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The Marshall Palmer distribution describes

  • A.the size distribution of condensation nuclei
  • B.an exponential fit to the raindrop size spectrum
  • C.the vertical profile of cloud liquid water
  • D.the growth rate of a drop by condensation

Answer: B

Correct answer: an exponential fit to the raindrop size spectrum

Marshall and Palmer found the number of drops falling off exponentially with diameter, with a slope depending on the rainfall rate. It is an empirical fit rather than a derivation, and it remains the standard reference distribution for radar work and for anything requiring an assumed drop spectrum.

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