Discussion
Air at \( 22 \) degrees at the surface is measured at \( 14 \) degrees at \( 1000 \) m. The environmental lapse rate is
Answer: A
Correct answer: 8.0 degrees per km
The environmental lapse rate is the observed fall of temperature with height. Here the temperature falls from \( 22 \) degrees at the surface to \( 14 \) degrees at \( 1000 \) m:
\[ \Gamma = \frac{22 - 14}{1.0\ \text{km}} = 8.0\ \text{degrees per km} \]
The value \( 9.8 \) is the dry adiabatic rate, not the measured one, and \( 14 \) is simply the upper temperature. Since \( 8.0 \) is less than \( 9.8 \), this profile is subadiabatic and therefore stable.
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