As the weather gets hotter and hotter, typhoons often come. Some places are often visited by typhoons, causing huge human and material damage to these places. We are all on the same earth. Are there more typhoons in the northern hemisphere or in the southern hemisphere? After some research and observation, we found that there are more typhoons in the northern half than in the southern hemisphere. If we want to know accurately whether there are more typhoons in the Southern Hemisphere or the Northern Hemisphere, we must first understand how typhoons are formed. 1. Vast high-temperature ocean surface 2. Suitable flow field. 3. Appropriate geostrophic deflection force. 4. The vertical shear of the wind should be small.
Typhoons around the world mainly occur in 8 sea areas. Among them, the northern hemisphere has five sea areas: the western and eastern North Pacific, the western North Atlantic, the Bay of Bengal and the Arabian Sea, while the southern hemisphere has three sea areas: the western South Pacific, the western and eastern South Indian Ocean.
Typhoons in the Northern Hemisphere generally form on the south side of the subtropical high. For typhoons in the northwest Pacific, when the subtropical high is strong in summer and its western boundary extends to the eastern part of my country, the typhoon often lands in my country before it can turn around. , when the main body of the subtropical high pressure moves eastward or is weak, the typhoon will turn offshore.
There are also typhoons in the Southern Hemisphere, but the number is really very small. The main reason is that the land area in the Southern Hemisphere is relatively small and scattered. It lacks the high and low pressure centers formed by giants like Eurasia. Therefore There are fewer tropical cyclones in the Southern Hemisphere and they are smaller.
The rotation direction of typhoons in the southern hemisphere and the northern hemisphere is also different, because the geostrophic deflection force is due to the rotation of the earth, which causes moving objects on the earth's surface to experience a force perpendicular to its direction of motion. The full name is the deflection force of the earth's rotation. The geostrophic force does not change the speed (speed) of moving objects on the earth's surface, but it can change the direction of moving objects.