Summary

Description

The OMI/Aura Level-3 Global Gridded(0.25x0.25 deg) Nitrogen Dioxide Product "OMNO2d" is now released (Jan 10, 2013) to the public from the NASA Goddard Earth Sciences Data and Information Services Center(GES DISC). The OMNO2 (Level-2) and OMNO2G (Level-2G, binned) processed earlier (in 2012) are also available from GES DISC. see http://disc.sci.gsfc.nasa.gov/Aura/data-holdings/OMI/ Nitrogen dioxide is an important chemical species in both, the stratosphere where it plays a key role in ozone chemistry, and in the troposphere where it is a precursor to ozone production. In the troposphere, it is produced in various combustion processes and in lightning and is an indicator of poor air quality. (The shortname for this Level-3 Global Gridded Nitrogen Dioxide Product is OMNO2d_V003) The algorithm leads for the NO2 products are NASA OMI scientist Dr. Nickolay Krotkov and KNMI scientist Dr. Pepijn Veefkind. OMNO2d data product is a Level-3 Gridded Product where pixel level data of good quality are binned and "averaged" into 0.25x0.25 degree global grids. This product contains Total column NO2 and Total Tropospheric Column NO2, for all atmospheric conditions, and for sky conditions where cloud fraction is less than 30 percent. Details are available in the documents provided on the NASA GES DISC OMI site http://disc.gsfc.nasa.gov/Aura/OMI/documents/v003/omno2d_v003.shtml OMNO2d data are stored in EOS Hierarchical Data Format (HDF-EOS). Each file contains data from the day lit portion of the orbit (~14 orbits). The average file size for the OMNO2d data product is about 6 Mbytes.