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The Z-R relationship links

  • A.temperature to saturation vapour pressure
  • B.radar reflectivity to rainfall rate
  • C.cloud depth to precipitation efficiency
  • D.drop size to terminal velocity

Answer: B

It is an empirical power law whose coefficients depend on the precipitation type. Using an inappropriate pair of coefficients can produce errors of a factor of two or more in the estimated rainfall. Operational radars therefore switch coefficients by echo type.

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