Preprints
https://doi.org/10.5194/amt-2021-357
https://doi.org/10.5194/amt-2021-357

  15 Nov 2021

15 Nov 2021

Review status: this preprint is currently under review for the journal AMT.

Spectral performance analysis of the Aeolus Fabry-Pérot and Fizeau interferometers during the first years of operation

Benjamin Witschas1, Christian Lemmerz1, Oliver Lux1, Uwe Marksteiner1, Oliver Reitebuch1, Fabian Weiler1, Frederic Fabre2, Alain Dabas3, Thomas Flament3, Dorit Huber4, and Michael Vaughan5 Benjamin Witschas et al.
  • 1Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Physik der Atmosphäre, 82234 Oberpfaffenhofen, Germany
  • 2Les Myriades SAS, Consultancy for Optical Systems, 31000 Toulouse, France
  • 3Centre National de Recherche Meteorologique, Groupe d’etude de l’Atmosphere Meteorologique, Météo-France and CNRS, Toulouse, France
  • 4DoRIT, 82256 Fürstenfeldbruck, Germany
  • 5Optical & Lidar Associates OLA, Buckinghamshire, United Kingdom

Abstract. In August 2018, the European Space Agency (ESA) launched the first Doppler wind lidar into space which has since then been providing continuous profiles of the horizontal line-of-sight wind component at a global scale. Aeolus data has been successfully assimilated into several NWP models and demonstrated a positive impact on the quality of the weather forecasts. In order to provide valuable input data for NWP models, a detailed characterization of the Aeolus instrumental performance as well as the realization and minimization of systematic error sources is crucial. In this paper, Aeolus interferometer spectral drifts and their potential as systematic error sources for the aerosol and wind product are investigated by means of instrument spectral registration (ISR) measurements that are performed on a weekly basis. During these measurements, the laser frequency is scanned over a range of 11 GHz in steps of 25 MHz and thus spectrally resolves the transmission curves of the Fizeau interferometer and the Fabry-Perot interferometers (FPIs) used in Aeolus. Mathematical model functions are derived in order to analyze the measured transmission curves by means of non-linear fit procedures. The obtained fit parameters are used to draw conclusions about the Aeolus instrumental alignment and potentially ongoing drifts. The introduced instrumental functions and analysis tools may also be applied for the upcoming missions using similar spectrometers as for instance EarthCARE (ESA) which is based on the Aeolus FPI design.

Benjamin Witschas et al.

Status: open (until 27 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-357', Anonymous Referee #1, 29 Nov 2021 reply

Benjamin Witschas et al.

Benjamin Witschas et al.

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Short summary
In August 2018, ESA has launched the first Doppler wind lidar into space. In order to calibrate the instrument and to monitor the overall instrument conditions, instrument spectral registration measurements have been performed with Aeolus on a weekly basis. Based on these measurements, tools and mathematical model functions in order to analyze the measured spectrometer transmission curves and with that, to estimate alignment drifts of the Aeolus satellite instrument.