The objective of Sentinel-4 is to monitor key air quality trace gases and aerosols over Europe at high spatial resolution with a fast (hourly) revisit time, in support of Copernicus.

MTG-S showing instruments

Sentinel-4 covers the need for continuous monitoring of atmospheric composition. The mission will focus on air quality, with the main data products being Ozone (O3), nitrogen dioxide (NO2), sulphur dioxide (SO2), formaldehyde (HCHO) and aerosol optical depth.

The instruments used for the Sentinel-4 mission will be carried on Meteosat Third Generation. Sentinel-4 mission is made up of the Ultraviolet Visible Near-infrared (UVN) spectrometer and data from thermal Infrared Sounder (IRS), both on the MTG-Sounder (MTG-S) satellite.

The infrared sounder will operate in synergy with the ultraviolet sounder, to provide a unique, integrated capability to observe ozone, carbon monoxide, sulphur dioxide and other trace gases, in support of air quality, pollution and climate monitoring.

UVNS Characteristics

The UVNS will have:

  • An operational field of view of 4° north-south and 11° east-west.
  • Pushbroom in E/W direction
  • Two grating (dispersive) spectrometers
  • CCD detectors cooled at 230 K
  • High SNR
  • Scan mirror: E/W scan and N/S for compensation of MTG yaw flip manoeuvre around equinox; seasonal shift in latitude (per steps of 5º up to 10º)
  • High performance on board calibration sources (diffusers, lamp, LED)
  • Mass = 150 kg
  • Power = 180 W
  • Data rate = 25 Mbit/s
UVNS Spectral information
Band Spectral range (nm) Spectral resolution (nm) Spectral oversampling (pixels)
UV 305–400 0.5 3
VIS 400–500 0.5 3
NIR 750–775 0.12 3

Further details can be found in the conference paper The Sentinel-4 mission, its components and implementation (PDF, 176 KB).

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