THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
Measurements > Atmosphere >
Trace gases (excluding ozone) >
Atmospheric Chemistry - CO2 (column/profile)


Measurement Definition*: CO2 = Carbon dioxide. Requested from surface to TOA (layers: LT, HT, LS, HS&M) + Total column - Physical unit: [ ppm ] - Accuracy unit: [ % ].
InstrumentStatus/
Accuracy
Instrument DescriptionMeasurement TechnologyTimeline
ACE-FTS
Atmospheric Chemistry Experiment (ACE) Fourier Transform Spectrometer
Operational
+/-10 ppm
Measure and understand the chemical processes that control the distribution of ozone in the Earth's atmosphere, especially at high altitudes.Limb-scanning IR spectrometer
ACGS
Atmospheric Carbon dioxide Grating Spectrometer
Operational
+/-4 ppm
CO2 monitoring.n/a
AIRS
Atmospheric Infra-red Sounder
Operational
+/-1.5 ppm
High spectral resolution measurement of temperature and humidity profiles in the atmosphere. Long-wave Earth surface emissivity. Cloud diagnostics. Trace gas profiles. Surface temperatures.n/a
CrIS
Cross-track Infrared Sounder
Operational
+/-2 ppm
Daily measurements of vertical atmospheric distribution of temperature, moisture, and pressure.n/a
GAS
Greenhouse gases Absorption Spectrometer
Operational
Measures greenhouse gases.High-resolution nadir-scanning SW spectrometer
IASI
Infrared Atmospheric Sounding Interferometer
Operational
+/-2 ppm
Measures tropospheric moisture and temperature, column integrated contents of ozone, carbon monoxide, methane, nitrous oxide and other minor gases which affect tropospheric chemistry. Also measures sea surface and land temperature.n/a
Spectrometer (OCO-2)
Spectrometer (OCO-2)
Operational
+/-1 ppm
Global measurements of atmospheric CO2 needed to describe the variability of CO2 sources and sinks.High-resolution nadir-scanning SW spectrometer
TANSO-FTS
Thermal And Near infrared Sensor for carbon Observation - Fourier Transform Spectrometer
Operational
+/-2 ppm
CO2 and CH4 distribution.High-resolution nadir-scanning IR spectrometer
TANSO-FTS-2
Thermal And Near infrared Sensor for carbon Observation - Fourier Transform Spectrometer-2
Operational
CO2, CH4, and CO distribution.High-resolution nadir-scanning IR spectrometer
Microcarb
Microcarb
Being developed
Measurement of CO2 concentration using CO2 absorption bands at 1607nm and 2046nmHigh-resolution nadir-scanning SW spectrometer
Scanning Spectrometer (GeoCarb)
Scanning Spectrometer (GeoCarb)
Being developed
+/-1 ppm
GeoCarb Mission employs a 4-channel slit imaging spectrometer that measures reflected IR sunlight at wavelengths 1.61µm and 2.06µm for XCO2, and 2.32µm for XCH4 and XCO. The fourth channel, 0.76µm, measures O2 column concentration and SIF, and it also provides valuable information on aerosol and cloud contamination. The North/South (N/S) extent of the scan is fixed at a 4.4° field of view, which maps to 25° latitude or 2800 km at the Sub-Satellite Point (SSP). There are 1016 N/S samples with 4.1 km spatial resolution, spaced 2.7 km apart on center. The measurements are acquired in an East to West (E/W), 0.3825s step, and 4.08s stare (integration) mode, with 3 km sampling EW steps and 5.4 km resolution at SSP.High-resolution nadir-scanning SW spectrometer
Spectrometer (OCO-3)
Spectrometer (OCO-3)
Being developed
+/-1 ppm
Global measurements of atmospheric CO2 needed to describe the variability of CO2 sources and sinks.High-resolution nadir-scanning SW spectrometer
CO2 and O2 LIDAR (ASCENDS)
Combined CO2 and O2 column absorption LIDAR (ASCENDS)
Proposed
+/-1 ppm
Measure the number density of Carbon Dioxide (CO2) in the column. Measure length of the column using a laser altimeter and measure ambient air pressure and temperature.n/a
TANSO-FTS-3
Thermal And Near infrared Sensor for carbon Observation - Fourier Transform Spectrometer-3
Proposed
CO2, CH4, and CO distribution. High-resolution nadir-scanning IR spectrometer
TGSP
Trace Gas Spectrometer
Proposed
Trace gas measurements.n/a
HIRS/4
High Resolution Infra-red Sounder/4
No longer operational
+/-4 ppm
Atmospheric temperature profiles and data on cloud parameters, humidity soundings, water vapour, total ozone content, and surface temperatures. Same as HIRS/3, with 10 km IFOV.n/a
IRAS
InfraRed Atmospheric Sounder
No longer operational
+/-2 ppm
Atmospheric sounding for weather forecasting.n/a
TES
Tropospheric Emission Spectrometer
No longer operational
+/-1.3 ppm
3D profiles on a global scale of all infra-red active species from surface to lower stratosphere. Measures greenhouse gas concentrations, tropospheric ozone, acid rain precursors, gas exchange leading to stratospheric ozone depletion.High-resolution nadir-scanning IR spectrometer
* Description adapted from WMO.
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