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Tropospheric column-averaged CH4 mole fractions were derived fromground-based column absorption measurements. The method uses stratosphericN2O columns to correct for the stratospheric contribution to theCH4 total column. The method was applied to four Total Carbon Column Observing Network (TCCON) sites coveringlocations from the Northern Arctic to the tropics. It performs well for allsites. The derived tropospheric CH4 concentrations were compared withprofiles measured by aircraft at three sites. The results indicate aninter-site consistency within 6 ppb (~0.3%). With aircraftprofiles up to 3 km, the seasonal behavior of the derived troposphericCH4 concentration was also checked, revealing a difference of around20 ppb. The mean relative uncertainty of the four sites, as estimated from thedaily standard deviations, is 0.23%

atmospheric measurement techniques

Retrieval of tropospheric column-averaged CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; mole fraction by solar absorption FTIR-spectrometry using N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O as a proxy