MAPS Level 2
Entry Title: Measurement of Air Pollution from Satellites (MAPS) Office of Space and Terrestrial Applications - 3 (OSTA3) Carbon Monoxide Second by Second data

Entry ID: MAPS_OSTA3_COSEC_HDF_1
Tropospheric Composition
Description

MAPS Overview The MAPS experiment measures the global distribution of carbon monoxide (CO) mixing ratios in the free troposphere. Because of MAPS' previous flights on board the Space Shuttle, Earth system scientists now know that carbon monoxide concentrations in the troposphere are highly variable around the planet, and that widespread burning in the South American Amazon Basin and southern cerrados, the African savannahs,and the Australian grasslands and ranches are major sources of carbon monoxide in the southern hemisphere and tropical troposphere.InstrumentThe MAPS instrument is based on a technique called gas filter radiometry. Thermal energy from the Earth passes through the atmosphere and enters the viewport of the downlooking MAPS instrument. Carbon monoxide and nitrous oxide (N2O) in the atmosphere produce unique absorption lines in the transmitted energy. The energy which enters the MAPS instrument is split into three beams. One beam passes through a cell containing CO and falls onto a detector. This CO gas cell acts as a filter for the effects of CO present in the middle troposphere. A second beam falls directly onto a detector without passing through any gas filter. The difference in the voltage of the signals from these two detectors can be used to determine the amount of CO present in the atmosphere at an altitude of 7-8 km. A third beam of the incident energy passes through a cell containing N2O and falls onto a detector. This N2O gas cell acts as a filter for the effects of N2O present in the atmosphere. The global distribution of N2O is well known, so the N2O signal can be used to detect the presence of clouds in the field of view and to correct the simultaneous CO measurement for systematic errors in the data.The data that are available from MAPS OSTA3 include a 5 by 5 degree gridded box (MAPS_OSTA3_5X5_HDF) and a second by second data product (MAPS_OSTA3_COSEC_HDF). These data sets are available from the Langley DAAC.

DOI

10.5067/MAPS_OSTA3_COSEC_HDF

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Keywords

From GCMD Science Keywords:
  • CARBON MONOXIDE
  • CARBON DIOXIDE > CARBON AND HYDROCARBON COMPOUNDS
  • Large-Scale Biosphere-Atmosphere (LBA)
Data Distribution

File Format(s):

Native

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Spatial Information

spatial-coverage-map
Spatial Coverage: (-70, 70), (-180, 180)
Spatial Coverage Type: Horizontal
Coordinate System: Cartesian
Granule Spatial Representation: Geodetic
Locations

TROPOSPHERE
Temporal Information

Temporal Coverage: 1984-10-06 - 1984-10-13
Temporal Resolution: 1 second
Platforms

Space Stations/Manned Spacecraft
STS-41G
Space Transport System STS-41G
GFC RADIOMETER
Gas Filter Correlated Radiometer
MAPS
Measurement of Air Pollution from Satellite
SPACE SHUTTLES
Instruments not applicable.
Metadata Dates

Created on 1999-07-07
Last updated on 2018-02-06