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Match each microphysical process with its meaning.
List I
A. Autoconversion
B. Accretion
C. Self collection
D. Breakup
List II
1. drops of similar size merging together
2. cloud droplets combining into drizzle drops
3. a large drop fragmenting into smaller ones
4. a drizzle drop collecting cloud droplets

  • A.A-2, B-4, C-3, D-1
  • B.A-3, B-1, C-4, D-2
  • C.A-2, B-4, C-1, D-3
  • D.A-4, B-2, C-1, D-3

Answer: C

Bulk microphysics schemes represent warm rain through terms of exactly this kind. Autoconversion is the slowest and most uncertain of them, and models differ considerably in how they parameterise it. The other three terms are comparatively well constrained.

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