Discussion
Which fraction of total potential energy is available in the atmosphere?
Answer: B
Lorenz showed the available portion to be around 0.5 per cent of the total, because most of the mass is already near its lowest attainable arrangement. Even that small fraction is about ten times the kinetic energy of the general circulation, so it is more than sufficient to drive the observed weather. The calculation is a useful corrective to the intuition that a large reservoir must imply a large usable supply. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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