29 September 2017 The Copernicus Sentinel 4 mission: a geostationary imaging UVN spectrometer for air quality monitoring
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Sentinel-4 is an imaging UVN (UV-VIS-NIR) spectrometer, developed by Airbus Defence and Space under ESA contract in the frame of the joint EU/ESA COPERNICUS program. The mission objective is the operational monitoring of trace gas concentrations for atmospheric chemistry and climate applications – hence the motto of Sentinel-4 “Knowing what we breathe”. Sentinel-4 will provide accurate measurements of key atmospheric constituents such as ozone, nitrogen dioxide, sulfur dioxide, methane, and aerosol properties over Europe and adjacent regions from a geostationary orbit (see Fig. 1). In the family of already flown UVN spectrometers (SCIAMACHY, OMI, GOME and GOME 2) and of those spectrometers currently under development (Sentinel-5p and Sentinel-5), Sentinel-4 is unique in being the first geostationary UVN mission. Furthermore, thanks to its 60-minutes repeat cycle measurements and high spatial resolution (8x8 km2), Sentinel-4 will increase the frequency of cloud-free observations, which is necessary to assess troposphere variability. Two identical Sentinel-4 instruments (PFM and FM-2) will be embarked, as Customer Furnished Item (CFI), fully verified, qualified and calibrated respectively onto two EUMETSAT satellites: Meteosat Third Generation-Sounder 1 and 2 (MTG-S1 and MTG-S2), whose Flight Acceptance Reviews are presently planned respectively in Q4 2021 and Q1 2030. This paper gives an overview of the Sentinel-4 system1 architecture, its design and development status, current performances and the key technological challenges.
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G. Bazalgette Courrèges-Lacoste, G. Bazalgette Courrèges-Lacoste, M. Sallusti, M. Sallusti, G. Bulsa, G. Bulsa, G. Bagnasco, G. Bagnasco, Ben Veihelmann, Ben Veihelmann, S. Riedl, S. Riedl, D. J. Smith, D. J. Smith, R. Maurer, R. Maurer, } "The Copernicus Sentinel 4 mission: a geostationary imaging UVN spectrometer for air quality monitoring", Proc. SPIE 10423, Sensors, Systems, and Next-Generation Satellites XXI, 1042307 (29 September 2017); doi: 10.1117/12.2282158; https://doi.org/10.1117/12.2282158

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