XDS: OMI

The OMI instrument distinguishes between aerosol types, such as smoke, dust, and sulfates, and can measure cloud pressure and coverage, which provide data to derive tropospheric ozone. OMI continues the TOMS record for total ozone and other atmospheric parameters related to ozone chemistry and climate. The OMI instrument is mounted on the EOS Aura platform. The OMI instrument employs hyperspectral imaging in a push-broom mode to observe solar backscatter radiation in the visible and ultraviolet. The hyperspectral capabilities improve the accuracy and precision of the total ozone amounts and also allow for accurate radiometric and wavelength self-calibration over the long term. The instrument is a contribution of the Netherlands’s Agency for Aerospace Programs (NIVR) in collaboration with the Finnish Meteorological Institute (FMI) to the EOS Aura mission.

Daily gridded values of ozone, radiative cloud fraction, and aerosol index.

Data begin in October 2004.

Global Earth Coverage (GEC) is provided. The grid is cartesian 1 deg by 1 deg latitude/longitude grid.

gecomiaerosolindexX1.00
gecomiozoneX1.00
gecomiradcfX1.00

Information about OMI on the Auru GSFC website
The OMI data on the TOMS website

Vasile Tudor Garbulet

ARM Data Center

Institution
GSFC Aura Website

Reprocessing Date
The OMI (Ozone Monitoring Instrument) datastream “gecomiX1.a1” has recently been changed and reprocessed from October, 2004 to present. The reprocessed data, known as “Collection 3” data, have been reprocessed with revised calibration. Also, the grid has changed from a 1×1.25 degree latitude/longitude grid to a 1×1 degree grid and the reflectivity data have been replaced with radiative cloud fraction.

XDC reprocessed all the omi data back to 200410 and sent them to the Data Center on April 10, 2008.

Start End Processing
Reason Reprocessing

• Note that this datastream replaces the TOMS datastream gectomsX12.a1
• Each file spans 1 month of daily global grids
• OMT03 README File

GEC     Global Earth Coverage
GSFC    Goddard Space Flight Center
OMI     Ozone Monitoring Instrument