What are low-altitude convergence and high-altitude divergence?

Divergence refers to the backward movement of horizontal air, and convergence refers to the opposite movement of horizontal air. The picture below reflects the emergence of a low-pressure weather system on the ground. Rising air appears in the vertical direction of the low-pressure center, while ground convergence and high-altitude divergence occur in the horizontal direction. Generally speaking, this is a geographical term describing a cyclone. Cyclone: ​​refers to a large vortex in the northern (southern) hemisphere where the horizontal airflow in the atmosphere rotates counterclockwise (clockwise). At the same height, the air pressure at the center of a cyclone is lower than that around it. In the northern hemisphere, the air moves counterclockwise. The central air pressure is the lowest and gradually increases outward. The air continues to flow into the center, forming an updraft. At the same time, due to the influence of the horizontal air pressure gradient force, the air flow flows from high pressure to low pressure. Therefore, in a cyclone On the vertical plane, the low-altitude airflow converges toward the center, and the airflow begins to diverge after flowing to high altitude. In the Northern Hemisphere, cyclonic airflows move counterclockwise from low altitude to high altitude, while in the Southern Hemisphere, cyclones move clockwise from low altitude to high altitude. The weather conditions of the cyclone: ​​rainy weather. In the Northern Hemisphere, anticyclonic airflow moves clockwise from high altitude to low altitude, while in the Southern Hemisphere, anticyclonic airflow moves counterclockwise from high altitude to low altitude. Anticyclonic weather conditions: Sunny.