Discussion
Which component of the ageostrophic wind is driven by a changing pressure field?
Answer: D
Where the pressure field is falling rapidly, an isallobaric wind blows towards the region of greatest fall, which is why convergence develops ahead of a deepening low. The name comes from isallobars, contours of pressure tendency. The other components arise from acceleration, from friction and from curvature respectively, and separating them helps in attributing an observed cross-isobaric flow to its cause.
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