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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 12 | Copyright
Atmos. Meas. Tech., 7, 4367-4385, 2014
https://doi.org/10.5194/amt-7-4367-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Dec 2014

Research article | 10 Dec 2014

Towards IASI-New Generation (IASI-NG): impact of improved spectral resolution and radiometric noise on the retrieval of thermodynamic, chemistry and climate variables

C. Crevoisier1, C. Clerbaux2, V. Guidard3, T. Phulpin4, R. Armante1, B. Barret5, C. Camy-Peyret6, J.-P. Chaboureau5, P.-F. Coheur7, L. Crépeau1, G. Dufour8, L. Labonnote9, L. Lavanant10, J. Hadji-Lazaro2, H. Herbin9, N. Jacquinet-Husson11, S. Payan2, E. Péquignot4, C. Pierangelo4, P. Sellitto8,*, and C. Stubenrauch1 C. Crevoisier et al.
  • 1Laboratoire de Météorologie Dynamique, IPSL, CNRS, Ecole Polytechnique, Palaiseau, France
  • 2UPMC Université Paris 6; Université Versailles St-Quentin; CNRS-INSU, LATMOS-IPSL, Paris, France
  • 3Météo-France and CNRS / CNRM-GAME, Toulouse, France
  • 4Centre National d'Etudes Spatiales (CNES), Toulouse, France
  • 5Laboratoire d'Aérologie/OMP, University of Toulouse and CNRS, Toulouse, France
  • 6Institut Pierre Simon Laplace, Paris, France
  • 7Spectroscopie de l'Atmosphère, Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles (ULB), Brussels, Belgium
  • 8Laboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS, Universités Paris Est Créteil et Paris Diderot, Créteil, France
  • 9Laboratoire d'Optique Atmosphérique (LOA), Université Lille-1, Villeneuve d'Ascq, France
  • 10Météo-France / CMS, Lannion, France
  • 11Laboratoire de Météorologie Dynamique, IPSL, CNRS, UPMC Université Paris 6, Paris, France
  • *now at: Laboratoire de Météorologie Dynamique, IPSL, CNRS, Ecole Normale Supérieure, Paris, France

Abstract. Besides their strong contribution to weather forecast improvement through data assimilation, thermal infrared sounders onboard polar-orbiting platforms are now playing a key role for monitoring atmospheric composition changes. The Infrared Atmospheric Sounding Interferometer (IASI) instrument developed by the French space agency (CNES) and launched by EUMETSAT onboard the Metop satellite series is providing essential inputs for weather forecasting and pollution/climate monitoring owing to its smart combination of large horizontal swath, good spectral resolution and high radiometric performance. EUMETSAT is currently preparing the next polar-orbiting program (EPS-SG) with the Metop-SG satellite series that should be launched around 2020. In this framework, CNES is studying the concept of a new instrument, the IASI-New Generation (IASI-NG), characterized by an improvement of both spectral and radiometric characteristics as compared to IASI, with three objectives: (i) continuity of the IASI/Metop series; (ii) improvement of vertical resolution; and (iii) improvement of the accuracy and detection threshold for atmospheric and surface components. In this paper, we show that an improvement of spectral resolution and radiometric noise fulfil these objectives by leading to (i) a better vertical coverage in the lower part of the troposphere, thanks to the increase in spectral resolution; and (ii) an increase in the accuracy of the retrieval of several thermodynamic, climate and chemistry variables, thanks to the improved signal-to-noise ratio as well as less interference between the signatures of the absorbing species in the measured radiances. The detection limit of several atmospheric species is also improved. We conclude that IASI-NG has the potential to strongly benefit the numerical weather prediction, chemistry and climate communities now connected through the European GMES/Copernicus initiative.

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