Answer briefly which weather systems produce ascending motion.

Cyclone and anticyclone are two basic weather systems. Just like the large and small eddies in rivers, there are also various eddies in the atmosphere, which rotate with the mainstream. In the northern hemisphere, a large air vortex in which air rotates counterclockwise around the center is called a cyclone. A large air vortex in which air rotates clockwise around the center is called an anticyclone. In the southern hemisphere, on the contrary, the cyclone rotates clockwise and the anticyclone rotates counterclockwise. In the westerly belt, cyclones and anticyclones move from west to east with the basic airflow; In the easterly belt, cyclones and anticyclones move from east to west with the basic airflow. Convergent updraft overwhelms cyclone and radiation overwhelms anticyclone. Downward cyclone and anticyclone are both large-scale weather systems with wide influence. The cyclone diameter is generally 1000 km, ranging from 200-300 km to 2000-3000 km. The largest range can be compared with the mainland and the ocean. The formation and movement of cyclones and anticyclones have great influence on the weather in vast areas. It is an important content of weather forecast to analyze and predict the occurrence, development, movement and change of cyclones and anticyclones. In the cyclone area, the airflow converges from the outside to the inside, and with the rise of water vapor in the surface air layer, it cools and condenses at high altitude, forming clouds and rain. Therefore, the weather in cyclone areas is generally rainy. The airflow diverges from the inside out, mainly downward airflow, usually sunny. Because China is located in the mid-latitude area, cyclone and anticyclone activities are quite frequent. Many severe weather changes in Chinese mainland are mainly caused by cyclones and anticyclones. For example, in winter, the weather in the Mongolian Plateau in the north of China is very cold, often forming an anticyclone high pressure center. Once this cold anticyclone goes south, it will bring a strong cold wave to the vast areas of China and seriously affect the weather in China. Another example is the typhoon.