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Published September 2012 | public
Journal Article

Vertically constrained CO_2 retrievals from TCCON measurements


Partial column-averaged carbon dioxide (CO_2) mixing ratio in three tropospheric layers has been retrieved from Total Carbon Column Observing Network (TCCON) spectra in the 1.6 μm CO_2 absorption band. Information analysis suggests that a measurement with ∼60 absorption lines provides three or more pieces of independent information, depending on the signal-to-noise ratio and solar zenith angle. This has been confirmed by retrievals based on synthetic data. Realistic retrievals for both total and partial column-averaged CO_2 over Park Falls, Wisconsin on July 12, 15, and August 14, 2004, agree with aircraft measurements. Furthermore, the retrieved total column averages are always underestimated by less than 1%. The results above provide a basis for CO_2 profile retrievals using ground-based observations in the near-infrared region.

Additional Information

© 2012 Elsevier Ltd. Received 28 October 2011, Revised 24 April 2012, Accepted 26 April 2012, Available online 5 May 2012. This research is supported in part by the Orbiting Carbon Observatory 2(OCO-2) project, a NASA Earth System Science Pathfinder (ESSP) mission and Project JPL. 1382974 to the California Institute of Technology. Support for TCCON and operations at Park Falls Wisconsin are provided by a grant from NASA to the California Institute of Technology (NNX11AG01G). We would like to thank Gretchen Keppel Aleks, Mimi Gerstell, Vijay Natraj, Sally Newman, Jack Margolis, Xi Zhang, King-Fai Li, and Michael Line for useful discussions and comments on the paper. Special thanks are given to G. Toon and P. Wennberg for making available their code and data, and for valuable discussions.

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