Preprints
https://doi.org/10.5194/amt-2020-433
https://doi.org/10.5194/amt-2020-433

  27 Jan 2021

27 Jan 2021

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

Monitoring the TROPOMI-SWIR module instrument stability using desert sites

Tim A. van Kempen1, Filippo Oggionni2, and Richard M. van Hees1 Tim A. van Kempen et al.
  • 1SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, the Netherlands
  • 2Delft University of Technology, Faculty of Aerospace Engineering, Kluyverweg 1, 2629 HS, Delft, the Netherlands

Abstract. Since its launch in 2017, the TROPOMI instrument on S-5P has provided very high quality data using daily global coverage for a number of key atmospheric trace gasses. Over its first 1,000 days in operations, the SWIR module has been very stable and the continuously monitored calibration has remained of high quality. This calibration relies on a combination of extensive pre-launch and post-launch measurements, complemented by regular monitoring of internal light sources and background measurements. In this paper we present a method and results for independent validation of the SWIR module calibration and instrument stability by examining the signal stability of a sample of 23 pseudo-invariant calibration desert sites. The data covers over two years of operational data. With a Lambertian surface assumption, the results show that the SWIR module has little to no instrument degradation down to an accuracy of about 0.3 % per year, validating results obtained from the internal calibration suite. The method presented here will be used as ongoing validation of the SWIR calibration.

Tim A. van Kempen et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2020-433', Anonymous Referee #1, 15 Apr 2021
    • AC1: 'Reply on RC1', Tim van Kempen, 23 Jun 2021
  • RC2: 'Comment on amt-2020-433', Christian Frankenberg, 13 Jun 2021
    • AC2: 'Reply on RC2', Tim van Kempen, 24 Jun 2021
  • AC3: 'Comment on amt-2020-433', Tim van Kempen, 07 Jul 2021
    • EC1: 'My comment to which this reply responds', Mark Weber, 07 Jul 2021

Tim A. van Kempen et al.

Tim A. van Kempen et al.

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Short summary
Validation of the instrument stability of the TROPOMI-SWIR module is done by monitoring the a group of very stable and remote locations in the Saharan and Arabian deserts. These confirm the excellent stability and lack of degradation of the TROPOMI-SWIR module derived from the internal calibration sources. The method was done for the first time on a spectrometer in the short-wave infrared and ensures TROPOMI-SWIR can be used for atmospheric research for years to come.