Discussion
Statement I: Divergence aloft favours falling surface pressure.
Statement II: Convergence aloft favours falling surface pressure.
In the light of the above statements, choose the correct answer.
Answer: B
Surface pressure measures the weight of the overlying column, so removing mass from the top lowers it while adding mass raises it. The second statement therefore reverses the relationship. Because the upper divergence and lower convergence nearly cancel in the vertical integral, the actual tendency is a small residual, which is why forecasting surface pressure directly proved so difficult historically.
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