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Description

The Aura Ozone Monitoring Instrument (OMI) level 2 sulphur dioxide (SO2) total column product (OMSO2) has been updated with a principal component analysis (PCA)-based algorithm (v2) with new SO2 Jacobian lookup tables and a priori profiles that significantly improve retrievals for anthropogenic SO2. The data files (or granules) contain different estimates of the vertical column density (VCD) of SO2 depending on the users investigating anthropogenic or volcanic sources. Files also contain quality flags, geolocation and other ancillary information. The lead scientist for the OMSO2 product is Can Li.

The OMSO2 files are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5). Each file contains data from the daylit half of an orbit (~53 minutes). There are approximately 14 orbits per day. The resolution of the data is 13x24 km2 at nadir, with a swath width of 2600 km and 60 pixels per scan line every 2 seconds.

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
C1239966837-GES_DISC
Data State
ACTIVE
Number of Files/Granules
106552
Processing Level
2
Published
Updated
Science Keywords
Sulfur 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

Krotkov, N. A., & Li, C. (2012). OMI/Aura Sulphur Dioxide (SO2) 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/DATA2022 Date Accessed: 2025-12-13

Documents

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 Total Column Amount SO2/Data Fields/AlgorithmFlag_SnowIce HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/AlgorithmFlag_SnowIce from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/CloudFraction HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/CloudFraction from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/CloudPressure HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/CloudPressure from OMSO2_003 hPa N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/CloudRadianceFraction HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/CloudRadianceFraction from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountO3 HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountO3 from OMSO2_003 DU N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2 HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2 from OMSO2_003 DU N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_PBL HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_PBL from OMSO2_003 DU N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_STL HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_STL from OMSO2_003 DU N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_TRL HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_TRL from OMSO2_003 DU N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_TRM HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_TRM from OMSO2_003 DU N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_TRU HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2_TRU from OMSO2_003 DU N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/Flag_RowAnomaly HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/Flag_RowAnomaly from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/Flag_SAA HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/Flag_SAA from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/GEOS5LayerWeight HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/GEOS5LayerWeight from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/LayerBottomPressure HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/LayerBottomPressure from OMSO2_003 hPa N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/PBLLayerWeight HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/PBLLayerWeight from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/RadiativeCloudFraction HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/RadiativeCloudFraction from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/Reflectivity342 HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/Reflectivity342 from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ScatteringWeight HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/ScatteringWeight from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/SceneReflectivity354 HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/SceneReflectivity354 from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/SlantColumnAmountSO2 HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/SlantColumnAmountSO2 from OMSO2_003 molec/cm2 N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/SurfaceReflectivity HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/SurfaceReflectivity from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/TerrainPressure HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/TerrainPressure from OMSO2_003 hPa N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/UVAerosolIndex HDFEOS/SWATHS/OMI Total Column Amount SO2/Data Fields/UVAerosolIndex from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/GroundPixelArea HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/GroundPixelArea from OMSO2_003 km2 N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/GroundPixelQualityFlags HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/GroundPixelQualityFlags from OMSO2_003 NoUnits N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/Latitude Geodetic Latitude degrees_north float32 -1.2676506002282E+30 N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/Longitude Geodetic Longitude degrees_east float32 -1.2676506002282E+30 N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/RelativeAzimuthAngle HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/RelativeAzimuthAngle from OMSO2_003 deg(EastofNorth) N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SecondsInDay HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SecondsInDay from OMSO2_003 s N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SolarAzimuthAngle HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SolarAzimuthAngle from OMSO2_003 deg(EastofNorth) N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SolarZenithAngle HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SolarZenithAngle from OMSO2_003 deg N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SpacecraftAltitude HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SpacecraftAltitude from OMSO2_003 m N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SpacecraftLatitude HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SpacecraftLatitude from OMSO2_003 degrees_north N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SpacecraftLongitude HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/SpacecraftLongitude from OMSO2_003 degrees_east N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/TerrainHeight HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/TerrainHeight from OMSO2_003 m N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/TiledCornerLatitude HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/TiledCornerLatitude from OMSO2_003 degrees_north N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/TiledCornerLongitude HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/TiledCornerLongitude from OMSO2_003 degrees_east N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/Time Time at Start of Scan (TAI93) seconds since 1993-01-01 float64 -1.2676506002282E+30 N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/ViewingAzimuthAngle HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/ViewingAzimuthAngle from OMSO2_003 deg(EastofNorth) N/A N/A N/A N/A
HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/ViewingZenithAngle HDFEOS/SWATHS/OMI Total Column Amount SO2/Geolocation Fields/ViewingZenithAngle from OMSO2_003 deg N/A N/A N/A N/A
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