Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 3861-3878, 2017
https://doi.org/10.5194/acp-17-3861-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
21 Mar 2017
Global distribution of CO2 in the upper troposphere and stratosphere
Mohamadou Diallo1,2,7, Bernard Legras1, Eric Ray3,4, Andreas Engel5, and Juan A. Añel2,6 1Laboratoire de Météorologie Dynamique, UMR8539, IPSL, CNRS/ENS/UPMC/Ecole Polytechnique, Paris, France
2EPhysLab, Facultade de ciencias, Universidade de Vigo, Ourense, Spain
3Chemical Sciences Division, Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
4Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
5Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
6Smith School of Enterprise and the Environment, University of Oxford, Oxford, UK
7Institute for Energy and Climate Research – Stratosphere (IEK-7), Forschungszentrum Jülich, Jülich, Germany
Abstract. In this study, we construct a new monthly zonal mean carbon dioxide (CO2) distribution from the upper troposphere to the stratosphere over the 2000–2010 time period. This reconstructed CO2 product is based on a Lagrangian backward trajectory model driven by ERA-Interim reanalysis meteorology and tropospheric CO2 measurements. Comparisons of our CO2 product to extratropical in situ measurements from aircraft transects and balloon profiles show remarkably good agreement. The main features of the CO2 distribution include (1) relatively large mixing ratios in the tropical stratosphere; (2) seasonal variability in the extratropics, with relatively high mixing ratios in the summer and autumn hemisphere in the 15–20 km altitude layer; and (3) decreasing mixing ratios with increasing altitude from the upper troposphere to the middle stratosphere ( ∼ 35 km). These features are consistent with expected variability due to the transport of long-lived trace gases by the stratospheric Brewer–Dobson circulation. The method used here to construct this CO2 product is unique from other modelling efforts and should be useful for model and satellite validation in the upper troposphere and stratosphere as a prior for inversion modelling and to analyse features of stratosphere–troposphere exchange as well as the stratospheric circulation and its variability.

Citation: Diallo, M., Legras, B., Ray, E., Engel, A., and Añel, J. A.: Global distribution of CO2 in the upper troposphere and stratosphere, Atmos. Chem. Phys., 17, 3861-3878, https://doi.org/10.5194/acp-17-3861-2017, 2017.
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Short summary
We construct a new monthly zonal mean CO2 distribution from the upper troposphere to the stratosphere over the 2000–2010 period. The main features of the CO2 distribution are consistent with expected variability due to the transport of long-lived trace gases by the Brewer–Dobson circulation. The method used to construct this CO2 product is unique and should be useful for model and satellite validation in the upper troposphere and stratosphere.
We construct a new monthly zonal mean CO2 distribution from the upper troposphere to the...
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