Discussion
Assertion (A): Omega is positive for ascending motion.
Reason (R): Omega is the material rate of change of pressure following the parcel.
Select the correct answer from the options below.
Answer: D
The reason gives the correct definition, and because pressure decreases upward that definition makes omega negative for ascent, so the assertion is false. The inverted sign is a frequent source of error when reading model output. Deriving the sign from the definition each time is far more reliable than trying to remember which way round the convention runs.
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