Preprints
https://doi.org/10.5194/amt-2024-24
https://doi.org/10.5194/amt-2024-24
12 Mar 2024
 | 12 Mar 2024
Status: this preprint is currently under review for the journal AMT.

Assessment of the contribution of IRS for the characterisation of ozone over Europe

Francesca Vittorioso, Vincent Guidard, and Nadia Fourrié

Abstract. In the coming years, EUMETSAT’s Meteosat Third Generation – S (MTG-S) satellites will be launched with an instrument of valuable features on board. The MTG – Infrared Sounder (IRS) will represent a major innovation for the monitoring of the chemical state of the atmosphere, since, at present, observations of these parameters mainly come from in situ measurements (geographically uneven) and from instruments on board of polar-orbiting satellites (highly dependent on the scanning line of the satellite itself, which is limited, over a specific geographical area, to very few times per day). MTG-IRS will present many potentialities in the area of detecting different atmospheric species and will have the advantage of being based on a geostationary platform and to acquire data with a high temporal frequency (every 30 minutes over Europe), which makes easier to track the transport of the species of interest.

The present work aims to evaluate the potential impact, over a regional domain over Europe, of the assimilation of IRS radiances within a chemical transport model (CTM) Modèle de Chimie Atmosphérique de Grande Echelle (MOCAGE), operational in Météo-France.

Since IRS is not yet in orbit, observations have been simulated using the Observing System Simulation Experiment (OSSE) approach. Of the species to which IRS will be sensitive, the one treated along this study was the ozone.

The results obtained indicate that the assimilation of synthetic radiances of IRS always has a positive impact on the ozone analysis from the model MOCAGE. The relative average difference compared to the NR in the ozone total columns improves from -30 % (no assimilation) to almost zero when IRS observations are available over the domain. When considering tropospheric columns the improvement is also significant, from 15–20 % (no assimilation) down to 3 %.

Francesca Vittorioso, Vincent Guidard, and Nadia Fourrié

Status: open (until 16 Apr 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2024-24', Kris Wargan, 01 Apr 2024 reply
  • RC2: 'Comment on amt-2024-24', Timothy Schmit, 01 Apr 2024 reply
Francesca Vittorioso, Vincent Guidard, and Nadia Fourrié
Francesca Vittorioso, Vincent Guidard, and Nadia Fourrié

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Short summary
The future Meteosat Third Generation Infrared Sounder (MTG-IRS) will represent a major innovation for the monitoring of the chemical state of the atmosphere. MTG-IRS will have the advantage of being based on a geostationary platform and to acquire data with a high temporal frequency. This work aims to evaluate the potential impact over Europe within a chemical transport model (MOCAGE). The results indicate that the assimilation of these data always has a positive impact on the ozone analysis.