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Instrument details
Acronym
CO2I and NO2I
Full name
Combined Carbon Dioxide and Nitrogen Dioxide Imager
Purpose
Measurement of CO2 and NO2 concentration to monitor anthropogenic carbon emissions
Short description
Set of VIS/NIR/SWIR grating spectrometers covering four spectral ranges, to measure CO2 Total column with high precision (< 0.7 ppm) and low systematic bias (< 0.5 ppm). Supporting NO2 Total column observation provided by the VIS component (Blue) [See details below].
Background
Operating in association with a cloud imager (CLIM) and a multi-angle polarimeter (MAP).
Scanning Technique
Cross-track pushbroom scanning. Swath 256 km.
Resolution
0.8 km at SSP.
Coverage / Cycle
Near-global coverage in 10 days.
Mass
Power
Data Rate
Providing Agency
ESA
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
≥2026 to ≥2031
Last update:
2021-12-13
Detailed characteristics
The CO2 & N2OI imager (CO2I), consisting of four spatially nadir viewing co-registered push-broom imaging spectrometers, measuring spectral radiance and solar irradiance in the VIS, NIR and SWIR wavelengths at moderate spectral resolving power (R=5000-7000).
Spectral
band
Spectral
range
Spectral
resolution
SNR @ specified input
spectral radiance
VIS
405 - 490 nm
0.6 nm
…. @ … W m-2 sr-1 μm-1
NIR
747 - 773 nm
0.12 nm
... @ … W m-2 sr-1 μm-1
SWIR1
1590 - 1675 nm
0.30 nm
... @ … W m-2 sr-1 μm-1
SWIR2
1990 - 2095 nm
0.35 nm
… @ … 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
WIGOS Subcomponents
Subcomponent 3 NIR spectrometer
Mission objectives
Primary mission objectives
Secondary mission objectives
Opportunity objectives Cloud cover Cloud drop effective radius Cloud ice effective radius Cloud optical depth Cloud top height Downward short-wave irradiance at Earth surface Short-wave cloud reflectance Show all Show 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
Variable Relevance for measuring this variable Operational limitations Explanation
Cloud cover 4 - fair Daylight only. VIS, NIR and SWIR spectroscopy
Cloud drop effective radius 4 - fair At cloud top.. Daylight only. VIS, NIR and SWIR spectrometry
Cloud ice effective radius 4 - fair At cloud top.. Daylight only. VIS, NIR and SWIR spectrometry
Cloud optical depth 2 - very high Low-density cloud only.. Daylight only. VIS, NIR and SWIR spectrometry
Cloud top height 4 - fair Daylight only. NIR spectrometry to estimate the total-column O2 above the cloud top as measured around 760 nm
CO2 3 - high Cloud sensitive.. Coarse vertical resolution.. Daylight only. SWIR spectrometry. CO2 lines around 1.6 and 2.1 micrometers
Downward short-wave irradiance at Earth surface 1 - primary Cloud sensitive.. Highly indirect.. Daylight only. VIS, NIR and SWIR spectrometry
NO2 Total Column 4 - fair Daylight only.. Cloud sensitive. VIS spectrometry in the blue range (400-500 nm)
Short-wave cloud reflectance 3 - high No specific limitation. VIS, NIR and SWIR spectrometry. Unsuitable dynamic range (saturation)
Instrument: CO2I and NO2I