Tunable laser spectroscopy of CO2 near 2.05μm: 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 12CO2 20013←0000 CO2 transitions near 2.05μm using tunable laser spectroscopy. We als...

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Bibliographic Details
Published inJournal of quantitative spectroscopy & radiative transfer Vol. 113; no. 10; pp. 739 - 748
Main Authors Christensen, L.E., Spiers, G.D., Menzies, R.T., Jacob, J.C.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2012
Subjects
ASCENDS
Carbon dioxide
LIDAR
Line-mixing
Mathematical models
Position measurement
Radiative transfer
Retrieval
Spectral lines
Spectroscopy
Tunable laser
Tunable lasers
Spectroscopy
LIDAR
Tunable laser
Line-mixing
ASCENDS
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Summary: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 12CO2 20013←0000 CO2 transitions near 2.05μm using tunable laser spectroscopy. We also report line position measurements of twelve 13CO2 and 18OCO 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. ► Not accounting for line mixing can cause biases in satellite retrieved CO2 greater than 0.5%. ► Tunable laser spectroscopy offers a useful tool for probing absorption lineshapes. ► Line positions are measured for CO2 isotopologues near 2.05μm.
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content type line 23
ISSN:0022-4073
1879-1352
DOI:10.1016/j.jqsrt.2012.02.031