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Instrument: MOPITT : Measurements Of Pollution In The Troposphere
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Associated Platforms

Spectral/Frequency Information
Number Channels: 8
Spectral/Frequency Coverage/Range: 4.7 m, 2.4 m, 2.3 m

Related Data Sets
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The objective of the Measurement of Pollution in the Troposphere (MOPITT) spectrometer is to measure emitted and reflected infrared radiance in the atmospheric column to permit retrieval of tropospheric carbon monoxide (CO) profiles and total column methane. Observations of CO and methane will be used to study how these gases interact with the surface, ocean, and biomass systems. The MOPITT instrument is bases on the principle of correlation spectroscopy utilizing both pressure-modulated and length-modulated gas cells, with detectors at 2.3, 2.4, and 4.7 micrometer. Atmospheric profiles of CO are measured with the 4.7 micrometer detector. CO and methane are measured by the 2.4 and 2.3 micrometer channels, respectively, sense solar radiation reflected from the surface. The MOPITT is a scanning instrument with a field-of-view of 1.8 degrees (22-km footprint at nadir). The scan line consists of 28 pixels, each at 1.8 degree increments with a maximum scan angle of 25.2 degrees off-axis (swath width of 620-km). MOPITT data products are expected to include gridded retrievals of methane with a horizontal resolution of 120 km at 1 % accuracy and gridded CO soundings with 10 % accuracy in three vertical layers between 0 and 15 km. The MOPITT instrument was launched on the NASA Earth Observing System (EOS) Terra spacecraft on December 18, 1999.

Key MOPITT Facts:
Joint with Canada
Heritage: Measurement of Air Pollution from Satellites (MAPS), Pressure
Modulator Radiometer (PMR), Stratospheric and Mesospheric Sounder
(SAMS), and Improved Stratospheric and Mesospheric Sounder (ISAMS) instruments
Instrument Type: Eight-channel radiometer
CO Concentration Accuracy: 10%
CH4 Column Abundance Accuracy: 1%
Swath: 640 km (29 fields of view)
Spatial Resolution (each pixel):
22 km ? 22 km (at nadir)
Dimensions: 115 cm x 93 cm x 57 cm (stowed), 115 cm x 105 cm x 71 cm (deployed)
Mass: 192 kg
Power: 250 W (average), 260 W (peak)
Duty Cycle: 100%
Data Rate: 28 kbps
Thermal Control: 80 K Stirling-cycle cooler, capillary-pumped cold plate and
passive radiation
Thermal Operating Range: 25C (instrument), 100 K (detectors)
Instrument IFOV: 22 km across track,
88 km along track (1.8 x 7.2 x 4 pixels)
Spectral Range: Correlation spectroscopy utilizing both pressure and
length-modulated gas cells, with detectors at 2.3, 2.4, and 4.7 m
Direct Broadcast: No; Rapid Response processing available
Prime Contractor: COM DEV
The Canadian Space Agency provided the instrument

[Summary provided by NASA]

Online Resources

Instrument Logistics
Data Rate: 28 kbps
Instrument Start Date: 1999-12-18
Instrument Owner: Canada/CSA