Atmos. Chem. Phys. Discuss., 9, 12829-12856, 2009
© Author(s) 2009. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Evaluating the potential of IASI ozone observations to constrain simulated surface ozone concentrations
G. Foret1, M. Beekmann1, M. Eremenko1, L. Hamaoui1,2, C. Schmechtig1, C. Keim1, G. Dufour1, A. Boynard1,3, and A. Ung2
1Université Paris 12 et 7, CNRS UMR 7583, Laboratoire Interuniversitaire des Systèmes Atmosphériques/IPSL, Créteil, France
2Institut National de l'Environnement Industriel et des Risques, Chronic Risks Division, Parc Technologique Alata, Verneuil-en-Halatte, France
3UPMC Université Paris 06, CNRS UMR 8190, Laboratoire Atmosphères, Milieux, Observations Spatiales/IPSL, Paris, France

Abstract. A tracer study has been performed for two summers in 2003 and 2004 with a regional chemistry- transport model in order to evaluate the potential constraint that tropospheric ozone observations from nadir viewing infrared sounders like IASI or TES exert on modeled near surface ozone. As these instruments show high sensitivity in the free troposphere, but low sensitivity at ground, our study addresses which amount of this information is transferred to ground through vertical transport processes. Within the European model domain, and within a time span of 4 days, only ozone like tracers initialised in vertical layers above 500 hPa are transported to the surface. For a tracer initialised between 800 and 700 hPa, seven percent reaches the surface within one to three days, when averaging over the whole European model domain, but more than double of it over the Mediterranean sea. These results are confirmed by a second tracer study taking into account averaging kernels related to IASI retrievals.

Citation: Foret, G., Beekmann, M., Eremenko, M., Hamaoui, L., Schmechtig, C., Keim, C., Dufour, G., Boynard, A., and Ung, A.: Evaluating the potential of IASI ozone observations to constrain simulated surface ozone concentrations, Atmos. Chem. Phys. Discuss., 9, 12829-12856, doi:10.5194/acpd-9-12829-2009, 2009.
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