ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-3233-2009 Comparison of CMAM simulations of carbon monoxide (CO), nitrous oxide (N<sub>2</sub>O), and methane (CH<sub>4</sub>) with observations from Odin/SMR, ACE-FTS, and Aura/MLS Jin J. J. 1 Semeniuk K. 1 Beagley S. R. 1 Fomichev V. I. 1 Jonsson A. I. 2 McConnell J. C. 1 Urban J. 3 Murtagh D. 3 Manney G. L. 4 5 Boone C. D. 6 Bernath P. F. 6 7 Walker K. A. 2 6 Barret B. 8 Ricaud P. 8 Dupuy E. 6 Department of Earth and Space Science and Engineering, York University, Toronto, Ontario, Canada Department of Physics, University of Toronto, Toronto, Ontario, Canada Department of Radio and Space Science, Chalmers University of Technology, Goteborg, Sweden Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA New Mexico Institute of Mining and Technology, Socorro, NM, USA Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada Department of Chemistry, University of York, Heslington, York, UK Laboratoire d'Aérologie, UMR 5560 CNRS/Université Paul Sabatier, Observatoire de Midi-Pyrénées, Toulouse, France 19 05 2009 9 10 3233 3252 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/9/3233/2009/acp-9-3233-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/3233/2009/acp-9-3233-2009.pdf

Simulations of CO, N<sub>2</sub>O and CH<sub>4</sub> from a coupled chemistry-climate model (CMAM) are compared with satellite measurements from Odin Sub-Millimeter Radiometer (Odin/SMR), Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), and Aura Microwave Limb Sounder (Aura/MLS). Pressure-latitude cross-sections and seasonal time series demonstrate that CMAM reproduces the observed global CO, N<sub>2</sub>O, and CH<sub>4</sub> distributions quite well. Generally, excellent agreement with measurements is found between CO simulations and observations in the stratosphere and mesosphere. Differences between the simulations and the ACE-FTS observations are generally within 30%, and the differences between CMAM results and SMR and MLS observations are slightly larger. These differences are comparable with the difference between the instruments in the upper stratosphere and mesosphere. Comparisons of N<sub>2</sub>O show that CMAM results are usually within 15% of the measurements in the lower and middle stratosphere, and the observations are close to each other. However, the standard version of CMAM has a low N<sub>2</sub>O bias in the upper stratosphere. The CMAM CH<sub>4</sub> distribution also reproduces the observations in the lower stratosphere, but has a similar but smaller negative bias in the upper stratosphere. The negative bias may be due to that the gravity drag is not fully resolved in the model. The simulated polar CO evolution in the Arctic and Antarctic agrees with the ACE and MLS observations. CO measurements from 2006 show evidence of enhanced descent of air from the mesosphere into the stratosphere in the Arctic after strong stratospheric sudden warmings (SSWs). CMAM also shows strong descent of air after SSWs. In the tropics, CMAM captures the annual oscillation in the lower stratosphere and the semiannual oscillations at the stratopause and mesopause seen in Aura/MLS CO and N<sub>2</sub>O observations and in Odin/SMR N<sub>2</sub>O observations. The Odin/SMR and Aura/MLS N<sub>2</sub>O observations also show a quasi-biennial oscillation (QBO) in the upper stratosphere, whereas, the CMAM does not have QBO included. This study confirms that CMAM is able to simulate middle atmospheric transport processes reasonably well.

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