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Description

The Aura Ozone Monitoring Instrument (OMI) collection-3 Chlorine Dioxide Product OMOCLO is now available from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) for public access. The shortname for this Level-2 OMI total column OClO product is OMOCLO. The algorithm leads for this product are the US OMI scientists Dr. Kelly Chance and Dr. Thomas Kurosu from the Harvard-Smithsonian Center, Cambridge, MA. The OMOCLO product contains slant column OClO, standard errors (rms and sigma), quality flags, geolocation and other ancillary information.

The OMOCLO files are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5). Each file contains data from the day lit portion of an orbit (~53 minutes). There are approximately 14 orbits per day. The maximum file size for the OMOCLO data product is about 20 MB.

Product Summary

Platforms
Aura
Instruments
OMI
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2004-10-01 to Present
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C1239966829-GES_DISC
Data State
ACTIVE
Number of Files/Granules
111779
Processing Level
2
Published
Updated
Science Keywords
Chlorine Dioxide

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Chance, K. (2007). OMI/Aura Chlorine Dioxide (OClO) Total Column 1-orbit L2 Swath 13x24 km [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA2019 Date Accessed: 2025-12-13

Documents

READ-ME

PI DOCUMENTATION

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

PRODUCT HISTORY

PUBLICATIONS

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/AirMassFactor Molecule Specific Air Mass Factor (AMF) NoUnits float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/AirMassFactorDiagnosticFlag Diagnostic Flag for Molecule Specific AMF NoUnits int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/AirMassFactorGeometric Geometric Air Mass Factor (AMF) NoUnits float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/AverageColumnAmount Average Column Amount molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/AverageColumnUncertainty Average Column Uncertainty molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/AverageFittingRMS Average Fitting RMS NoUnits float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/ColumnAmount Column Amount molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/ColumnAmountDestriped Column Amount with Destriping Correction molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/ColumnUncertainty Column Uncertainty molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/FitConvergenceFlag Fitting Convergence Flag NoUnits int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/FittingRMS Fitting RMS NoUnits float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/MainDataQualityFlag Main Data Quality Flag NoUnits int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/MaximumColumnAmount Maximum Column Amount for QA Flag 'good' molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/PixelArea Pixel Area km^2 float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/PixelCornerLatitudes Pixel Corner Latitude Coordinates deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/PixelCornerLongitudes Pixel Corner Longitude Coordinates deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceReferenceColumnAmount Radiance Reference Fit Colunm Amount molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceReferenceColumnUncertainty Radiance Reference Fit Colunm Uncertainty molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceReferenceColumnXTRFit Radiance Reference Fit Colunm XTR Fit molec/cm2 float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceReferenceConvergenceFlag Radiance Reference Fit Convergence Flag NoUnits int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceReferenceFittingRMS Radiance Reference Fit RMS NoUnits float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceReferenceLatitudeRange Radiance Reference Fit Latitude Range NoUnits float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceWavCalConvergenceFlag Radiance Wavelength Calibration Convergence Flag NoUnits int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/RadianceWavCalLatitudeRange Radiance Wavelength Calibration Latitude Range NoUnits float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Data Fields/SolarWavCalConvergenceFlag Solar Wavelength Calibration Convergence Flag NoUnits int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/Latitude Geodetic Latitude deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/Longitude Geodetic Longitude deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/SolarAzimuthAngle Solar Azimuth Angle deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/SolarZenithAngle Solar Zenith Angle deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/SpacecraftAltitude Altitude of Aura Spacecraft m float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/TerrainHeight Terrain Height m int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/Time Time in TAI units s float64 -1.0E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/TimeUTC Coordianted Universal Time NoUnits int16 -30000 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/ViewingAzimuthAngle Viewing Azimuth Angle deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/ViewingZenithAngle Viewing Zenith Angle deg float32 -1.0000000150475E+30 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/XTrackQualityFlags Cross-Track Quality Flags NoUnits int8 -127 N/A N/A
HDFEOS/SWATHS/OMI Slant Column Amount OClO/Geolocation Fields/XTrackQualityFlagsExpanded Expanded Cross-Track Quality Flags NoUnits int16 -30000 N/A N/A
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