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Which value does the mixing ratio typically reach in saturated tropical air?

  • A.About 25 grams per kilogram
  • B.About 4 grams per kilogram, which is closer to the value found in saturated air at around zero degrees
  • C.About 100 grams per kilogram
  • D.About 1 gram per kilogram, which is characteristic of the very dry air found in the upper troposphere

Answer: A

Saturated air at 30 degrees and 1000 hectopascals holds about 27 grams per kilogram, and 25 is a good working figure for the humid tropics. At 0 degrees the saturated value is about 3.8 and at minus 20 it is under one. This steep dependence on temperature is the Clausius-Clapeyron relation expressed in the variable meteorologists actually use. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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