The cause of typhoon parrot.

Tropical storm is a kind of tropical cyclone, which refers to a tropical cyclone with a maximum wind force of 8-9 (17.2-24.4m/s). Basic conditions of production:

1 First of all, there must be a wide enough tropical ocean surface, which not only requires the surface temperature of seawater to be higher than 26℃

Form a layer of seawater with a depth of 0.5℃ and 60 meters.

Indoor, the water temperature should exceed this value. Among them, the vast ocean surface is the necessary natural environment for the formation of typhoons. Because of the friction between air molecules in typhoon, the daily average energy consumption is 365,438+000-4,000 calories/cm2. This huge energy can only be supplied by the latent heat released by the vast tropical ocean. In addition, the strong winds rotating around tropical cyclones will make the sea water churn around the center, and even swell up at the typhoon center where the air pressure drops very low, and then spread around, so the sea water will churn around from the typhoon center. In a typhoon, this sea churning phenomenon can affect the depth of 60 meters. On the ocean surface where the seawater temperature is lower than 26.5℃, it is difficult to maintain a typhoon due to insufficient heat energy. In order to ensure that the sea surface temperature is always above 26.5℃ during this tumbling process, this warm water layer must have a thickness of about 60 meters.

2. There must be a weak tropical vortex before the typhoon is formed. We know that the operation of any machine consumes energy, which requires energy. Typhoon is also a "heat engine". It rotates there at such a huge scale and speed and consumes a lot of energy, so it needs an energy source. The typhoon's energy comes from the water vapor in the tropical ocean. In a pre-existing tropical vortex, the air pressure in the vortex is lower than that around it, and the air around it carries a lot of water vapor to the center of the vortex, causing upward movement in the vortex area; Wet air rises and water vapor condenses, releasing huge latent heat of condensation, which can make typhoons run. Therefore, even if there is a tropical ocean surface with high temperature and high humidity to supply water vapor, it is impossible to form a typhoon without the process of intense rise of air and the release of latent heat by condensation. Therefore, the upward movement of air is an important factor to produce and maintain typhoons. But the necessary condition is that a weak tropical vortex exists first.

3. There should be enough earth rotation deviation, because the equatorial geostrophic deviation is zero, but two.

It increases extremely gradually, so the typhoon is located about 5 latitudes from the equator. Due to the rotation of the earth, a force that changes the direction of air flow is generated, which is called "Earth rotation bias force". On the rotating earth, the rotation of the earth makes it difficult for the surrounding air to flow directly into the low pressure, but rotates counterclockwise along the center of the low pressure (in the northern hemisphere).

4. Above weak low pressure, there is little difference between high and low air direction and wind speed. In this case, the upper and lower air columns work together, and the high-altitude heat is easy to accumulate, thus heating up. Once the cyclone is generated, the ambient airflow above the friction layer will flow along the isobar, and the warming effect of the upper layer can be further completed. In the area north of 20 n, the climatic conditions have changed, mainly because the high-rise wind is very strong, which is not conducive to warming, and typhoons are not easy to appear.

5. Tropical storms continue to strengthen and form typhoons.