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Two soundings taken a thousand kilometres apart show identical wet bulb potential temperature at 850 hectopascals.

What may be concluded?

  • A.The two stations lie within the same air mass
  • B.The two stations have the same surface temperature, since the quantity is derived from that measurement alone
  • C.Nothing may be concluded
  • D.A front must lie between them, since air masses of identical properties cannot exist over such a distance

Answer: A

A conserved air mass label taking the same value at two places indicates that the air has a common origin and has undergone similar processing, which is what defines a single air mass. Surface temperature may differ considerably because of local heating and elevation. A front would appear as a sharp gradient between the two rather than as identical values.

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