16 February 2023
19 May 2020
The objectives of the Sentinel-5 polar-orbiting atmospheric monitoring missions are:
- Measurements of ozone profile and total column
- Measurement of columns of sulphur dioxide (SO2), nitrogen dioxide (NO2), water vapour, methane (CH4), carbon dioxide (CO2), carbon monoxide (CO)
- Measurement of bromine monoxide (BrO),formaldehyde (HCHO), glyoxal (OCHCHO)
- Measurement of volcanic plumes
Carried on the polar-orbiting Metop-SG-A satellite, the Sentinel-5 mission comprises an Ultraviolet Visible Near-infrared Shortwave (UVNS) spectrometer and data from the Infrared Atmospheric Sounding Interferometer (IASI-NG), the Visible Infrared Imager (METImage) and the Multi-viewing Multi-channel Multi-polarisation Imager (3MI).
Compared to GOME-2, the major breakthrough of Sentinel-5 will be a drastically increased spatial sampling at a sampling distance of 7km, and the extension of measurements into the near and short-wave infrared, providing information about aerosols, as well as methane and carbon monoxide in the planetary boundary layer.
UVNS characteristics
Hyper-spectral soundings with a spectral resolution from 0.065–1nm in the wavelength range from 0.27–2.4385µm, at a spatial sampling of 7km for channels above 0.3µm.
| Band ID | Spectral Range (nanometres) | Spectral resolution Δλ (nanometres) | Spectral oversampling factor | SNR(1, 2) @ Lref |
|---|---|---|---|---|
| UV-1 | 270-300 | 1.0 | 3 | 100 @ 270nm |
| UV-2 | 300-370 | 0.5 | 3 | T: 1000 @ 320nm O: 1000 @ 310nm |
| VIS | 370–500 | 0.5 | 3 | 1500(3) @ 420nm, for λ < 430nm 1800 (T) / 2500 (O) @ 460nm for 430nm < λ < 460nm(4) 1500 @ 460nm for λ > 460nm |
| NIR-1 | 685–710 710–750 |
0.4(T)/0.2(O) 0.4(T)/0.2(O) |
3 3 |
500 @ 710nm 500 @ 750nm |
| NIR-2 | 750-775 | 0.4(T)/0.06(O) | 3 | 500 @755nm |
| SWIR-1 | 1590-1675 | 0.25 | 3 | 250(5) @ λmax-SWIR1 |
| SWIR-3 | 2305-2385 | 0.25 | 3 | T: 120(5) @ λmax-SWIR3 O: 100(5,6) @ λmax-SWIR3 |
T — Threshold requirement, O — Objective requirement, λ — spectral channel centre of any spectral channel within the band, Lref — spectral radiance for estimating the signal-to-noise-ratio
The instrument is a pushbroom imaging spectrometer, directly imaging the entrance slit onto the Earth's surface.
