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| Titel |
Towards a stable and absolute atmospheric carbon dioxide instrument using spectroscopic null method |
| VerfasserIn |
B. Xiang, D. D. Nelson, J. B. McManus, M. S. Zahniser, S. C. Wofsy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 7 ; Nr. 6, no. 7 (2013-07-05), S.1611-1621 |
| Datensatznummer |
250017915
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| Publikation (Nr.) |
 copernicus.org/amt-6-1611-2013.pdf |
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| Zusammenfassung |
| We present a novel spectral method to measure atmospheric carbon dioxide
(CO2) with high precision and stability without resorting to
calibration tanks during long-term operation. This spectral null method
improves precision by reducing spectral proportional noise associated with
laser emission instabilities. We employ sealed quartz cells with known
CO2 column densities to serve as the permanent internal references in
the null method, which improve the instrument's stability and accuracy. A
prototype instrument – ABsolute Carbon dioxide (ABC) is
developed using this new approach. The instrument has a one-second precision
of 0.02 ppm, which averages down to 0.007 ppm within one minute. Long-term
stability of within 0.1 ppm is achieved without any calibrations for over a
one-month period. These results have the potential for eliminating the need
for calibration cylinders for high accuracy field measurements of carbon
dioxide. |
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