A high precision manometric system for absolute calibrations of CO 2 in dry air

A high‐precision manometric system has been developed for absolute calibrations of CO 2 ‐in‐air mixture gas. This report describes the principle of the calibration method and evaluates the performance of the manometric apparatus. The test results show that the reproducibility of the manometric syste...

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Bibliographic Details
Published in:Journal of Geophysical Research: Atmospheres 1997-03, Vol.102 (D5), p.5885-5894
Main Authors: Zhao, Cong Long, Tans, Pieter P., Thoning, Kirk W.
Format: Article
Language:English
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Summary:A high‐precision manometric system has been developed for absolute calibrations of CO 2 ‐in‐air mixture gas. This report describes the principle of the calibration method and evaluates the performance of the manometric apparatus. The test results show that the reproducibility of the manometric system for calibrating CO 2 ‐in‐air gas mixtures is within ±0.1 μmol mol −1 in the atmospheric CO 2 concentration range of 300 to 400 μmol mol −1 . Preliminary measurements indicate that the agreement with the absolute World Meteorological Organization mole fraction scale, widely used for atmospheric CO 2 monitoring, is also within ±0.1 μmol mol −1 in that same range.
ISSN:0148-0227
DOI:10.1029/96JD03764