OMI/Aura Ozone(O3) Total Column 1-Orbit L2 Swath 13x24 km V003 (OMTO3) at GES DISCEntry ID: GES_DISC_OMTO3_V003
Abstract: The OMI/Aura Level-2 Total Column Ozone Data Product OMTO3 (Version 003) is made available (http://disc.gsfc.nasa.gov/Aura/OMI/omto3_v003.shtml) from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) for the public access.
OMI provides two Level-2 (OMTO3 and OMDOAO3) total column ozone products at pixel resolution (13 x 24 km at nadir) that ... are based on two different algorithms. This level-2 global total column ozone product (OMTO3)is based on the enhanced TOMS version-8 algorithm that essentially uses the ultraviolet radiance data at 317.5 and 331.2 nm. OMI additional hyper-spectral measurements help in the corrections for the factors that induce uncertainty in ozone retrieval (e.g., cloud and aerosol, sea-glint effects, profile shape sensitivity, SO2 and other trace gas contamination). In addition to the total ozone values this product also contains some auxiliary derived and ancillary input parameters including N-values, effective Lambertian scene-reflectivity, UV aerosol index, SO2 index, cloud fraction, cloud pressure, ozone below clouds, terrain height, geolocation, solar and satellite viewing angles, and extensive quality flags.
(The shortname for this Level-2 OMI total column ozone product is OMTO3)
The algorithm lead for this product is NASA OMI scientist Dr. Pawan K. Bhartia ( Pawan.K.Bhartia@nasa.gov).
OMTO3 files are stored in EOS Hierarchical Data Format (HDF-EOS5). Each file contains data from the day lit portion of an orbit (~53 minutes). There are approximately 14 orbits per day. The maximum file size for the OMTO3 data product is about 35 Mbytes.
Data Category Parameters:
The OMTO3 data file contains one swath which consists of two groups:
OMI Total Ozone,Effective Reflectivity (331 - 360 nm), N-value,
Cloud Fraction, Cloud Top Pressure, O3 below Cloud, UV Aerosol Index,
SO2 index, Wavelength used in the algorithm, many Auxiliary Algorithm
Parameter and Quality Flags
Latitude, Longitude, Time, Relative Azimuth, Solar Zenith and Azimuth,
Viewing Zenith and Azimuth angles, Spacecraft Altitude, Latitude,
Longitude, Terrain Height, Ground Pixel Quality Flags.
Data Set Citation
Dataset Originator/Creator: OMI Science Team
Dataset Title: OMI/Aura Ozone (O3) Total Column 1-Orbit L2 Swath 13x24 km
Dataset Series Name: OMTO3
Dataset Release Date: April 2012
Dataset Release Place: NASA Goddard Space Flight Center
Data Presentation Form: Digital Science Data
Other Citation Details: http://ozoneaq.gsfc.nasa.gov/Online Resource: http://disc.sci.gsfc.nasa.gov/datacollection/OMTO3_V003.html
Start Date: 2004-10-01
Latitude Resolution: 13 km
Longitude Resolution: 24 km
Horizontal Resolution Range: 10 km - < 50 km or approximately .09 degree - < .5 degree
Vertical Resolution: Approx 80 km (atmospheric column)
Temporal Resolution: Daily
Temporal Resolution Range: Hourly - < Daily
ISO Topic Category
Quality The 'version 003' product is the second public release. The quality of this v003 product is based on improved calibration algorithm however this product is not fully validated yet. Please see below the detailed Quality assessment. Overall the quality of total ozone and AI data produced by OMTO3 is similar to that from TOMS. Based on experience with TOMS, the total ozone data provided in OMTO3 ... should have a root-mean squared error of 1-2%, depending on solar zenith angle, aerosol amount, and cloud cover. These errors are best described as pseudo-random: systematic over small areas with a unique geophysical regime, random over large areas contain mixture of geophysical regimes. Preliminary analyses show that OMTO3 data compare well with Dobson and Brewer stations. However for the most recent information on the OMTO3 data quality the data users are advised to see the data quality document available from the OMTO3 data product site(http://disc.gsfc.nasa.gov/Aura/OMI/omto3_v003.shtml).
Use Constraints This Data set (version 003/second public release) is not fully validated yet. Before using it for any research please read the data quality document provided by the OMTO3 algorithm team and available from http://disc.gsfc.nasa.gov/Aura/OMI/omto3_v003.shtml
Data Set Progress
Distribution Media: FTP
Distribution Size: Approx 35 MB per file
Distribution Format: HDF-EOS5
Email: Pawan.K.Bhartia at nasa.gov
NASA Goddard Space Flight Center Mailstop 613.3
Province or State: MD
Postal Code: 20771
Role: DIF AUTHOR
Email: jennifer.c.wei at nasa.gov
Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center
Province or State: MD
Postal Code: 20771
Ahmad, S. P., P. F. Levelt, P. K. Bhartia, E. Hilsenrath,
G. W. Leppelmeier, and J. E. Johnson, Atmospheric Products from
the Ozone Monitoring Instrument (OMI), Proceedings of SPIE
conference on Earth Observing Systems VIII, San Diego,
... California, Aug 3-8, 2003.
Bhartia, P. K. and C. W. Wellemeyer, OMI TOMS-V8 Total O3
Algorithm, Algorithm, Algorithm Theoretical Baseline Document:
OMI Ozone Products, P. K. Bhartia (ed.), vol. II, ATBD-OMI-02,
version 2.0, Aug. 2002.
Brinksma, E. J., K. F. Boersma, and P. F. Levelt, OMI-Validation
Requirements, May 16, 2003.
Froidevaux, L. and A. Douglass, Earth Observing System (EOS)
Aura Science Data Validation Plan, July 2001
Levelt, P.F., J. P. Veefkind, R. H. M. Voors, and J. de Vries,
Instrument Description, Algorithm Theoretical Baseline
Document: OMI Instrument, Level 0 - 1B processor, Calibration
Operations, P. F. Levelt (ed.), vol. I, ATBD-OMI-01,
version 2, Aug. 2002.
Levelt, P. F., B. van den Oord, E. Hilsenrath,
G. W. Leppelmeier, P. K. Bhartia, A. Malkki, H. Kelder,
R. J. van der A, E. J. Brinksma, R. van Oss, P. Veefkind,
M. van Weele, and R. Noordhoek, Science Objectives of
EOS-Aura's Ozone Monitoring Instrument (OMI), Proc. Quad. Ozone
Symposium, Sapporo, Japan, pp. 127-128, 2000.
Schoeberl, M.R., A.R. Douglass, E. Hilsenrath, P.K. Bhartia,
J. Barnett, J. Gille, R. Beer, M. Gunson, J. Waters,
P.F. Levelt, P. DeCola, The EOS Aura Mission, EOS,
Transactions, American Geophysical Union 85 , Number 18, 4 May
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2005-04-28
Last DIF Revision Date: 2015-06-26
Future DIF Review Date: 2015-01-30