OMI/Aura Ozone(O3) Total Column 1-Orbit L2 Swath 13x24 km V003 (OMTO3) at GES DISC
Entry ID: GES_DISC_OMTO3_V003

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Summary
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.

The Ozone Monitoring Instrument (OMI)was launched aboard the EOS-Aura satellite on July 15, 2004(1:38 pm equator crossing time, ascending mode). OMI with its 2600 km viewing swath width provides almost daily global coverage. 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). OMI is designed to monitor stratospheric and tropospheric ozone, clouds, aerosols and smoke from biomass burning, SO2 from volcanic eruptions, and key tropospheric pollutants (HCHO, NO2) and ozone depleting gases (OClO and BrO).

OMI sensor counts, calibrated and geolocated radiances, and all derived geophysical atmospheric products will be archived at the NASA Goddard DAAC.

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 and 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.

A list of tools for browsing and extracting data from these files can
be found at: http://disc.gsfc.nasa.gov/Aura/tools.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 OMTO3 data file contains one swath which consists of two groups:

Data fields:
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

Geolocation Fields:
Latitude, Longitude, Time, Relative Azimuth, Solar Zenith and Azimuth,
Viewing Zenith and Azimuth angles, Spacecraft Altitude, Latitude,
Longitude, Terrain Height, Ground Pixel Quality Flags.

For the full set of Aura data 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 sites:
http://disc.sci.gsfc.nasa.gov/acdisc/
http://mirador.gsfc.nasa.gov/

Related URL
Link: GET DATA > MIRADOR
Description: Access OMI Level 2 Ozone (O3) Total Column [OMTO3] data from MIRADOR.


Link: GET DATA > LANCE
Description: Near real-time (NRT) data are available from OMI for certain L2 and L3 products. Whereas the standard OMI forward processing acquires 2-hour L0 files from the GES DISC within 6-7 hours of real time, LANCE-OMI acquires session-based L0 files from EDOS and the end of the session is available within 10-30 minutes after real time.


Link: GET SERVICE > GET SOFTWARE PACKAGE
Link: GET SERVICE > GET SOFTWARE PACKAGE


Link: VIEW PROJECT HOME PAGE
Link: VIEW PROJECT HOME PAGE
Description: OMI Home Page and OMTO3 Algorithm Page.


Link: VIEW RELATED INFORMATION
Description: OMTO3 Data Set Home Page


Link: VIEW RELATED INFORMATION > USER'S GUIDE
Description: User's Guide for OMI Data Products


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

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
Version: 003
Data Presentation Form: Digital Science Data
Other Citation Details: http://ozoneaq.gsfc.nasa.gov/
Online Resource: http://disc.gsfc.nasa.gov/Aura/OMI/omto3_v003.shtml


Temporal Coverage
Start Date: 2004-10-01


Location Keywords
GEOGRAPHIC REGION > GLOBAL


Data Resolution
Latitude Resolution: 13 km
Longitude Resolution: 24 km
Vertical Resolution: Approx 80 km (atmospheric column)
Temporal Resolution: Approx 1 hour (day time orbit)


Science Keywords
ATMOSPHERE >AEROSOLS >DUST/ASH/SMOKE >UV ABSORBING AEROSOL INDEX    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD FREQUENCY >RADIATIVE CLOUD FRACTION    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD TOP PRESSURE >RADIATIVE CLOUD PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >ULTRAVIOLET RADIATION >REFLECTANCE    [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >OXYGEN COMPOUNDS >OZONE >COLUMN AMOUNT OZONE    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
AURA >Aura    [Information]


Instrument
OMI >Ozone Monitoring Instrument    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
AURA >Earth Observing System (EOS), AURA    [Information]
CWIC >CEOS WGISS Integrated Catalog    [Information]


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


Keywords
Atmospheric Chemistry
Total Column Ozone
Ozone Layer
Air Quality
Ozone Depletion
Ozone Hole
Aerosol Index
UV based Effective Surface Reflectivity
EOSDIS
LANCE
NRT
Near Real Time (NRT)


Data Set Progress
IN WORK


Originating Center
OMI Science Team


Data Center
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://disc.gsfc.nasa.gov/
Dataset ID: OMTO3

Data Center Personnel
Name: GES DISC HELP DESK SUPPORT GROUP
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Atmospheric Composition Data Center, Goddard Earth Sciences Data and Information Services Center, Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://disc.sci.gsfc.nasa.gov/acdisc/

Data Center Personnel
Name: ACDISC USER SUPPORT OFFICE
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Size: Approx 35 MB per file
Distribution_Format: HDF-EOS5
Fees: None


Personnel
PAWAN K BHARTIA, PH. D
Role: INVESTIGATOR
Phone: 301-614-5731
Fax: 301-614-5903
Email: Pawan.K.Bhartia at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 613.3
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


SURAIYA P. AHMAD, PH. D
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: 301-614-5284
Email: Suraiya.Ahmad at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 610.2
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Publications/References
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.
http://disc.sci.gsfc.nasa.gov/acdisc/ozone/docs/omi-spie-2003.doc

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.
http://eospso.gsfc.nasa.gov/sites/default/files/atbd/ATBD-OMI-02.pdf

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.

http://eospso.gsfc.nasa.gov/sites/default/files/atbd/ATBD-OMI-01.pdf

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
2004.
http://aura.gsfc.nasa.gov/project/eos-agu-aura-article.pdf

Creation and Review Dates
DIF Creation Date: 2005-04-28
Last DIF Revision Date: 2013-09-18

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