Tunable laser spectroscopy of CO _2 near 2.05μm: Atmospheric retrieval biases due to neglecting line-mixing

摘要

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 ~01 _3←00 ~00 CO _2 transitions near 2.05μm 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.