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Poster communications

Evaluation of the Stratospheric O3 Recovery and of its Radiative Effect from the 13-years IASI Record (2008-2020)

Abstract : In this study, we present a global fingerprint of recent changes in mid-upper stratospheric (MUSt; >25hPa) and in lower stratospheric (LSt, 150-25 hPa) ozone (O3), as well as in the corresponding longwave radiative effects (LWRE), derived from the first 13 years of the IASI/Metop-A and -B satellite measurements (January 2008 – December 2020). IASI provides a unique twice daily global dataset of vertically-resolved O3 profiles and of associated instantaneous radiative kernels (IRKs), which represent the sensitivity of the outgoing longwave radiation (OLR) flux with respect to the O3 vertical profile, allowing to monitor changes in both O3 and its corresponding LWRE in these two regions of the stratosphere. 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. We describe the O3 response to global atmospheric change and, in particular, to the decline in stratospheric halogen species, which requires first identifying and quantifying natural cycles that may produce trend-like segments in the O3 time series. The disentanglement between the O3 response to its natural drivers and to the anthropogenic influence is performed by applying multivariate regressions, which account for the main geophysical drivers of O3 variation and a linear trend term, on time series of spatially gridded daily mean O3. The results of this study confirm the effectiveness of the Montreal protocol and its amendments. They show the first detection of a significant recovery of O3 concurrently in the LSt, in the MUSt and in the total column in the southern hemisphere (S.H.) from one single satellite dataset. The results also show a contrasting significant O3 decline in the LSt in the northern hemisphere (N.H.). A speeding up in both the O3 healing of the S.H. and in the LSt O3 decline of the N.H is also demonstrated. Finally, we show how these changes in O3 levels translate to changes in O3 LWRE.
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https://hal-insu.archives-ouvertes.fr/insu-03647763
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Submitted on : Wednesday, April 20, 2022 - 7:32:00 PM
Last modification on : Thursday, April 21, 2022 - 3:39:04 AM

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  • HAL Id : insu-03647763, version 1

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Catherine Wespes, Daniel Hurtmans, Simon Chabrillat, Stamatia Doniki, Cathy Clerbaux, et al.. Evaluation of the Stratospheric O3 Recovery and of its Radiative Effect from the 13-years IASI Record (2008-2020). EUMETSAT, Meteorological Satellite Conference 2021, Sep 2021, Online, Unknown Region. ⟨insu-03647763⟩

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