Discussion
Which behaviour does potential temperature show with height in a stable atmosphere?
Answer: C
Static stability requires potential temperature to increase with height, so that a parcel displaced upward finds itself cooler and denser than its surroundings and returns. Constant potential temperature indicates neutral stratification and a decrease indicates instability. This single criterion replaces the more cumbersome comparison of lapse rates and is the reason potential temperature is so central to the subject. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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