Atmospheric CO₂ retrieved from ground-based near IR solar spectra

[1] The column-averaged volume mixing ratio (VMR) of CO₂ over Kitt Peak, Arizona, has been retrieved from high-resolution solar absorption spectra obtained with the Fourier transform spectrometer on the McMath telescope. Simultaneous column measurements of CO₂ at ∼6300 cm⁻¹ and O₂ at ∼7900 cm⁻¹ were ratioed to minimize systematic errors. These column ratios were then scaled by the mean O₂ VMR (0.2095) to yield column-averaged vmrs of CO₂. These display similar behavior to the Mauna Loa in situ surface measurements. During the period 1977–1995, the column-averaged mixing ratio of CO₂ increased at an average rate of 1.49 ± 0.04 ppmv/yr with seasonal variations of ∼7 ppmv peak-to-peak. Our retrievals demonstrate that this remote technique is capable of precisions better than 0.5%.