What time is the Frost Descent solar term in 2018? Climate characteristics of the Frost Descent season
The arrival of Frost means that the weather is getting colder, the dew condenses into frost, and it also means the beginning of winter. So, when is the Frost Descent solar term in 2018? What are the climatic characteristics of the Frost Descent season? Want to know more about the days in the ninth month of the lunar calendar in 2018? Please pay attention to our Mr. Shui Mo’s special feature on September of the lunar calendar!What time is the Frost Descent solar term in 2018?Gregorian calendar time: October 23, 2018, 19:22:18, Tuesday Lunar calendar date: September 15, 2018, Tuesday Start time: October 23, 2018, 19:22:18, Tuesday End time: November 7, 2018, 19:31 WednesdayIntroduction to the Frost Descent Solar Term:The Frost Descent solar term means that the weather is getting colder and frost begins to fall. In the Sichuan Basin, which is located in the southern latitude, the average temperature is around 16℃, and there are still three solar terms away from the first frost date. In the river valleys in the southern part of the basin, frost does not appear until midwinter. Of course, even in places with the same latitude, due to different altitudes and terrains, the temperature and humidity of the air close to the ground are different, and the first frost period and the number of frost days will also be different. From a scientific point of view, the saying that "dew turns to frost" is inaccurate. Frozen dew is formed by the freezing of dewdrops, which are hard small ice beads. Frost refers to the phenomenon of crop damage caused by a sudden drop in temperature. The damaging temperature varies depending on the crop, variety and growing period. For frost to form, the temperature of the ground or ground objects must drop below 0°C, and the water vapor content in the air in the ground layer must reach a certain level. Therefore, frost does not necessarily occur when frost occurs, and frost does not necessarily occur when frost occurs. However, because the temperature is already relatively low when frost appears, if it continues to cool down, it will easily lead to frost. After the Frost Descent, people in the basins of our province began to harvest sweet potatoes in large quantities. If the potatoes are harvested too early, the tubers have not yet fully expanded, which will affect the yield; but if they are harvested too late, they may be damaged by early frost, and the tubers may be frozen and spoiled and cannot be stored. Therefore, it is important to dig the potatoes at the right time. Su Shi, a great writer of the Northern Song Dynasty, wrote a poem: "Thousands of trees are swept into yellow, only the hibiscus is fragrant alone." The Sichuan Basin has a mild climate. During the Frost Descent, the fields are green, the oranges are orange and green, the autumn chrysanthemums are in full bloom, and the hibiscus trees are in full bloom, making the rich "land of abundance" even more gorgeous.Climate characteristics during the Frost Descent season:During the Frost Descent season, if there is a relatively strong cold air moving south, the surface temperature of the ground will drop to 0℃ or lower, and the water vapor in the air near the ground will reach saturation, and it will directly condense on the ground or near-ground objects to form tiny ice crystals.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. |
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