Chevalier, F. and Wennberg, P. and Wunch, D. (2011) Global CO_2 fluxes inferred from surface air-sample measurements and from TCCON retrievals of the CO_2 total column. Geophysical Research Letters, 38 . Art. No. L24810. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20120203-154119565
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We present the first estimate of the global distribution of CO_2 surface fluxes from 14 stations of the Total Carbon Column Observing Network (TCCON). The evaluation of this inversion is based on 1) comparison with the fluxes from a classical inversion of surface air-sample-measurements, and 2) comparison of CO_2 mixing ratios calculated from the inverted fluxes with independent aircraft measurements made during the two years analyzed here, 2009 and 2010. The former test shows similar seasonal cycles in the northern hemisphere and consistent regional carbon budgets between inversions from the two datasets, even though the TCCON inversion appears to be less precise than the classical inversion. The latter test confirms that the TCCON inversion has improved the quality (i.e., reduced the uncertainty) of the surface fluxes compared to the assumed or prior fluxes. The consistency between the surface-air-sample-based and the TCCON-based inversions despite remaining flaws in transport models opens the possibility of increased accuracy and robustness of flux inversions based on the combination of both data sources and confirms the usefulness of space-borne monitoring of the CO_2 column.
|Additional Information:||© 2011 by the American Geophysical Union. Received 6 October 2011; revised 11 November 2011; accepted 20 November 2011; published 29 December 2011. TCCON data were obtained from the TCCON Data Archive, operated by the California Institute of Technology from the website at http://tccon.ipac.caltech.edu/. This work was performed using HPC resources of DSM-CCRT and of [CCRT/CINES/IDRIS] under the allocation 2011-t2011012201 made by GENCI (Grand Equipement National de Calcul Intensif). It was co-funded by the European Commission under the EU Seventh Research Framework Programme (grants agreements 218793, MACC, and 212196, COCOS). Support for TCCON is provided by many national research support organizations that are listed on the TCCON web site. The authors are very grateful to the many people involved in the surface and aircraft measurement and in the archiving of these data. The Editor thanks two anonymous reviewers for their assistance in evaluating this paper.|
|Official Citation:||Chevallier, F., et al. (2011), Global CO2 fluxes inferred from surface air-sample measurements and from TCCON retrievals of the CO2 total column, Geophys. Res. Lett., 38, L24810, doi:10.1029/2011GL049899.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||06 Feb 2012 17:35|
|Last Modified:||07 Feb 2017 00:39|
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