How is a typhoon formed? What is the principle of typhoon formation?

A typhoon is a tropical cyclone. Typhoon originates from tropical sea surface, where the temperature is high, and a large amount of seawater evaporates into the air, forming a low pressure center. With the change of air pressure and the movement of the earth itself, the inflow of air also rotates, forming a counterclockwise air vortex, which is a tropical cyclone. As long as the temperature does not drop, this tropical cyclone will get stronger and stronger, and finally a typhoon will form. Because of the temperature difference between land and sea, landing will cause great damage.

First, the typhoon introduction:

Typhoon, also known as hurricane. It is a tropical cyclone formed on the vast sea surface with tropical or subtropical sea surface temperature above 26℃. Meteorology, according to the definition of the World Meteorological Organization, the tropical cyclone center with sustained wind speed of 12 to 13 (i.e. 32.7m to 41.4m per second) is called typhoon or hurricane, and the name of hurricane is used in the North Atlantic and the East Pacific. In the western part of the North Pacific (north of the equator, west of international date line, east of E 100), it is synonymous with typhoon. Every summer and autumn, many violent storms called typhoons will be generated in the northwest Pacific Ocean adjacent to China. Some of these storms will dissipate in the ocean, while others will land, bringing violent storms.

The life history of tropical cyclones can be divided into three stages: generation, maturity and extinction. Its average life span is about a week, the shortest is only 2-3 days, and the longest is about a month.

The generation and development of tropical cyclones need huge energy, so they are formed on the tropical ocean surface with suitable meteorological conditions such as high temperature and high humidity. According to statistics, tropical cyclones are generated in tropical oceans all over the world except the southeast Pacific Ocean.

It is usually formed on the sea surface 3-5 latitudes away from the equator in tropical areas (such as the North and South Pacific, the North Atlantic and the Indian Ocean), and its movement is mainly affected by large-scale weather systems, and eventually dissipates at sea, or degenerates into an extratropical cyclone, or dissipates after landing. Tropical cyclones landing on land will bring serious property and casualties, which is a natural disaster. However, tropical cyclones are also part of the atmospheric circulation, which can bring the thermal energy and angular momentum of the earth's rotation from the equatorial region to a higher latitude.

Second, the classification:

Tropical depression with maximum wind speed of 6-7, (10.8- 17. 1 m/s);

Tropical storm with maximum wind speed of 8-9 (17.2-24.4m/s);

Strong tropical storm, maximum wind speed 10 ~ 1 1, (24.5 ~ 32.6m/s);

Typhoon (typhoon), maximum wind speed 12 ~ 13, (32.7m/s ~ 41.4m/s);

Strong typhoon with maximum wind speed14 ~15 (41.5m/s ~ 50.9m/s);

Super typhoon with maximum wind speed ≥ 16 (≥5 1.0m/s).

Third, the formation of the typhoon:

Typhoon is caused by high ground temperature and rising airflow. Because of the high ratio of wind to water vapor on the sea surface, the ground air is replenished along the ground, while the sea surface temperature is low, and the rising air and water vapor are absorbed to replenish the space. Because of the large sea surface and small temperature difference, there is a lot of water vapor accumulated over the sea surface and a wide range of rainfall. When water vapor condenses, its volume decreases, which supplements the surrounding water vapor and forms a strong wind.