BackForwardInstrument:  Sentinel-4 

Instrument details
Acronym Sentinel-4
Full name UVN: Ultra-violet, Visible and Near-infrared sounder
Purpose Frequent observation of BrO, HCHO, NO2, O3, SO2 and aerosol; also cloud top height
Short description Grating spectrometers covering the UV, VIS and NIR spectral bands [see detailed characteristics below]
Background Embarking Sentinel-4 on Meteosat Third Generation implements the Sentinel-4 component of Copernicus, the European Commission's Earth Observation Programme, previously known as GMES (Global Monitoring for Environment and Security)
Scanning Technique Mechanical, 3-axis stabilised satellite, E-W continuous, S-N stepping
Resolution Defined at 45°N, 0°: < 10 km in both N/S and E/W directions
Coverage / Cycle European area (lat. 30-65°N, long. 15°W to 50°E) in 60 min (possibly 30 min)
Mass 150 kg Power 100 W Data Rate 25 Mbps

 

Providing Agency ESA
Instrument Maturity Demonstrated by simulations
Utilization Period: ≥2023 to ≥2039
Last update: 2017-03-29
Detailed characteristics
Spectral ranges Number of channels Spectral resolution SNR at specified input spectral radiance
305-400 nm 600 0.5 nm 200-1400 @ 40-120 W m-2 sr-1 μm-1
400-500 nm 600 0.5 nm 1400 @ 140 W m-2 sr-1 μm-1
755-775 nm 300 0.2 nm 1200 @ 60 W m-2 sr-1 μm-1
Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Instrument classification
  • Earth observation instrument
  • Passive optical radiometer or spectrometer
  • Cross-nadir shortwave (UV/VIS) sounder
Mission objectives
Primary mission objectives
  • BrO
  • ClO
  • H2O
  • HCHO
  • HCHO (Total Column)
Show allShow fewer
Tentative Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
VariableRelevance for measuring this variableOperational limitationsExplanation
Aerosol column burden3 - highCloud sensitive.. Daylight only.UV (for absorbing aerosol), VIS and NIR spectrometry including the 760 nm band for high-level aerosol
Aerosol effective radius5 - marginalCloud sensitive.. Daylight only.UV, VIS and NIR spectrometry including the 760 nm band for high-level aerosol
Aerosol mass mixing ratio4 - fairCloud sensitive.. Daylight only.UV (for absorbing aerosol),, VIS and NIR spectrometry including the 760 nm band for high-level aerosol
Aerosol Optical Depth3 - highCloud sensitive.. Daylight only.UV, VIS and NIR spectrometry including the 760 nm band for high-level aerosol
Aerosol type4 - fairCloud sensitive.. Daylight only.UV (for absorbing aerosol), VIS and NIR spectrometry including the 760 nm band for high-level aerosol
BrO3 - highCloud sensitive.. Daylight only.UV spectrometry. BrO lines around 300 nm. Frequent sampling (GEO) enables monitoring diurnal variations
HCHO 3 - highCloud sensitive.. Coarse vertical resolution.. Daylight only.UV spectrometry. HCHO lines around 350 nm. Frequent sampling (GEO) enables monitoring diurnal variations
HCHO (Total Column)3 - highCloud sensitive.. Daylight only.UV spectrometry. HCHO lines around 350 nm. Frequent sampling (GEO) enables monitoring diurnal variations
ClO3 - highCloud sensitive.. Daylight only.UV Spectrometry. ClO lines around 300 nm Frequent sampling (GEO) enables monitoring diurnal variations
Cloud cover4 - fairDaylight only.VIS and NIR spectroscopy
Cloud drop effective radius4 - fairAt cloud top.. Daylight only.VIS and NIR spectrometry
Cloud ice effective radius4 - fairAt cloud top.. Daylight only.VIS and NIR spectrometry
Cloud optical depth3 - highLow-density cloud only.. Daylight only.VIS and NIR spectrometry
Cloud top height4 - fairDaylight only.NIR spectrometry to estimate the total-column O2 above the cloud top as measured around 760 nm
Downward short-wave irradiance at Earth surface4 - fairCloud sensitive.. Highly indirect.. Daylight only.VIS and NIR spectrometry
Earth surface short-wave bidirectional reflectance4 - fairCloud sensitive.VIS and NIR spectrometry. GEO sees changing solar incidence angles as daylight progresses
H2O2 - very highCloud sensitive.. Daylight only.Spectrometry in UV and VIS (several weak bands), and NIR (strong band around 940 nm). Frequent sampling (GEO) for diurnal variations
NO3 - highCloud sensitive.. Coarse vertical resolution.. Daylight only.UV spectrometry. NO lines around 250 nm. Frequent sampling (GEO) enables monitoring diurnal variations
NO23 - highCloud sensitive.. Coarse vertical resolution.. Daylight only.UV and VIS spectrometry. Several lines in the ranges around 220 nm and 400 nm. Frequent sampling (GEO) enables monitoring diurnal variations
NO2 (Total column)3 - highCloud sensitive.. Daylight only.UV and VIS spectrometry. Several NO2 lines. Frequent sampling (GEO) enables monitoring diurnal variations
O32 - very highCloud sensitive.. Daylight only.UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis). GEO enabling frequent sampling (GEO) for diurnal variations
O3 (Total column)1 - primaryCloud sensitive.. Daylight only.UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis). GEO enabling frequent sampling (GEO) for diurnal variations
PSC occurrence3 - highCoarse vertical resolution.. Daylight only.UV and VIS spectrometry
Short-wave cloud reflectance5 - marginalNo specific limitation.VIS and NIR spectrometry. Unsuitable dynamic range (saturation)
SO23 - highCloud sensitive.. Coarse vertical resolution.. Daylight only.UV spectrometry. SO2 lines around 350 nm. Frequent sampling (GEO) for sources monitoring
SO2 (Total column)3 - highCloud sensitive.. Daylight only.UV spectrometry. SO2 lines around 350 nm. Frequent sampling (GEO) for sources monitoring
Upward short-wave irradiance at TOA2 - very highSpectral interpolation needed.UV, VIS and NIR spectrometry with changing solar incidence angles as daylight progresses
Upward spectral radiance at TOA4 - fairMissing SWIR and all Long-waves.UV, VIS and NIR spectrometry
Aerosol volcanic ash4 - fairCloud sensitive.. Daylight only.UV (specifically sensitive to ash), VIS and NIR spectrometry including the 760 nm band for high-level ash
Aerosol volcanic ash (Total column)2 - very highCloud sensitive.. Daylight only.UV (specifically sensitive to ash), VIS and NIR spectrometry including the 760 nm band for high-level ash. Frequent sampling (GEO) for early detection of ash plumes