A high precision manometric system for absolute calibrations of CO2 in dry air

A high‐precision manometric system has been developed for absolute calibrations of CO2‐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...

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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
Subjects:
Earth, ocean, space
Exact sciences and technology
External geophysics
Geophysics. Techniques, methods, instrumentation and models
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Summary:A high‐precision manometric system has been developed for absolute calibrations of CO2‐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 CO2‐in‐air gas mixtures is within ±0.1 μmol mol−1 in the atmospheric CO2 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 CO2 monitoring, is also within ±0.1 μmol mol−1 in that same range.
ISSN:0148-0227
2156-2202
DOI:10.1029/96JD03764