Articles | Volume 14, issue 4
Atmos. Meas. Tech., 14, 3087–3118, 2021
https://doi.org/10.5194/amt-14-3087-2021
Atmos. Meas. Tech., 14, 3087–3118, 2021
https://doi.org/10.5194/amt-14-3087-2021

Research article 28 Apr 2021

Research article | 28 Apr 2021

Retrieval of atmospheric CO2 vertical profiles from ground-based near-infrared spectra

Sébastien Roche et al.

Data sets

TCCON data from Lamont (US), Release GGG2014.R1 P. O. Wennberg, D. Wunch, C. M. Roehl, J.-F. Blavier, G. C. Toon, and N. T. Allen https://doi.org/10.14291/tccon.ggg2014.lamont01.r1/1255070

TCCON data from East Trout Lake, SK (CA), Release GGG2014.R1 D. Wunch, J. Mendonca, O. Colebatch, N. T. Allen, J.-F. Blavier, S. Roche, J. Hedelius, G. Neufeld, S. Springett, D. Worthy, R. Kessler, and K. Strong https://doi.org/10.14291/tccon.ggg2014.easttroutlake01.r1

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Short summary
We evaluate CO2 profile retrievals from ground-based near-infrared solar absorption spectra after implementing several improvements to the GFIT2 retrieval algorithm. Realistic errors in the a priori temperature profile (~ 2 °C in the lower troposphere) are found to be the leading source of differences between the retrieved and true CO2 profiles, differences that are larger than typical CO2 variability. A temperature retrieval or correction is critical to improve CO2 profile retrieval results.