FIG. 5. Results of a diurnal cycle, taken by the autosampler at the monitoring station at Lutjewad (NL). The air was sucked in from a 60-m height. (a) Mixing ratios of CO2, CH4, and CO and (b) dO2/ N2 and results of the 14C analysis of CO2. (c) The relation between CO and the amount of fossil-fuel-derived CO2. The regression line derived by using only the samples marked by fully open symbols is shown to guide the eye.
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