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Which process can break down a valley cold pool?

  • A.Continued radiative cooling, which eventually makes the pool dense enough to drain out of the valley entirely
  • B.Light snowfall
  • C.The formation of fog within the pool, which absorbs solar radiation and warms the layer from within it
  • D.Strong synoptic wind or a foehn event

Answer: D

Only a substantial change in the synoptic flow, bringing strong wind or warm descending air aloft, can scour out a well established cold pool, and radiative processes alone tend to reinforce it. Fog makes matters worse by reflecting sunlight. Cold pools in deep basins have persisted for weeks in extreme cases.

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