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Tropospheric ozone from IASI

Maxim Eremenko(1), Corneli Keim(1,3), Gaëlle Dufour(1), Gilles Foret(1), Johannes Orphal(1,2), Matthias Beekmann(1), Michael Höpfner(2), Gilles Bergametti(1) and Jean-Marie Flaud(1)

(1) LISA - CNRS/Univ Paris 12 & 7, 61 avenue du général de Gaulle, 94010 Créteil Cedex, France
(2) IMK-FZK, Postfach 3640, 76021 Karlsruhe, Germany
(3) Astrium GmbH, , , Germany

Abstract

In this paper we present tropospheric ozone column amounts (0-6 km) obtained from infrared radiances measured by the IASI instrument aboard the MetOp-A satellite using an altitude-dependent regularization method. As a first demonstration we have focused on the heat wave over Southern Europe in summer 2007 and observed very high values, in agreement with predictions from a chemical transport model of tropospheric photochemistry (CHIMERE), see Ref. [1]. Our ozone product has been validated by comparing it to ozone profiles from balloon sonde measurements in the northern midlatitudes for the period from July 2007 to August 2008 (Ref [2]): A very good agreement was obtained for the scientific products but a significant bias has been identified with the operational products (v4.2). We showed that the seasonal variations of ozone retrieved for different latitude bands are comparable with reference climatologies (mean and variability). Extended results covering summer 2008 over Europe and comparisons with several chemical transport models allow estimating the gain of IASI ozone measurements for improving model analysis and predictions. Some additional results concerning other parts of the world subject to strong pollution will be also presented.

[1] M. Eremenko, G. Dufour, G. Foret, C. Keim, J. Orphal, M. Beekmann, G. Bergametti, and J.-M. Flaud: “Tropospheric ozone distributions over Europe during the heat wave in July 2007 observed from infrared Nadir spectra measured by IASI”, Geophys. Res. Lett. 35, L18805, doi:10.1029/2008GL034803, 2008.

[2] C. Keim et al.: “Tropospheric ozone from IASI: comparison of different inversion algorithms and validation with ozone sondes in the northern middle latitudes”, accepted for ACPD, IASI special issue.

 

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