O3 variability/trend in the troposphere and the stratosphere from IASI observations in 2008-2017

Abstract : In this study, we present geographical patterns of ozone (O3) variability in the troposphere and the stratosphere derived from 9 years of IASI observations (2008-2017). The instrument provides a unique dataset of global vertically-resolved O3 profiles with a twice daily global coverage and a fairly good vertical resolution in both the troposphere and the stratosphere, allowing to monitor the year-to-year variability in these layers. The retrievals are performed using the FORLI software, a fast radiative transfer model based on the optimal estimation method, set up for near real-time and large scale processing of IASI data. Multivariate regressions, which include important geophysical drivers of O3 variation (e.g. solar flux - SF, quasi biennial oscillations - QBO, El Niño/Southern Oscillation - ENSO, North Atlantic Oscillation-NAO) and a linear trend term, have been performed on time series of spatially gridded averaged O3. The performance of the regression models for the different altitude layers is evaluated in terms of the representativeness of the fitted model and explanatory variables. The spatial structures of the resulting covariates and trends are then analyzed. In particular, we will also focus on O3 trends observed in the upper stratosphere, which possibly point out a recovery of upper stratospheric ozone, and in the troposphere over and downwind anthropogenic polluted areas characterized either by increased (e.g. over Asia) or decreased (e.g. over Europe and the US) O3 precursor emissions. FORLI O3-CO correlations patterns in the troposphere will also be discussed to evaluate the continental influence on tropospheric O3 trends.
Type de document :
Poster
EUMETSAT Meteorological Satellite Conference 2017, Oct 2017, Rome, Italy
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https://hal-insu.archives-ouvertes.fr/insu-01644416
Contributeur : Catherine Cardon <>
Soumis le : mercredi 22 novembre 2017 - 11:38:01
Dernière modification le : mardi 29 mai 2018 - 12:51:08

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  • HAL Id : insu-01644416, version 1

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Catherine Wespes, Daniel Hurtmans, Anne Boynard, Cathy Clerbaux, Pierre-François Coheur. O3 variability/trend in the troposphere and the stratosphere from IASI observations in 2008-2017. EUMETSAT Meteorological Satellite Conference 2017, Oct 2017, Rome, Italy. 〈insu-01644416〉

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