- the total amount of energy released by the condensation of water droplets or ...
- the amount of kinetic energy generated to maintain the strong swirling winds of the hurricane (Emanuel 1999).
An average hurricane produces 1.5 cm/day (0.6 inches/day) of rain inside a circle of radius 665 km (360 n.mi) (Gray 1981). (More rain falls in the inner portion of hurricane around the eyewall, less in the outer rainbands.) Converting this to a volume of rain gives 2.1 x 1016 cm3/day. A cubic cm of rain weighs 1 gm. Using the latent heat of condensation, this amount of rain produced gives5.2 x 1019 Joules/day or 6.0 x 1014 Watts.This is equivalent to 200 times the world-wide electrical generating capacity - an incredible amount of energy produced!
- Method 1) - Total energy released through cloud/rain formation:
For a mature hurricane, the amount of kinetic energy generated is equal to that being dissipated due to friction. The dissipation rate per unit area is air density times the drag coefficient times the windspeed cubed (See Emanuel 1999 for details). One could either integrate a typical wind profile over a range of radii from the hurricane's center to the outer radius encompassing the storm, or assume an average windspeed for the inner core of the hurricane. Doing the latter and using 40 m/s (90 mph) winds on a scale of radius 60 km (40 n.mi.), one gets a wind dissipation rate (wind generation rate) of1.3 x 1017 Joules/day or
- Method 2) - Total kinetic energy (wind energy) generated:
1.5 x 1012Watts.This is equivalent to about half the world-wide electrical generating capacity - also an amazing amount of energy being produced!Either method is an enormous amount energy being generated by hurricanes. However, one can see that the amount of energy released in a hurricane (by creating clouds/rain) that actually goes to maintaining the hurricane's spiralling winds is a huge ratio of 400 to 1.