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Which asymmetry produces the foehn warming?

  • A.Saturated ascent but dry adiabatic descent
  • B.Dry ascent on the windward side followed by saturated descent on the lee side of the barrier concerned
  • C.Equal rates on both sides
  • D.A greater rate of ascent on the windward slope than of descent on the lee side of the same mountain range

Answer: A

Air rising and condensing cools at about 5 kelvin per kilometre, but once the moisture has fallen out as precipitation the descending air warms at 9.8, so it arrives warmer and much drier. The temperature difference across a 3 kilometre barrier can exceed 10 kelvin. The precipitation on the windward side is essential to the mechanism.

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