Discussion
Which structure accompanies a surface front in the vertical?
Answer: D
A frontal zone slopes upward over the cold air with a gradient of about one in a hundred, and the thermal wind requires a corresponding zone of concentrated shear along that slope. The slope follows from the Margules relation between the temperature contrast and the wind change across the front. A vertical discontinuity would be dynamically impossible, since it would imply infinite shear and immediate instability. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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