TOMS/Earth-Probe Ozone (O3) Total Column 1-Orbit L2 Swath 50x50 km V008 (TOMSEPL2) at GES DISC
Entry ID:
GES_DISC_TOMSEPL2_V008
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Summary
Abstract:
Total Ozone Mapping Spectrometer (TOMS)instruments have been successfully flown in orbit aboard the Nimbus-7(Nov. 1978 - May 1993), Meteor-3 (Aug. 1991 - Dec. 1994), Earth Probe (July 1996 - current), and ADEOS (Sep. 1996 - June 1997) satellites. Since last thirty years, TOMS data have been providing useful information related to the ozone depletion, recovery and global trend. The Earth Probe, ... Meteor-3 and Nimbus-7 Total Ozone Mapping Spectrometer (TOMS) data are currently reprocessed using version-8 algorithm ( http://ozoneaq.gsfc.nasa.gov/documents.md ).
The TOMS version 8 daily Level-2 swath data product consists of total column ozone, aerosol index, and Lambertian effective surface reflectivity (Rayleigh corrected) at approximately 50x50 km resolution (at nadir). This product also contains some auxiliary derived and ancillary parameters including N-values, SO2 index, cloud fraction, cloud pressure, ozone below clouds, terrain height, geolocation, solar and satellite viewing angles, and data quality flags.
These Level-2 data are stored in the EOS version of Hierarchical Data Format 5 (HDF-EOS5) and are available ( http://mirador.gsfc.nasa.gov/) from the Goddard Earth Sciences (GES) Distributed Active Archive Center (DAAC).
TOMS Levle-3 (Global Gridded 1x1.25 deg) are also available from the GES DISC. The GES DISC DAAC maintains an online Web-based browser for previewing the data, subsetting in ASCII format and downloading the data and images. The URL for the TOMS browser is http://giovanni.gsfc.nasa.gov/
For more information regarding TOMS or other DAAC data sets please
visit the DAAC Home Page at http://disc.sci.gsfc.nasa.gov/acdisc/ , or
contact the DAAC Help Desk at:
GSFC DAAC Help Desk
NASA Goddard Space Flight Center
Code 610.2
Greenbelt, MD 20771
gsfc-help-disc@lists.nasa.gov
TOMS data are produced by the Laboratory for Atmospheres at NASA Goddard Space Flight Center (Code 613.1). The Version-8 Algorithm Theoretial Basis Document (ATBD)is available from the TOMS site http://ozoneaq.gsfc.nasa.gov/documents.md
The Level-3 data from Nimbus-7 TOMS, Meteor-3 TOMS, and Earth Probe TOMS are also made available from the TOMS site in the ASCII format. For detailed information about the TOMS instrument, data, and ozone see the TOMS official Home Page at: http://ozoneaq.gsfc.nasa.gov/ 
Related URL
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Description:
Get TOMS data from the GES DISC Mirador
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 90.0
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S: -90.0
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E: 180.0
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W: -180.0
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Data Set Citation
Dataset Originator/Creator:
TOMS Science Team
Dataset Title:
TOMS/Earth-Probe Ozone (O3) Total Column 1-Orbit L2 Swath 50x50 km
Dataset Series Name:
TOMS Data
Dataset Release Place:
Greenbelt, MD
Dataset Publisher:
NASA Goddard Space Flight Center
Version:
008
Online Resource:
http://mirador.gsfc.nasa.gov/
Temporal Coverage
Start Date:
1996-07-25
Stop Date:
2005-12-31
Data Resolution
Latitude Resolution:
50 km
Longitude Resolution:
50 km
Temporal Resolution:
Approx 1 hour (day time orbit)
Quality
WARNING: EP TOMS started experiencing calibration problem since 2002. For data beginning in year 2000, the calibration has been stabilized relative to NOAA-16 SBUV/2 in the equatorial zone. Because of continuing changes in the optical properties of the front scan mirror that are not well understood, data are showing a latitude dependent error that cannot be corrected by a simple calibration correction. The calibration appears to be stable near the equator. But by 50 degrees latitude, there is now a -2% to -4% error in TOMS, a bit larger in the northern hemisphere than in the southern hemisphere. Because of this error, data since 2002 should NOT be used for trend analysis
Use Constraints
EP TOMS started experiencing calibration problem since 2002. Because of the continuing changes in the optical properties of the front scan mirror that are not well understood, data started showing a latitude dependent error that cannot be corrected by a simple calibration correction. The calibration appears to be stable near the equator. But by 50 degrees latitude, there is now a -2% to -4% error in TOMS, a bit larger in the northern hemisphere than in the southern hemisphere.
Earth Probe TOMS data since 2002 should NOT be used for trend analysis because of the calibration problem.
Data Set Progress
COMPLETE
Personnel
Role:
TECHNICAL CONTACT
Phone:
415-329-4949
Fax:
415-329-4936
Email:
harden at usgs.gov
Contact Address:
US Geological Survey, Mail Stop 975
345 Middlefield Road
City:
Menlo Park
Province or State:
CA
Postal Code:
94025
Country:
USA
Role:
DIF AUTHOR
Phone:
(865) 574-7447
Email:
uso at daac.ornl.gov
Contact Address:
ORNL DAAC User Services Office
Oak Ridge National Laboratory
City:
Oak Ridge
Province or State:
TN
Postal Code:
37831-6407
Country:
USA
Creation and Review Dates
DIF Creation Date:
1999-01-30
Last DIF Revision Date:
2011-10-20
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