Why do tropical cyclones require at least 80 degrees ocean temperatures to form?

Question

its for my homework

Answer 1

The energy of a cyclone is derived from the latent heat of condensation of the ascending moist air.That means the air has to contain enough moisture.If the air has to contain enough moisture, the ascending air should be sufficiently warmer as it is a well known fact that warm air can hold more water vapour(moisture) than cold air.If the air has to be warm, the sea surface over which it lies should be suffiently warmer so that the addition of moisture into the air by evaporation from the sea surface is possible. It has been found out that the sea surface should be atleast 26.5 degrees celcius(80 degree fahreheit) for this to happen.
Finally you can say that cyclones initially gather heat and enegy through contact with warm ocean water only(even though the latent heat of condensation released subsequently at higher level help them to maintain the intensity).So the addition of moisture by evaporation from the sea surface powers them like a giant heat engine and for this to happen, the sea surface should be suffiently warmer.

Answer 2

I don't know about 80° but they do need a sea surface temperature in excess of 26°C. The warm water produces a lot of evaporation. A great deal of heat is needed to evaporate the water. The heat used to change the state from a liquid to a gas is called latent heat.

The water vapour rises in the unstable air and condenses to form cloud. Higher up, the water droplets freeze into ice crystals. The processes of condensation and freezing release the latent heat absorbed at the surface. It is the latent heat that fuels the tropical cyclone. Without the very warm water to start with, insufficient heat is lifted from the surface to higher in the troposphere to fuel the tropical cyclone.

Answer 3

They can form with water temperatures a bit cooler, but they need that warm water in order to have sufficient heat content in the adjacent air to develop. Tropical cyclones derive their energy from condensation of water vapor, and the warmer the waters, generally the more vapor content for "fuel".

Answer 4

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