Retrieval of tropospheric column-averaged CH<sub>4</sub> mole fraction by solar absorption FTIR-spectrometry using N<sub>2</sub>O as a proxy
Author:
Wang Z., Deutscher N. M.ORCID, Warneke T., Notholt J., Dils B., Griffith D. W. T.ORCID, Schmidt M., Ramonet M., Gerbig C.ORCID
Abstract
Abstract. Tropospheric column-averaged CH4 mole fractions were derived from ground-based absorption columns measurements. The method used stratospheric N2O columns to correct for the stratospheric contribution to the CH4 total column. The method was applied to four TCCON sites covering locations from the Northern Arctic to the tropics. It performs well for all sites. The derived tropospheric CH4 concentrations were compared with profiles measured by aircraft at three sites. The results indicate an inter-site consistency within 6 ppb (~ 0.3%). With aircraft profiles up to 3 km, the seasonal behavior of the derived tropospheric CH4 concentration was also checked. It reveals a difference of 20 ppb around. The mean relative uncertainty of the four sites is 0.23%. Comparing with the method using HF the proposed method shows a smaller relative uncertainty and less H2O dependence.
Publisher
Copernicus GmbH
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