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All of the following contribute to a convective downdraught EXCEPT

  • A.warming of the air as water vapour condenses
  • B.evaporative cooling of the descending air
  • C.the weight of the precipitation carried down
  • D.melting of ice particles absorbing latent heat

Answer: A

Condensation warms the air and drives updraughts rather than downdraughts. The other three each make the descending air denser than its surroundings. Density contrast is what drives any downdraught. Buoyancy works the same way downward as it does upward.

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