Upper stratospheric O3 recovery as observed by IASI over 10 years of measurements

Abstract : In this study, we assess how daily ozone (O3) measurements from the first ten years of the Infrared Atmospheric Sounding Interferometer (IASI/MetOp-A) operation can contribute to the determination of the processes driving O3 variability and to the monitoring of long-term trends in the stratosphere. To that end, we rely on the IASI ozone profiles retrieved with the Fast Optimal Retrievals on Layers for IASI (FORLI) software set up at ULB for near real time and large scale processing of IASI data. We present the global fingerprints of recent changes in the stratospheric O3 measured over January 2008 - December 2017. Using a dedicated regression model applied on gridded daily mean O3 time series, we discriminate anthropogenic trends from various modes of natural variability which are accounted for in the regression model by a series of geophysical parameters. The results show that the effectiveness of the Montreal Protocole is measureable by IASI in the upper stratosphere at a global scale and, more particularly, at mid-high latitudes of both hemispheres where the trend reaches +1.5 DU/decade. Nevertheless, we calculate that 5 years of additional measurements are required to detect an unequivocal upper stratospheric O3 recovery of |1.5| DU/decade at a global scale.
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Poster communications
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https://hal-insu.archives-ouvertes.fr/insu-01967672
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Submitted on : Tuesday, January 1, 2019 - 11:50:53 AM
Last modification on : Sunday, July 21, 2019 - 6:40:50 AM

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  • HAL Id : insu-01967672, version 1

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Catherine Wespes, Daniel Hurtmans, Gaétane Ronsmans, Cathy Clerbaux, Pierre-François Coheur. Upper stratospheric O3 recovery as observed by IASI over 10 years of measurements. EGU 2018, 20th EGU General Assembly, Apr 2018, Vienna, Austria. ⟨insu-01967672⟩

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