Atmospheric Greenhouse Gas Mole Fractions of CH4 collected by the ICOS ATC, covering the period 1984-2024, including final quality-controlled Level 2 ICOS data, release 2022-1 and NRT data up to 1 February 2024. During the most recent period, a selected set of stations, after being labelled as ICOS stations, observations follow the ICOS Atmospheric Station specification V2.0. Measurements and data processing for all time series is described in Ramonet et al., 2020. All concentrations are calibrated to the WMO CH4 X2004A mole fraction scale in mole/mole.
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