ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-9927-2011 Ethane, ethyne and carbon monoxide concentrations in the upper troposphere and lower stratosphere from ACE and GEOS-Chem: a comparison study González Abad G. 1 Allen N. D. C. 1 Bernath P. F. 1 Boone C. D. 2 McLeod S. D. 2 Manney G. L. 3 4 Toon G. C. 3 Carouge C. 5 Wang Y. 6 Wu S. 7 Barkley M. P. 8 9 Palmer P. I. 9 Xiao Y. 10 Fu T. M. 11 Department of Chemistry, University of York, York, UK Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA Department of Physics, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA Department of Environmental Science and Engineering, Tsinghua University, Beijing, China Department of Geological and Mining Engineering and Sciences & Department of Civil and Environmental Engineering, Michigan Technological University, Houghton MI, USA EOS Group, College of Science and Engineering, University of Leicester, UK School of GeoSciences, University of Edinburgh, UK Atmospheric and Environmental Research, Inc., Lexington, MA, USA Department of Atmospheric and Oceanic Science, School of Physics, Peking University, China 27 09 2011 11 18 9927 9941 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/9927/2011/acp-11-9927-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/9927/2011/acp-11-9927-2011.pdf

Near global upper tropospheric concentrations of carbon monoxide (CO), ethane (C<sub>2</sub>H<sub>6</sub>) and ethyne (C<sub>2</sub>H<sub>2</sub>) from ACE (Atmospheric Chemistry Experiment) Fourier transform spectrometer on board the Canadian satellite SCISAT-1 are presented and compared with the output from the Chemical Transport Model (CTM) GEOS-Chem. The retrievals of ethane and ethyne from ACE have been improved for this paper by using new sets of microwindows compared with those for previous versions of ACE data. With the improved ethyne retrieval we have been able to produce a near global upper tropospheric distribution of C<sub>2</sub>H<sub>2</sub> from space. Carbon monoxide, ethane and ethyne concentrations retrieved using ACE spectra show the expected seasonality linked to variations in the anthropogenic emissions and destruction rates as well as seasonal biomass burning activity. The GEOS-Chem model was run using the dicarbonyl chemistry suite, an extended chemical mechanism in which ethyne is treated explicitly. Seasonal cycles observed from satellite data are well reproduced by the model output, however the simulated CO concentrations are found to be systematically biased low over the Northern Hemisphere. An average negative global mean bias of 12% and 7% of the model relative to the satellite observations has been found for CO and C<sub>2</sub>H<sub>6</sub> respectively and a positive global mean bias of 1% has been found for C<sub>2</sub>H<sub>2</sub>. ACE data are compared for validation purposes with MkIV spectrometer data and Global Tropospheric Experiment (GTE) TRACE-A campaign data showing good agreement with all of them.

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