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We present an adapted gas chromatograph capable of measuring simultaneouslyand semi-continuously the atmospheric mixing ratios of the greenhouse gasesCO2, CH4, N2O and SF6 and the trace gas CO with highprecision and long-term stability. The novelty of our design is that allspecies are measured with only one device, making it a very cost-efficientsystem. No time lags are introduced between the measured mixing ratios. Thesystem is designed to operate fully autonomously which makes it ideal formeasurements at remote and unmanned stations. Only a small amount of sampleair is needed, which makes this system also highly suitable for flask airmeasurements. In principle, only two reference cylinders are needed fordaily operation and only one calibration per year against international WMOstandards is sufficient to obtain high measurement precision and accuracy. The system described in this paper is in use since May 2006 at ouratmospheric measurement site Lutjewad near Groningen, The Netherlands at6°21´ E, 53°24´N, 1 m a.s.l. Results show the long-term stabilityof the system. Observed measurement precisions at our remote researchstation Lutjewad were: ±0.04 ppm for CO2, ±0.8 ppb forCH4, ±0.8 ppb for CO, ±0.3 ppb for N2O, and ±0.1 pptfor SF6. The ambient mixing ratios of all measured species asobserved at station Lutjewad for the period of May 2007 to August 2008 arepresented as well

atmospheric measurement techniques

A single gas chromatograph for accurate atmospheric mixing ratio measurements of CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;, CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;, N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O, SF&amp;lt;sub&amp;gt;6&amp;lt;/sub&amp;gt; and CO