THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
Measurements > Atmosphere >
Trace gases (excluding ozone) >
Atmospheric Chemistry - CH4 (column/profile)


Measurement Definition*: CH4 = Methane. 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
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
AIRS
Atmospheric Infra-red Sounder
Operational
+/-1.2 %
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
IASI
Infrared Atmospheric Sounding Interferometer
Operational
+/-0.9 %
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
IKFS-2
IR-Fourier spectrometer
Operational
Atmospheric temperature/humidity profiles, data on cloud parameters, water vapour & ozone column amounts, surface temperature.High-resolution nadir-scanning IR spectrometer
OMI
Ozone Measuring Instrument
Operational
Mapping of ozone columns, key air quality components (NO2, SO2, BrO, OClO and aerosols), measurements of cloud pressure and coverage, global distribution and trends in UV-B radiation.High-resolution nadir-scanning SW spectrometer
TANSO-FTS
Thermal And Near infrared Sensor for carbon Observation - Fourier Transform Spectrometer
Operational
+/-0.5 %
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
UVNS (Sentinel-5 precursor)
TROPOMI
Operational
+/-2 %
Supporting atmospheric composition and air quality monitoring services.High-resolution nadir-scanning SW spectrometer
IPDA LIDAR
Integrated Path Differential Absorption Light Detection and Ranging Instrument
Being developed
+/-2 %
'Active' optical remote sensing instrument for atmospheric parameters or trace gases. Global information on atmospheric Methane concentration (Methane column density measurements).n/a
Scanning Spectrometer (GeoCarb)
Scanning Spectrometer (GeoCarb)
Being developed
+/-0.01 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
UVNS (Sentinel-5)
Ultra-violet Visible Near-infrared Shortwave-infrared spectrometer
Being developed
+/-2 %
Supporting atmospheric composition and air quality monitoring services. Measurements of atmospheric trace gases, primarily O3, NO2, SO2, HCHO, CH4 and CO.High-resolution nadir-scanning SW spectrometer
UVN
UV-VIS-NIR Sounder
Approved
Measurements of atmospheric trace gases, mainly O3, NO2, SO2, H2CO. The product list is not yet approved, the accuracy summary column lists the breakthrough user requirements.High-resolution nadir-scanning SW spectrometer
IKFS-3
Advanced Fourier spectrometer
Proposed
Atmospheric temperature/humidity profiles, data on cloud parameters, water vapour & ozone column amounts, surface temperature.High-resolution nadir-scanning IR spectrometer
IR Correlation Radiometer (GeoCape)
IR Correlation Radiometer (GeoCape)
Proposed
+/-1 %
The near-IR and thermal-IR data will describe vertical CO, an excellent tracer of long-range transport of pollution. Identifying large scale vegetation burning events. Characterizing the oxidizing capacity of the atmosphere.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
HiRDLS
High Resolution Dynamics Limb Sounder
No longer operational
+/-1 %
Measures atmospheric temperature, concentrations of ozone, water vapour, methane, NOx, N2O, CFCs and other minor species, aerosol concentration, location of polar stratospheric clouds and cloud tops. Currently not collecting data on Aqua.Limb-scanning IR spectrometer
TES
Tropospheric Emission Spectrometer
No longer operational
+/-0.7 %
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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