Discussion
Consider the following statements about omega.
1. It is negative for ascent.
2. It has units of pascals per second.
3. It can be measured directly by radiosonde.
Which of the statements given above is or are correct?
Answer: D
The first two statements are correct. Large-scale omega cannot be measured directly because the corresponding vertical velocity of about 1 centimetre per second lies far below observational accuracy, so it must be diagnosed from divergence or from the omega equation. A radiosonde measures its own ascent rate, which is governed by the balloon's buoyancy rather than by the motion of the air. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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