Buschmann, M., N.M. Deutscher, M. Palm, T. Warneke, C. Weinzierl, and J. Notholt, 2017: The arctic seasonal cycle of total column CO2 and CH4 from ground-based solar and lunar FTIR absorption spectrometry, Atmos. Meas. Tech., 10, 2397-2411, doi:10.5194/amt-10-2397-2017