Which of the following best describes conditions in a stable atmosphere?Question 6Select one:a. A parcel of air is lifted in response to surface heating and continues to rise until it reaches the lifting condensation level.b.A lifted parcel of air will rise indefinitely at a constant lapse rate.c.A parcel of air that is lifted adiabatically will return to its original position through adiabatic cooling.d.An unsaturated parcel will rise at the dry adiabatic lapse rate until it reaches the lifting condensation level where it continues to rise at the saturated adiabatic lapse rate.
Question
Which of the following best describes conditions in a stable atmosphere?Question 6Select one:a. A parcel of air is lifted in response to surface heating and continues to rise until it reaches the lifting condensation level.b.A lifted parcel of air will rise indefinitely at a constant lapse rate.c.A parcel of air that is lifted adiabatically will return to its original position through adiabatic cooling.d.An unsaturated parcel will rise at the dry adiabatic lapse rate until it reaches the lifting condensation level where it continues to rise at the saturated adiabatic lapse rate.
Solution
The best description of conditions in a stable atmosphere is option c: A parcel of air that is lifted adiabatically will return to its original position through adiabatic cooling.
Here's why:
In a stable atmosphere, the temperature of the environment decreases slower with height than the temperature of a rising air parcel. This means that as the air parcel rises and cools, it will eventually become cooler than the surrounding air. Because cooler air is denser, the air parcel will stop rising and return to its original position. This process is known as adiabatic cooling.
The other options do not accurately describe a stable atmosphere. Options a, b, and d describe conditions in an unstable or conditionally unstable atmosphere, where lifted air parcels continue to rise because they remain warmer (and therefore less dense) than their surroundings.
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