Design and Performance of a Nafion Dryer for Continuous Operation at CO2 and CH4 Air Monitoring Sites
In preparation for the routine deployment of the Earth Networks greenhouse gas monitoring network, we have designed and tested a simple method for drying ambient airto below 0.2 % mole fraction H2O using a Nafion dryer. The inlet was designed for usewith a Picarro model G2301 cavity ring down spectrometer (CRDS) CO2/CH45 /H2O analyzer. The analyzer measures water vapor mixing ratio at the same frequency as CO2and CH4 and then corrects for the dilution and peak broadening effects of H2O on theCO2 and CH4 mixing ratios.