Discussion
Assertion (A): Potential temperature is conserved during dry adiabatic descent.
Reason (R): The definition of potential temperature removes the effect of adiabatic compression.
Select the correct answer from the options below.
Answer: C
The potential temperature is constructed by undoing the compression, bringing the parcel to a reference pressure, so it cannot be changed by that compression. The reason therefore explains the assertion by construction. The actual temperature rises at the dry adiabatic rate during the descent, which is the change the definition was designed to remove.
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