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| Titel |
A single gas chromatograph for accurate atmospheric mixing ratio measurements of CO2, CH4, N2O, SF6 and CO |
| VerfasserIn |
S. Laan, R. E. M. Neubert, H. A. J. Meijer |
| 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 ; 2, no. 2 ; Nr. 2, no. 2 (2009-09-23), S.549-559 |
| Datensatznummer |
250000568
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| Publikation (Nr.) |
 copernicus.org/amt-2-549-2009.pdf |
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| Zusammenfassung |
We present an adapted gas chromatograph capable of measuring simultaneously
and semi-continuously the atmospheric mixing ratios of the greenhouse gases
CO2, CH4, N2O and SF6 and the trace gas CO with high
precision and long-term stability. The novelty of our design is that all
species are measured with only one device, making it a very cost-efficient
system. No time lags are introduced between the measured mixing ratios. The
system is designed to operate fully autonomously which makes it ideal for
measurements at remote and unmanned stations. Only a small amount of sample
air is needed, which makes this system also highly suitable for flask air
measurements. In principle, only two reference cylinders are needed for
daily operation and only one calibration per year against international WMO
standards is sufficient to obtain high measurement precision and accuracy.
The system described in this paper is in use since May 2006 at our
atmospheric measurement site Lutjewad near Groningen, The Netherlands at
6°21´ E, 53°24´N, 1 m a.s.l. Results show the long-term stability
of the system. Observed measurement precisions at our remote research
station Lutjewad were: ±0.04 ppm for CO2, ±0.8 ppb for
CH4, ±0.8 ppb for CO, ±0.3 ppb for N2O, and ±0.1 ppt
for SF6. The ambient mixing ratios of all measured species as
observed at station Lutjewad for the period of May 2007 to August 2008 are
presented as well. |
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