Meteorology · Barometer — Reduction
Before comparison or plotting, a barometer reading is corrected to:
- ALocal apparent time
- BTrue north
- CThe dew point
- DSea level (and for instrument/temperature error)✓ Correct
Explanation
Pressure is reduced to sea level (and corrected for instrument and temperature error) so readings from different heights/stations are comparable and isobars can be drawn meaningfully.
Authority: Bowditch (Pub. No. 9), the barometer
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