Given an environmental lapse rate of 5°C/1000 m and a dry adiabatic of 10°C, what would be the temperature of unsaturated surface air after it rises to height of 2000 m if its surface temperature had been 25°C?
A) 20°C
B) 5°C
C) 10°C
D) 25°C
E) 15°C

Question

Quizplus · Accepted Answer

The dry adiabatic rate applies only to unsaturated air. The temperature of the unsaturated surface air after it rises to a height of 2000 m is found by subtracting two dry adiabatic rates (since it is unsaturated air) and one environmental lapse rate from the surface temperature: 
25°C - (2 x 10°C) - (1 x 5°C) = 0°C 
Therefore, the best choice is B, 5°C.

Given an Environmental Lapse Rate of 5°C/1000 M and a Dry