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ATMOS L2 Trace Gases on Altitude Grid, Fixed Field Format V3 (ATMOSL2AF) at GES DISC

Published by NASA/GSFC/SED/ESD/TISL/GESDISC | National Aeronautics and Space Administration | Catalog Last Checked: May 26, 2026 at 06:41 PM | Dataset Last Updated: May 18, 2026
This is the version 3 Atmospheric Trace Molecule Spectroscopy (ATMOS) Level 2 product containing trace gases on a vertical altitude (km) grid with data stored in an ASCII table using a FORTRAN friendly fixed field format. ATMOS is an infrared spectrometer (a Fourier transform interferometer) designed to derive vertical concentrations of various trace gases in the atmosphere, particularly the ozone depleting chlorine and fluorine based molecules. Measured species include: H2O, CO2, O3, N2O, CO, CH4, NO and NO2 (both diurnally and not diurnally corrected), HNO3, HF, HCl, OCS, H2CO, HOCl, H2O2, HO2NO2, N2O5, ClONO2, HCN, CH3F, CH3Cl, CF4, CCl2F2, CCl3F, CCl4, COF2, C2H6, C2H2, N2, CHF2Cl, HCOOH, HDO, SF6 and CH3D reported at 100 levels from 0.5 to 99.5 km. Data files also include time, geolocation and other information. The data were collected during four space shuttle missions: STS-51B/Spacelab 3 (April 30 to May 1, 1985), STS-45/ATLAS-1 (March 25 to April 2, 1992), STS-55/ATLAS-2 (April 8 to 16, 1993), and STS-66/ATLAS-3 (November 3 to 12, 1994). Data are written to separate files grouped by mission (sl3, at1, at2 or at3), and occultation type (sunrise or sunset) and number. A similar product (ATMOSL2AT) exists that contains these same data in a spreadsheet friendly tab delimited format.

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earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-acetylene earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-atmospheric-car earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-ethane earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-formaldehyde earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-formic-acid earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-hydrogen-cyanid earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-methane earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-carbon-tetrachloride

Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
                                            [
  "026:00"
]
contactPoint 
                                            {
  "fn": "Earthdata Forum",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:earthdata-support@nasa.gov"
}
description This is the version 3 Atmospheric Trace Molecule Spectroscopy (ATMOS) Level 2 product containing trace gases on a vertical altitude (km) grid with data stored in an ASCII table using a FORTRAN friendly fixed field format. ATMOS is an infrared spectrometer (a Fourier transform interferometer) designed to derive vertical concentrations of various trace gases in the atmosphere, particularly the ozone depleting chlorine and fluorine based molecules. Measured species include: H2O, CO2, O3, N2O, CO, CH4, NO and NO2 (both diurnally and not diurnally corrected), HNO3, HF, HCl, OCS, H2CO, HOCl, H2O2, HO2NO2, N2O5, ClONO2, HCN, CH3F, CH3Cl, CF4, CCl2F2, CCl3F, CCl4, COF2, C2H6, C2H2, N2, CHF2Cl, HCOOH, HDO, SF6 and CH3D reported at 100 levels from 0.5 to 99.5 km. Data files also include time, geolocation and other information. The data were collected during four space shuttle missions: STS-51B/Spacelab 3 (April 30 to May 1, 1985), STS-45/ATLAS-1 (March 25 to April 2, 1992), STS-55/ATLAS-2 (April 8 to 16, 1993), and STS-66/ATLAS-3 (November 3 to 12, 1994). Data are written to separate files grouped by mission (sl3, at1, at2 or at3), and occultation type (sunrise or sunset) and number. A similar product (ATMOSL2AT) exists that contains these same data in a spreadsheet friendly tab delimited format.
distribution 
                                            [
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identifier 10.5067/ATMOS/DATA2002
keyword 
                                            [
  "earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-acetylene",
  "earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-atmospheric-car",
  "earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-ethane",
  "earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-formaldehyde",
  "earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-formic-acid",
  "earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-hydrogen-cyanid",
  "earth-science-atmospheric-chemistry-atmosphere-carbon-and-hydrocarbon-compounds-methane",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-carbon-tetrachloride",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-carbon-tetrafluoride",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-carbonyl-fluoride",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-chlorine-nitrate",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-chlorofluorocarbons--11",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-chlorofluorocarbons--12",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-hydrochlorofluorocar-22",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-hydrogen-chloride",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-hydrogen-fluoride",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-hypochlorous-acid",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-methyl-chloride",
  "earth-science-atmospheric-chemistry-atmosphere-halocarbons-and-halogens-methyl-fluoride",
  "earth-science-atmospheric-chemistry-atmosphere-hydrogen-compounds-hydrogen-deuterium-oxide",
  "earth-science-atmospheric-chemistry-atmosphere-nitrogen-compounds-atmospheric-nitric-acid",
  "earth-science-atmospheric-chemistry-atmosphere-nitrogen-compounds-dinitrogen-pentoxide",
  "earth-science-atmospheric-chemistry-atmosphere-nitrogen-compounds-nitric-oxide",
  "earth-science-atmospheric-chemistry-atmosphere-nitrogen-compounds-nitrogen",
  "earth-science-atmospheric-chemistry-atmosphere-nitrogen-compounds-nitrogen-dioxide",
  "earth-science-atmospheric-chemistry-atmosphere-nitrogen-compounds-nitrous-oxide",
  "earth-science-atmospheric-chemistry-atmosphere-nitrogen-compounds-peroxynitric-acid",
  "earth-science-atmospheric-chemistry-atmosphere-oxygen-compounds-atmospheric-ozone",
  "earth-science-atmospheric-chemistry-atmosphere-oxygen-compounds-hydrogen-peroxide",
  "earth-science-atmospheric-chemistry-atmosphere-sulfur-compounds-carbonyl-sulfide",
  "earth-science-atmospheric-chemistry-atmosphere-sulfur-compounds-sulfur-hexafluoride",
  "earth-science-atmospheric-water-vapor-atmosphere-water-vapor-indicators-water-vapor"
]
license https://www.usa.gov/government-works
modified 2026-05-18
programCode 
                                            [
  "026:000"
]
publisher 
                                            {
  "name": "NASA/GSFC/SED/ESD/TISL/GESDISC",
  "@type": "org:Organization"
}
spatial 
                                            "["CARTESIAN",[{"WestBoundingCoordinate":-180,"NorthBoundingCoordinate":75,"EastBoundingCoordinate":180,"SouthBoundingCoordinate":-73}]]"
temporal 1985-04-30/1985-05-01
theme 
                                            [
  "Earth Science"
]
title ATMOS L2 Trace Gases on Altitude Grid, Fixed Field Format V3 (ATMOSL2AF) at GES DISC

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