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

Inclusion of line-mixing into spectroscopic models is required for precise and accurate dry-mole-fraction column CO2 retrievals from a satellite instrument. We measure first-order line-mixing parameters of thirteen (CO2)-C-12 20(0)1(3) <- 00(0)0 CO2 transitions near 2.05 mu m using tunable laser spectroscopy. We also report line position measurements of twelve (CO2)-C-13 and (OCO)-O-18 transitions in this spectral region. By incorporating line-mixing into a simple atmospheric model, we show how biases in CO2 retrievals can be generated if line-mixing is ignored. (C) 2012 Elsevier Ltd. All rights reserved.