What is the cold wave?

Cold wave is a natural weather phenomenon.

Cold wave belongs to a form of air (cold air) flow. Cold wave is cold air from high latitudes, which rapidly strengthens under certain weather conditions and invades middle and low latitudes, causing a wide range of severe cooling, strong winds and rain and snow weather along the way. When this cold air reaches a certain standard, it is called a cold wave.

Cold wave is cold air from polar regions or cold zones in winter, which invades the middle and low latitudes on a large scale like tides. When a cold wave strikes, the temperature will drop sharply, accompanied by strong winds, rain and snow. The cold wave invading China mainly broke out in the Arctic, Siberia and Mongolia.

Most of these areas are located in the Arctic. In winter, there is no sunshine for a long time, and there is snow and ice everywhere. The air masses staying in these areas are getting colder and drier. When this cold air mass accumulates to a certain extent and the air pressure increases to a level much higher than that in the south, it is like a flood stored in a mountain. At the first opportunity, it floods to the south with lower air pressure, forming a cold wave.

Introduction of cold wave anti-freezing measures;

1, outdoor heating

Disturbing the inversion layer by arranging smoke piles, installing blowers and other conditions to increase the near-surface temperature has a significant warming effect on the near-surface layer, in which smoking can generally increase the near-surface temperature by 1-2℃.

2. Vegetation coverage

Covering is used to protect the above-ground or underground parts of plants that are afraid of freezing, reduce long-wave radiation on the ground, and defend against cold wind, thus playing a role in cold protection. There are two kinds of mulching: horizontal and vertical, including direct mulching on crops or fruit trees, scaffolding covering and wrapping. Windshield also has a good effect on preventing freezing injury, and different types of windshields with different inclination angles can be adopted according to the actual situation.

Step 3 spray chemicals

Mainly used for anti-freezing of fruit trees. Spraying chemicals to prevent freezing injury, first, using growth hormone to control the growth law of fruit trees and enhance the cold resistance. Chemical methods to prevent freezing injury are emergency measures, and short-term cold wave cooling forecast must be mastered.

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