Abstract:
The second Release of Collection 003 of OMI/Aura Global Gridded Nitrogen Dioxide Product 'OMNO2G' is now available, from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC).
http://disc.sci.gsfc.nasa.gov/Aura/data-holdings/OMI/omno2g_v003.shtml NASA's Aura satellite sensors are tracking important atmospheric
pollutants from space since its launch in
... July, 2004. The Ozone
Monitoring Instrument (OMI), one of the four Aura satellite sensors
with its 2600 km viewing swath width provides daily global
measurements of four important US Environmental Protection Agency's
criteria pollutants (Tropospheric ozone, Nitrogen dioxide, Sulfur
dioxide and Aerosols from biomass burning and industrial emissions,
HCHO, BrO, OClO and surface UV irradiance. OMI is a contribution of
the Netherlands Agency for Aerospace Programs (NIVR)in collaboration
with Finish Meterological Institute (FMI), to the US EOS-Aura
Mission. The principal investigator's (Dr. Pieternel Levelt) institute
is the KNMI (Royal Netherlands Meteorological Institute).
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 algorithm leads for the NO2 products OMNO2 and OMNO2G are NASA OMI
scientist Dr. Nickolay Krotkov and KNMI Scientist Dr. Pepijn Veefkind.
OMNO2G data product is a special Level-2 Gridded Product where pixel
level data are binned into 0.25x0.25 degree global grids. It contains
the data for all L2 scenes that have observation time betweeen UTC
times of 00:00:00 and 23:59:59.9999. All data pixels that fall in a
grid box are saved Without Averaging. Scientist can apply data
filtering scheme of their choice and create new gridded products. The
GES DISC developed interactive tool Giovanni ( http://giovanni.gsfc.nasa.gov/ )
provides on-line web based capabilities to browse and explore these data.
The OMNO2G data product contains almost all parameters that are
contained in OMNO2 product. OMNO2G data are stored in EOS Hierarchical
Data Format (HDF-EOS5). Each file contains data from the day lit
portion of the orbit (~14 orbits). The average file size for the
OMNO2G data product is about 115 Mbytes.
A list of tools for browsing and extracting data from these files can
be found at: http://disc.gsfc.nasa.gov/Aura/tools.shtml
A short Readme Document giving brief algorithm description and a document containing
known data quality related issues for the OMNO2 product, the source of OMNO2G data have
been provided by the OMNO2 Algorithm leads.( http://disc.gsfc.nasa.gov/Aura/OMI/omno2g_v003.shtml )
For more information on Ozone Monitoring Instrument and atmospheric
data products, please visit the OMI-Aura sites:
http://aura.gsfc.nasa.gov/
http://www.knmi.nl/omi/research/documents/ .
Data Category Parameters:
The OMNO2G data file consists of a Grid Data Object which contains
complete information for each pixel binned into a grid.
NO2 Parameters (and STD):
Column Amount NO2, Column Amount NO2 Statosphere,
Column Amount NO2 Troposphere, Slant Column Amount NO2, Atmospheric Mass Factors,---
Ancillary Data: Cloud Fraction (and STD), Cloud Pressure (and
STD), Cloud Radiance Fraction Terrain Pressure, Terrain
Reflectivity
Quality Flags: VCD Quality Flags, Ground Pixel QualityFlags,
Measurement QualityFlags Processing QualityFlags, Fit Quality
Flags, Root Mean Square Error Of Fit
Time and Geolocation Data: Time, Latitude, Longitude Solar
Zenith Angle, Viewing Zenith Angle, Relative Azimuth Angle Line
Number, Scene Number, Number Of Candidate Scenes
For the full set of the Aura products available from the GES DISC,
please see the link below.
http://disc.sci.gsfc.nasa.gov/Aura/
Atmospheric Composition data from Aura and other satellite sensors can be
ordered from the following site:
http://disc.sci.gsfc.nasa.gov/acdisc/ 
