Evaluation and comparison of atmospheric CO2 concentrations from models and satellite retrievals

In recent years, global warming caused by increased atmospheric CO₂ has greatly drawn widespread attention from the public. Although satellite observations and model-simulation offer us two effective approaches to monitor and assess the global atmospheric CO₂, quantification of the differences between these two different CO₂ data is not fully investigated yet. In this paper, these CO₂ products including satellite observations and model-simulation are inter-compared in terms of magnitude and their spatiotemporal distributions. The results reveal that these CO₂ data from different data source show a good agreement all over the world, whereas many discrepancies still exist between satellite observations and model-simulation, especially in the Northern Sphere.