Discussion
Which structure appears on an isentropic surface crossing the tropopause?
Answer: C
The surface passes from the troposphere at low latitudes to the stratosphere at high latitudes, and the potential vorticity jumps by an order of magnitude across the crossing. That sharp gradient is the dynamical tropopause seen in plan view, and the distortions of the contour reveal the waves and the wave breaking. It is one of the most informative single fields in synoptic meteorology. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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