Why does the frost appear early in Shanxi? Is it related to geographical location?

Mr. Bai of Shanxi Meteorological Observatory issued a blue warning of frost. The early warning areas are Taiyuan, Shuozhou, Xinzhou, Lvliang, Jinzhong and Datong. The first frost in the west of the mountain island is now a normal phenomenon, which has nothing to do with geographical location and occurs every year.

Frost blue alert? It means that the ground minimum temperature will drop below 0℃ within 48 hours, which will have an impact on agriculture, or it has dropped below 0℃, which will have an impact on agriculture and may continue.

Shanxi Meteorological Observatory predicts that under the influence of strong cold air, there will be four to six or seven northwest winds in a short time from day to morning on the 3rd, and the temperature will drop significantly. On the 4th night, the minimum temperature will drop below two degrees, and the first frost will appear in most areas. Strong winds and cool weather will have a certain impact on citizens' holiday travel, so citizens should pay attention to safety when going out. At the same time, strong winds and frosty weather have a negative impact on protected agriculture and fruit and vegetable production, increasing the risk of forest fires. Relevant departments and farmers engaged in facility agriculture should strengthen their prevention. Frost is a common agrometeorological disaster. Frost usually occurs in autumn, winter and spring. It's different from? Frost? Frost means that the air humidity near the ground is saturated and the ground temperature is below 0? C, the object is directly condensed by white ice crystals, with or without frost. Frost does not necessarily appear when there is frost, and frost does not necessarily appear when there is frost.

Generally speaking, the first frost in autumn is called? Early frost? Or? First frost? The date of the first frost is different. The first frost appeared in Inner Mongolia and Northeast China in mid-September,1/at the beginning of the month, the frost line moved south to Qinhuai area, and 1 1 at the end of the month, it appeared in Southwest China and the Yangtze River Plain. Nanling arrived in early February, 65438, and the first frost in North China and Central China occurred from the end of February to the middle of 10. The damage of frost to crops is mainly caused by cell dehydration, metabolic damage, protoplasm structure damage and mechanical damage of intracellular ice. Autumn frost often hinders crop maturity and seriously affects yield. Autumn frost in North China and the Yangtze River valley seriously affects cotton yield and quality.

In order to prevent frost disaster, various preventive and anti-frost measures are usually taken, such as timely irrigation, fumigation, covering or spraying chemicals before frost, strengthening field management after frost, increasing the humidity of near-surface air and protecting geothermal energy. The purpose of frost prevention is to raise the temperature and delay the decline of geothermal energy. 1. Fumigation should be carried out at midnight before frost occurs. Mild weeds, leaves or smoke contain chemicals with low toxicity, so that the ground is covered with a layer of smoke, which reduces the effective radiation cooling of the ground, increases the ground temperature, reduces or avoids frost, and achieves the purpose of frost prevention. Figure 2. The invention can timely and reasonably irrigate wheat fields and fruit trees, improve the heat capacity and thermal conductivity of soil, and reduce the temperature of soil and air near the ground, thus relatively increasing the temperature of soil and surface layer and alleviating or preventing frost. If conditions permit, irrigation and fumigation will be better before frost appears.

Covering plants and seedbeds with economic value, the protection area is not large, and plastic film or reed can be used to protect the covered crops from the direct influence of external cold air, and their temperature will not directly spread outward, so that the temperature will not drop too low, thus playing the role of heat preservation and frost prevention. This method has the best anti-freezing effect, but the cost is higher.