Discussion
Which reduction allows barometer readings from different stations to be compared?
Answer: B
Station pressure is converted to the value that would be observed at mean sea level using the hypsometric relation and an assumed temperature for the fictitious column below. Without this step altitude would dominate the pattern entirely and no synoptic analysis would be possible. The assumption about the fictitious column is the weak point, and it introduces appreciable error at high elevation stations. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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