form on sunny days, there is a saying that "thick frost and strong sun". There is a poem called "Frost Descent" which says: "At the end of autumn, dew turns to frost, some condensed and some sunny. Lotuses wither on the desolate banks of thousands of ponds, and cotton grows white in the vast expanse of land and is harvested." At what temperature will frost appear?The formation of frost is related to weather conditions and the properties of the object it attaches to. The temperature of the surface of an object is very low, while the temperature of the air near the surface of the object is relatively high. Then there is a temperature difference between the air and the surface of the object. If the temperature difference between the surface of the object and the air is mainly caused by radiation cooling of the surface of the object, then when the warmer air comes into contact with the colder surface of the object, the air will cool down, and when the water vapor is supersaturated, the excess water vapor will precipitate.If the temperature is below 0°C, the excess water vapor condenses into ice crystals on the surface of the object, which is frost. What are the effects of frost?1. Impact on cropsFrost is a relatively common agricultural meteorological disaster. It refers to a sudden drop in air temperature, with the surface temperature dropping sharply below 0°C, causing damage to crops or even death. Frost usually occurs in autumn, winter and spring. It is different from "frost". "Frost" is white ice crystals that condense directly on objects when the water vapor in the air near the ground reaches saturation and the ground temperature is below 0℃. Frost is not necessarily frost when there is frost. 2. Impact on health During the Frost Descent solar term, cold air moves southward more and more frequently. The cool autumn wind has reached Guangzhou, the city of flowers. The average temperature in northern Northeast China, eastern Inner Mongolia and most of Northwest China is already below 0℃. In northern my country, around the time of Frost Descent, the temperature dissipates quickly at night, drops below 0 degrees Celsius, and snow and frost appear. During the Frost Descent season, health care is particularly important. There is a folk saying that goes, "It is better to take care of yourself during the Frost Descent than to take care of yourself all year round," which shows the impact of this solar term on people. Want to know your destiny? Click on the following exquisite calculation to predict your destiny. |
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