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A disdrometer measures

  • A.the total depth of water accumulated over an hour
  • B.the radar reflectivity of a distant storm
  • C.how deep the melting layer extends beneath the cloud
  • D.the sizes and fall speeds of individual hydrometeors

Answer: D

Correct answer: the sizes and fall speeds of individual hydrometeors

A disdrometer records each particle that passes through its sampling volume, giving the drop size distribution directly rather than only the accumulated depth a rain gauge provides. That distribution is what a radar rainfall relationship has to assume, so disdrometers are used to derive and validate those relationships and to distinguish rain from drizzle, snow and hail.

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