Tunable laser spectroscopy of CO2 near 2.05 μm: Atmospheric retrieval biases due to neglecting line-mixing

Abstract Inclusion of line-mixing into spectroscopic models is required for precise and accurate dry-mole-fraction column CO 2 retrievals from a satellite instrument. We measure first-order line-mixing parameters of thirteen 12 CO 2 20 0 1 3 ←00 0 0 CO 2 transitions near 2.05 μm using tunable laser spectroscopy. We also report line position measurements of twelve 13 CO 2 and 18 OCO transitions in this spectral region. By incorporating line-mixing into a simple atmospheric model, we show how biases in CO 2 retrievals can be generated if line-mixing is ignored.