Methane
Atmospheric methane mixing ratios at Neumayer, measured on high-volume air samples by gas chromatography. The yellow line is the calculated trend and seasonal cycle through the data, the red line gives the annual growth rate in ppb/year, both calculated with a fitting routine of NOAA/CCGG [Thoning et al., J. Geophys. Res., 94 (D6), 8549-8565, 1989]. For further information contact Ingeborg Levin (Institut für Umweltphysik).
Carbon dioxide
Atmospheric carbon dioxide mixing ratios at Neumayer, measured on flask samples by gas chromatography. The red line is the calculated trend and seasonal cycle through the data, the blue line gives the annual growth rate in ppm/year, both calculated with a fitting routine of NOAA/CCGG [Thoning et al., J. Geophys. Res., 94 (D6), 8549-8565, 1989]. Below: delta-C-13(CO2) time series. The long-term trend is caused by isotopically depleted fossil fuel or biogenic CO2 emissions to the global atmosphere. For further information contact Ingeborg Levin (Institut für Umweltphysik).
