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. Passive remote sensing of atmospheric carbon dioxide uses spectroscopic measurements of sunlight backscattered by the Earth's surface and atmosphere. The current state-of-the-art retrieval methods use three different spectral bands, the oxygen A band at 0.76 µ m and the weak and strong CO2 absorption bands at 1.61 and 2.06 µ m, respectively, to infer information on light scattering and the carbon dioxide column-averaged dry-air mole fraction XCO2 . In this study, we propose a one-band XCO2 retrieval technique which uses only the 2.06 µ m band measurements from the Orbiting Carbon Observatory-2 (OCO-2) satellite. We examine the data quality by comparing the OCO-2 XCO2 with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON). Over land and ocean the OCO-2 one-band retrieval shows differences from TCCON observations with a standard deviation of ∼1.30  ppm and a station-to-station variability of ∼0.50  ppm. Moreover, we compare one-band and three-band retrievals over Europe, the Middle East, and Africa and see high correlation between the two retrievals with a SD of 0.93  ppm. Compared to the three-band retrievals, XCO2 retrievals using only the 2.06 µ m band have similar retrieval accuracy, precision, and data yield.

Full-physics carbon dioxide retrievals from the Orbiting Carbon Observatory-2 (OCO-2) satellite by only using the 2.06 µm band