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Quasi-continuous measurements of methane (CH4) in atmospheric air. Measurements are made using a modified commercial Gas Chromatograph (Clarus 500, Perkin Elmer) equipped with a Flame Ionisation Detector (FID). Samples are analysed every ten minutes and with reference to the NOAA2004 calibration scale.

Data files containing the CH4 data are submitted on a monthly basis to BADC using the NASA AMES variable naming convention.