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Which principle has been proposed to constrain the climate state?

  • A.The equipartition of energy among the available degrees of freedom of the molecules within the atmosphere
  • B.Maximum entropy production
  • C.Minimum energy, which requires the atmosphere to adopt the configuration with the lowest potential energy possible
  • D.Conservation of entropy

Answer: B

Some authors have proposed that the climate system organises itself so as to maximise the rate of entropy production, which reproduces the observed poleward heat transport surprisingly well. The principle has no rigorous foundation and remains controversial. It is nonetheless an interesting example of an attempt to constrain a complex system by a variational argument rather than by solving its equations. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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