Data Currently Available
The data are freely available at the NASA Langley Data Analysis and Archive Center (DAAC). Data include: Level 0: Raw output data from the instrument supplemented by time, spacecraft position and attitude information. Level 1 (MOP01 files): Calibrated radiances (average and difference signals) from the instrument, with location and time information. Level 2 (MOP02 files): Retrievals. CO mixing ratio profiles with 22 km horizontal resolution, output on 10 levels in the troposphere, 10% precision. CO total column with 10% precision. Level 3 (MOP03 files): Gridded global CO distributions: 1 deg x 1 deg, daily and monthly averages. (not available yet)
Detailed Data Description- Langley DAAC through any of the following links: Data via the Langley DAAC EOS Terra MOPITT Data Products Terra data via the EOSDIS Data Gateway
Satellite Instruments
Measurements Of Pollution In The Troposphere The MOPITT instrument, on the NASA EOS Terra satellite, measures the upwelling infrared radiance in 1 band in the thermal IR and 2 in the Near-IR. Using the technique of correlation spectroscopy discussed elsewhere, it was planned to recover information on the distributions of atmospheric CO and methane. By using appropriate retrieval algorithms, information on the total column amount of CO, and some information on the difference between upper and lower tropospheric concentration is obtained on a global basis and presented as vertical profiles on 10 levels, at a horizontal resolution of 22km. The present data is version 4 (V4). Because of the variations of surface reflectivity in the methane spectral band, it was not possible to recover column amounts of methane to the required precision of ≤1%. MOPITT is the first satellite sensor to use gas correlation spectroscopy to obtain long term measurements of a tropospheric trace gas. The sensor measures emitted and reflected radiance from the Earth in three spectral bands. As this light enters the sensor, it passes along two different paths through onboard containers of carbon monoxide and methane. The different paths absorb different amounts of energy, leading to small differences in the resulting signals that correlate with the presence of these gases in the atmosphere. MOPITT's spatial resolution is 22 km at nadir; it scans across the satellite flight track +/- 26.1 deg in 13 secs, resulting in swaths that are 640 km wide. The CO profiles have been assimilated into models to study the chemistry and dynamics of CO, and other constituents of the lower atmosphere. The measurements of CO permit the gas to be tracked back to its sources.
John Gille
Boulder, CO
Merritt N. Deeter
The National Center for Atmospheric Research
Atmospheric Chemistry Division 3450 Mitchell Lane Boulder, Colorado 80301
(303) 497-8063
Measurment TypeVisible/IR-sounder
Platform TypeEOS Terra
OrbitSun synchronous
Spectral CoverageInfrared
Scan PatternNadir
VariablesCO, methane,
Repeat Time
Wavelength2166 to 4430wave number
Number of Bands8 - 4 at 2166 wvn, 2 at 4285 wvn, 2 at 4430 wvn
Start DateMar 2000
Temporal CoverageDaily
Swath Width640 km l
Resolution 122km
Resolution 222km
Resolution 38 (vertical)km
REFERENCES publications -
13 Oct 2009 08:20