Sentinel-5 is the polar-orbiting atmospheric monitoring mission, which will provide operational monitoring of trace gas concentrations for atmospheric chemistry and climate applications.
The objectives of the Sentinel-5 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 7 km, 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.
Hyper-spectral soundings with a spectral resolution from 0.065–1 nm in the wavelength range from 0.27–2.4385 µm, at a spatial sampling of 7 km for channels above 0.3 µm.
|Band ID||Spectral Range (nanometres)||Spectral resolution Δλ (nanometres)||Spectral oversampling factor||SNR(1, 2) |
|UV-1||270-300||1.0||3||100 @ 270 nm|
|UV-2||300-370||0.5||3||T: 1000 @ 320 nm |
O: 1000 @ 310 nm
|VIS||370–500||0.5||3||1500(3) @ 420 nm, for λ < 430 nm |
1800 (T) / 2500 (O) @ 460 nm for 430 nm < λ < 460 nm(4)
1500 @ 460 nm for λ > 460 nm
|500 @ 710 nm |
500 @ 750 nm
|NIR-2||750-775||0.4(T)/0.06(O)||3||500 @755 nm|
|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.