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Description
The OMI/Aura Sulphur Dioxide (SO2) Total Column 1-orbit L2 Swath 13x24 km (OMSO2) data product 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.
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
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.
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Krotkov, N. A., & Li, C. (2025). 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/DATA2422 Date Accessed: 2026-05-27
Krotkov, Nickolay A., and Can Li. “OMI/Aura Sulphur Dioxide (SO2) Total Column 1-Orbit L2 Swath 13x24 Km.” NASA Goddard Earth Sciences Data and Information Services Center, 2025. doi:10.5067/AURA/OMI/DATA2422. Date Accessed: 2026-05-27
Krotkov, Nickolay A., and Can Li. OMI/Aura Sulphur Dioxide (SO2) Total Column 1-Orbit L2 Swath 13x24 Km. NASA Goddard Earth Sciences Data and Information Services Center, 2025, doi:10.5067/AURA/OMI/DATA2422. Date Accessed: 2026-05-27
Fioletov, Vitali, McLinden, Chris A., Kharol, Shailesh K., Krotkov, Nickolay A., Li, Can, Joiner, Joanna, Moran, Michael D., Vet, Robert, Visschedijk, Antoon J. H., Denier van der Gon, Hugo A. C.