Discussion
Consider the following pairs of term and its definition:
Mixing height - Depth through which pollutants disperse readily
Ventilation coefficient - Mixing height times mean wind speed
Environmental lapse rate - Actual temperature change with height
Dry adiabatic lapse rate - Actual temperature change with height
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are right. The mixing height is the depth through which pollutants disperse readily; the ventilation coefficient is the mixing height times the mean wind speed; and the environmental lapse rate is the actual measured change of temperature with height.
The fourth is wrong. The dry adiabatic lapse rate is not an observed profile at all but a theoretical rate - about \( 9.8 \) degrees per kilometre - at which an unsaturated parcel cools as it rises and expands. It is the yardstick against which the environmental rate is compared to judge stability, so defining both as the actual change makes the comparison meaningless.
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