ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-4493-2012 Assimilation of IASI satellite CO fields into a global chemistry transport model for validation against aircraft measurements Klonecki A. 1 Pommier M. 2 11 Clerbaux C. 2 3 Ancellet G. 2 Cammas J.-P. 4 Coheur P.-F. 3 Cozic A. 5 Diskin G. S. 6 Hadji-Lazaro J. 2 Hauglustaine D. A. 5 Hurtmans D. 3 Khattatov B. 7 Lamarque J.-F. 7 Law K. S. 2 Nedelec P. 4 Paris J.-D. 5 Podolske J. R. 8 Prunet P. 1 Schlager H. 9 Szopa S. 5 Turquety S. 10 NOVELTIS, Ramonville-Saint-Agne, France UPMC Univ. Paris 06; Université Versailles St-Quentin; CNRS/INSU, LATMOS-IPSL, Paris, France Spectroscopie de l'Atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles (ULB), Brussels, Belgium Université de Toulouse, CNRS, UMR5560, Laboratoire d'Aérologie, Toulouse, France LSCE/IPSL, CEA-CNRS-UVSQ, Saclay, France NASA Langley Research Center, MS 483, Hampton, USA National Center for Atmospheric Research, Boulder, Colorado, USA NASA Ames Research Center, Moffett Field, California, 94035, USA DLR, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany UPMC Univ. Paris 06; Ecole Polytechnique; CNRS UMR 8539, LMD-IPSL, Palaiseau, France now at: Air Quality Research Division, Science and Technology Branch, Environment Canada, Toronto, Ontario, Canada 22 05 2012 12 10 4493 4512 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/12/4493/2012/acp-12-4493-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/4493/2012/acp-12-4493-2012.pdf

This work evaluates the IASI CO product against independent in-situ aircraft data from the MOZAIC program and the POLARCAT aircraft campaign. The validation is carried out by analysing the impact of assimilation of eight months of IASI CO columns retrieved for the period of May to December 2008 into the global chemistry transport model LMDz-INCA. A modelling system based on a sub-optimal Kalman filter was developed and a specific treatment that takes into account the representativeness of observations at the scale of the model grid is applied to the IASI CO columns and associated errors before their assimilation in the model. Comparisons of the assimilated CO profiles with in situ CO measurements indicate that the assimilation leads to a considerable improvement of the model simulations in the middle troposphere as compared with a control run with no assimilation. Model biases in the simulation of background values are reduced and improvement in the simulation of very high concentrations is observed. The improvement is due to the transport by the model of the information present in the IASI CO retrievals. Our analysis also shows the impact of assimilation of CO on the representation of transport into the Arctic region during the POLARCAT summer campaign. A considerable increase in CO mixing ratios over the Asian source region was observed when assimilation was used leading to much higher values of CO during the cross-pole transport episode. These higher values are in good agreement with data from the POLARCAT flights that sampled this plume.

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