Trends in CO₂, CH₄, N₂O, SF₆

Recent Global CO₂ Trend

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The figure shows daily averaged CO₂ from four GML Atmospheric Baseline observatories; Barrow, Alaska (in blue), Mauna Loa, Hawaii (in red), American Samoa (in green), and South Pole, Antarctica (in yellow). The thick black lines represent the average of the smoothed seasonal curves and the smoothed, de-seasonalized curves for each of the records. These lines are a very good estimate of the global average levels of CO₂. Details about how the smoothed seasonal cycle and trend are calculated from the daily data are available here.