Daily Global Sulphur Dioxide Column Measurements from OMI/Aura Satellite

OMI/Aura Sulphur Dioxide (SO2) Total Column Daily L2 Global Gridded 0.125 degree x 0.125 degree V004 is a Level-2G daily global gridded product from NASA's GES DISC. It bins pixel-level OMI SO2 observations into 0.125x0.125 degree global grids for all scenes within a UTC day, containing parameters like SO2 vertical column values, UV aerosol index, and cloud data. Data is stored in HDF-EOS5 format, with daily files compiled from approximately 15 satellite orbits.

Use Cases

• Tracking volcanic SO2 plume dispersion and quantifying emissions using the SO2 vertical column data and geolocation fields.
• Analyzing correlations between anthropogenic pollution sources and ancillary parameters like UV aerosol index and cloud fraction.
• Developing time-series models of regional SO2 levels by aggregating daily gridded data over specific geographic areas.
• Applying custom data filtering schemes to the raw gridded values and quality flags to create derived products for specific research questions.

Strengths

• High spatial resolution of 0.125x0.125 degrees for global coverage.
• Contains multiple SO2 vertical column values corresponding to different a-priori retrieval profiles.
• Includes ancillary geophysical parameters like cloud pressure and viewing angles for contextual analysis.

Limitations

• Pixel data within each grid cell is saved without averaging, which may require significant user-side processing for analysis.
• The specific temporal range and update recency for the dataset are not provided in the description.
• File sizes up to approximately 146 MB per daily file may require substantial storage and bandwidth.

Provenance

Source

NASA Goddard Earth Sciences Data and Information Services Center (GES DISC).

Collection Method

Satellite observations from the Ozone Monitoring Instrument (OMI) on the Aura spacecraft, processed into a Level-2 gridded (L2G) product.

Time Range

Daily data files, covering scenes from 00:00:00 to 23:59:59.9999 UTC each day.

Freshness

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Geography

Global gridded coverage.