Concentrations of CH4, CO, CO2, H2,H2O and N2O in Upper Stratosphere

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Abstract
On 23 May 1973 a cryogenic air sampler was flown on an Aerobee rocket from White Sands Missile Range. A large air sample was collected between 40 and 50 km altitude and successfully recovered for water vapor and trace gas analysis. The results were as follows: water vapor, 4.0+1.3−0.9 ppmV; methane, 0.37±0.01 ppmV; molecular hydrogen, 0.47±0.02 ppmV; carbon monoxide, 0.05±0.01ppmV; carbon dioxide, 316.2±2.8 ppmV; and nitrous oxide, 3±7ppb.