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Two soundings 300 kilometres apart on an east-west line show identical winds at every level.

What can be concluded about the temperature field?

  • A.There is no north-south temperature gradient between them
  • B.The two stations must have the same surface temperature at the time the soundings were taken
  • C.The layer is dry
  • D.The stations lie on opposite sides of a front whose temperature contrast has cancelled in the mean

Answer: A

Identical wind profiles imply identical thermal winds, and since the thermal wind gives the temperature gradient, the gradient must be the same at both, which for the simplest interpretation means it is zero across the region. Absolute surface temperatures are not determined, humidity is unrelated, and a front between the stations would produce very different shears rather than identical ones.

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