This study presents continuous atmospheric CO2 and δ13C measurements by wavelength-scanned cavity ring down spectroscopy (Picarro G1101-i) at the high-mountain station Schneefernerhaus, Germany. δ13C values were post-corrected for methane and water spectral interferences using accompanying measurements of CH4, H2O as well as CO2 in dried air, respectively. The best precision of ± 0.2 ‰ for δ13C and ± 4 ppb for CO2 was obtained with an integration time of about 1 hour for δ13C and 2 hours for CO2. The seasonality of CO2 and δ13C was studied by fitting background curves for a complete 2-year period. Peak-to-peak amplitudes of the averaged seasonal cycle were 15.5 ± 0.15 ppm for CO2 and 1.97 ± 0.53 ‰ for δ13C, respectively. Based on the HYSPLIT model, air masses were classified into five clusters, with westerly and northeasterly flows being the most and the least frequent, respectively. In the wintertime, Northwest and Northeast clusters had the higher median level of ΔCO2 and the lower median level Δδ13C (difference between observed and background concentrations), likely caused by anthropogenic emissions. In the summertime, air masses from Northwest had the lowest ΔCO2 and the highest Δδ13C. Potential source contribution functions (PSCF) were used to identify the potential source and sink areas. In winter, source areas for high CO2 mixing ratios (> 75th percentile) were mainly located in northwestern Europe. In summer, areas with high δ13C ratios (> 75th percentile), indicating a carbon sink, were observed in air from Eastern and Central Poland.