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Which comparison holds between that term and wind dissipation?

  • A.They are of comparable magnitude
  • B.Precipitation dissipation is negligible, being smaller by several orders of magnitude than the wind term is
  • C.Precipitation dissipation is a thousand times larger
  • D.The two cannot be compared, since they involve entirely different forms of energy within the climate system

Answer: A

Estimates place the dissipation by falling precipitation at a few watts per square metre globally, comparable with or exceeding the dissipation of the wind. Both are small compared with the radiative terms but they dominate the mechanical energy budget. Recognising the comparability is a useful corrective to the assumption that the wind is the only significant mechanical dissipation. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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