Two cold air will affect our country successively. Are you ready to calm down?

No, my area is Guangdong, and cold air can't affect it. A few days before the Spring Festival holiday, the temperature in most parts of the country was higher than in previous years. Since yesterday (February 14), affected by cold air, 6? With the cooling of 10℃, moderate to heavy snow appeared in eastern Jilin and central and eastern Liaoning, and even snowstorms appeared in parts of Yanbian, Baishan and Tonghua in Jilin. The Central Meteorological Observatory predicts that in the next three days, two cold air will affect China, and there will be strong winds and cool weather in the central and eastern regions. /kloc-from 0/8 to 20, the temperature will obviously rise in most parts of the country.

The influence of cold air The main influence of cold air intrusion is to bring cooling and strong winds, and sometimes there will be a wide range of rain and snow weather, which is the result of the intersection of cold and warm air. When the warm and humid air conditions are not good and the circulation conditions are unfavorable, the invasion of cold air does not necessarily bring precipitation weather. Therefore, it is not that the stronger the cold air, the stronger the rain and snow weather.

Human body aspect

First of all, strong cold air can obviously reduce the humidity in the air, make the nasopharyngeal mucosa dry and produce tiny wrinkles, and the cold virus can take advantage of it. At the same time, due to the decrease of temperature, the local temperature of nasopharynx can be reduced to about 32℃, which is just suitable for the virus to grow and reproduce in the mucosal gap. In addition, the stimulation of the respiratory tract by strong cold air can cause local vasoconstriction and decrease the immunoglobulin secreted by the mucosa, which provides more favorable conditions for the invasion and reproduction of cold virus.

Secondly, within 2-3 days before and after the attack of strong cold air, the average temperature and minimum temperature suddenly dropped, and the temperature regulation function of human body was difficult to adapt to this sudden cold stimulus. If you don't add clothes to keep warm in time, you will be particularly prone to catch a cold, which will reduce your body's resistance and create opportunities for the invasion of various cold viruses.

In addition, due to the temperature drop, the ciliary activity of bronchial mucosa epithelium decreases, the function of tracheal excretion of foreign bodies decreases, and the bacteria on respiratory tract easily spread downward, making chronic bronchitis more frequent or aggravated; Although pneumonia is an infectious disease caused by germs, its occurrence and deterioration are also related to cold air activities.

agriculture

When cold air strikes, it is necessary to strengthen agricultural production management and reduce the impact of strong winds and cold waves on agriculture. All localities need to do a good job in wind protection and reinforcement of greenhouses; North China, Huanghuai, Jianghuai and other places should guard against the harm of low temperature frost and cold wave weather to agriculture; Xinjiang and other places should seize the time to harvest cotton, and Inner Mongolia and other pastoral areas should do a good job in wind and cold protection for livestock.