Discussion
Which pressure level is conventionally used to represent the mid-troposphere?
Answer: C
The 500 hectopascal surface lies at about 5.5 kilometres, with half the mass of the atmosphere below it, which makes it the natural single level to represent the steering flow. The 850 level is used for low level thermal advection, 250 or 300 for the jet stream and 1000 for surface conditions. The special status of 500 follows directly from hydrostatic balance and is worth understanding rather than merely accepting, since it explains why so much synoptic reasoning is conducted at that one level.
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