Is the cold wave cold front or anticyclone? What are the meteorological characteristics of the cold wave?

Lead: There are many types of anticyclones, which can be divided into different cyclones according to different methods. Some friends are interested in the related content of the cold wave. So, do you know whether the cold wave is a cold front or an anticyclone? What are the meteorological characteristics of the cold wave? Let's have a look.

Is the cold wave a cold front or an anticyclone

The cold wave is both a cold front and an anticyclone. The cold wave is caused by a cold front, but it is actually caused by an anticyclone. The cold wave is actually a strong cold air, and its main body is the anticyclone cold high pressure. The junction between the cold high pressure and the warm air in front is the cold front, which is the front of the cold high pressure. Therefore, the cold front is a manifestation of the southward cold high pressure, so the cold wave is actually caused by an anticyclone.

Cold wave: large-scale intense cold air activity. The cold wave that hit China came from the cold and high pressure activities in Eurasia. So the cold wave is an anticyclone.

Cold front: the front where cold air moves towards warm air. In winter, the strong cold and high pressure formed in Mongolia and Siberia often moves south and enters China, forming a cold wave. At this time, the cold air moves in the direction of warm air. So the cold wave is a cold front.

Cold wave is a weather phenomenon, and it is also a disastrous weather phenomenon. Anti-cyclone and cold front belong to weather system. If we must link the two, we can say that the cold wave is both an anticyclone and a cold front.

It can also be added that the vast area where the cold wave passes belongs to anticyclone, and the leading edge of the cold wave south (northern hemisphere) belongs to cold front.

Meteorological characteristics of anticyclone

Anti-cyclone, also called high pressure. Cyclone and anticyclone are two aspects of a system. Anti-cyclone is a horizontal air vortex with three-dimensional space, and the central air pressure is higher than that around it, which is also called high pressure. The names of cyclone and anticyclone come from the large airflow field, and the names of high pressure and low pressure come from the pressure field. The size of cyclone and anticyclone is measured by the range of the outermost closed isobar on the ground map. The horizontal scale of a cyclone is generally 1000km, the largest can reach 2000-3000km, and the smallest is only 200-300 km. The horizontal scale of anticyclone is generally much larger than that of cyclone. When it is strong, it can reach several Qian Qian meters. The intensity of cyclone and anticyclone is expressed by the central pressure value. The lower the air pressure in the cyclone center, the greater the intensity. The higher the air pressure in the anticyclone center, the greater the intensity.

Generally, the air pressure at the center of surface cyclone is10/0-970 hectopascals, which is lower than 935 hectopascals in strong development and as low as 920 hectopascals in the ocean. Generally, the air pressure at the center of the surface anticyclone is 1020- 1030 hectopascals, and the strong anticyclone can reach 1079. 1 hectopascals. In the northern hemisphere, the air in cyclone rotates counterclockwise around the center, and the air in anticyclone rotates clockwise around the center. In the southern hemisphere, the airflow is the opposite.

Cyclones are divided into temperate cyclones and tropical cyclones according to the occurrence area, and anticyclones are divided into polar anticyclones, temperate anticyclones and subtropical anticyclones. Cyclone and anticyclone are two important weather systems that cause weather changes. Temperate cyclones and anticyclones occur in middle and high latitudes, accompanied by high-altitude front areas. Their occurrence, development and movement are closely related to the upper-air weather system.

In the low-pressure atmosphere, especially near the ground, because the anticyclone airflow flows outward from the center. Therefore, there must be downward airflow in the center of the anticyclone to supplement the air flowing around. Otherwise, anticyclone cannot exist and develop. Therefore, the existence and development of anticyclone must have a complete circulation system which is closely combined with vertical movement and horizontal movement. Because the center of anticyclone is downdraft, it is not conducive to the formation of clouds and rain. Therefore, the weather under the control of anticyclone is generally clear and cloudless. If it is in summer, the weather is hot and dry. If the anticyclone is stable and inactive for a long time, drought will often occur.

Anti-cyclone is a large-scale air vortex occupying three-dimensional space. In the northern hemisphere, the airflow in the anticyclone area rotates clockwise from the center to the outside and counterclockwise in the southern hemisphere. The near-surface airflow of anticyclone radiates from the center to the periphery in the horizontal direction, and the air supplements from top to bottom in the vertical direction. The temperature of air rises in the process of sinking, and water vapor is not easy to condense. The windless weather and the obvious inversion layer controlled by anticyclone are also not conducive to the diffusion of pollutants in the atmosphere.