OMI Ozone measurements: OMTO3 (TOMS Total Ozone column)
- Total ozone columns from OMI measurements derived via the TOMS method are publicly available at the GES-DISC.
- Images and ascii data are available at the TOMS web site.
The NASA OMI algorithm is the TOMS Version 8 algorithm applied to OMI. This version uses only two wavelengths (317.5 and 331.2 nm) to derive total ozone. Four other TOMS wavelengths are used for diagnostics and error correction. V8 was used to reprocess all SBUV and TOMS total ozone data taken since April 1970. Therefore, it is being applied to OMI to ensure continuity of the data record. This algorithm will remain in operation until an algorithm is developed that is demonstrated to be more accurate because it uses the enhanced capabilities of OMI.
The TOMS total ozone algorithm also produces the following other products:
- UV Aerosol index
The solar irradiance reflected up to a spacecraft from the surface of the Earth can be used to calculate reflectivity. Reflectivity calculated for specific bandwidths is needed for the calculation of total column ozone from the TOMS and OMI instruments. Reflected radiation can come from two surfaces, the ground, and the tops of clouds. Reflectivity is determined from the measurements at 380 nm.
Clouds are clearly defined and recognizable in images produced using TOMS and OMI reflectivity data.
- Input for the OMSO2 product derived with the Band Residual Difference algorithm
- Input for the OMUVB product