Modification History

Modification Date: 01 October 2007
Revision 04

• Aura-OMI TO3 total ozone, available starting in 2004, has been included in the MOD total ozone data set.
• NOAA 17 SBUV/2 data, available starting in 2002, has been included in the MOD total and profile ozone data sets. 
  
• NOAA 16 SBUV/2 data includes through June 2007. Data after June not included due to advancing orbit drift.
• EP TOMS data replaced with recent reprocessing to address cross-track bias and calibration issues. This update leads to small changes in the overall calibration.
• Profile Data updated through August 2007.  N16 SBUV/2 data updated and N17 SBUV/2 data added. No Adjustments Between Data Sets.

Modification Date: 21 September 2006
Revision 03

• NOAA 16 SBUV/2 data are included through July 2006.
  
• Error identified and corrected in gridded-mean product. N9_PM data (1985-1989) and later period EP TOMS data (2000-2003) were not properly removed from the gridded average data before the creation of the MOD gridded data sets. This lead to errors typically within 2% for grid average data in these periods. Users of the grid average data should update to Revision 3.
  
• Addition of 10° longitude x 5° latitude spacing of gridded means, along with 30° longitude by 10° latitude spacing.
  
• Small adjustments to data quality filters lead to minor ozone value changes (generally less than |0.5| DU, except less than |2| DU 2001-2003).
  
• No changes to Profile MOD Data Set.

For continuity, the Revision 03 MOD Total Ozone data set, based on Version 8 data,is provided in the following table.

Modification Date: 15 Mar 2006
Revision 02

• NOAA 16 SBUV/2 data are included through December 2005. The data have been reprocessed over the full time period from 2000-2005, as described in the caveat given with the data.
  
• New NOAA 16 SBUV/2 adjustment based on comparison between the updated NOAA 16 and NOAA 11 SBUV/2 data.
  
• No changes to Profile MOD Data Set

For continuity, the Revision 02 MOD Total Ozone data set, based on Version 8 data,
 is provided in the following table.

DATA THROUGH: DEC 2005 LAST MODIFIED: 15 MAR 2006	5° ZONAL MEAN	10° x 30° GRID MEAN* *Note New Resolution
Total Ozone	V8 Zonal Total Ozone	V8 Gridded Total Ozone

Modification Date: 18 Oct 2004
Revision 01

• Do Not Include EP TOMS Data after July 1999
  
• Use N11 SBU/2 Data through FEB 2001
• N16 SBUV/2 Adjustment based on comparison to N11 SBUV/2
• No changes to the MOD Profile Data set at this time

For continuity, the Revision 01 MOD Total Ozone data set, based on Version 8 data,
 is provided in the following table.

DATA THROUGH: DEC 2003 LAST MODIFIED: 18 OCT 2004	5° ZONAL MEAN	10° x 30° GRID MEAN* *Note New Resolution
Total Ozone	V8 Zonal Total Ozone	V8 Gridded Total Ozone

Modification Date: 08 July 2004
Revision 00

• Includes Version 8 TOMS and SBUV data for all instruments
• Includes Version 8 SBUV Profile Data Set
• Include N16 SBUV/2 data through DEC 2003
• Include EP TOMS data through 2001
  
• N16 SBUV/2 adjustment based on direct comparison to EP TOMS
  
• N14 SBUV/2 data are not included because of data quality issues
• N9 SBUV/2 prior to 1993 are not included because of data quality issues
  
• Changed grid resolution to 10° latitude by 30° longitude

For continuity, the Revision 00 MOD data set, based on Version 8 data,
 is provided in the following table.

DATA THROUGH: DEC 2003 LAST MODIFIED: 08 July 2004	5° ZONAL MEAN	10° x 30° GRID MEAN* *Note New Resolution
Total Ozone	V8 Zonal Total Ozone	V8 Gridded Total Ozone
Profile Ozone Layer Amounts (DU)	V8 Zonal Profile Ozone	V8 Gridded Profile Ozone (not yet available)
Profile Ozone Volume Mixing Ratio (PPMV)	V8 Zonal Profile Ozone	V8 Gridded Profile Ozone (not yet available)

Modification Date: 29 April 2003
Final V7-based MOD data set

• Included most recent version of N16 SBUV/2 data
• Included N16 SBUV/2 data through DEC 2002 

Modification Date: 10 May 2002

• Included most recent version of EP TOMS Data
• Included most recent version of N11 SBUV/2 data
• Included most recent version of N14 SBUV/2 data
• Included N16 SBUV/2 data through DEC 2001
• Included N11 SBUV/2 data through FEB 2001
• Removed EP TOMS data after DEC 1999
• Removed N14 SBUV/2 data after JUN 1999
• Removed Data with Equatorial Solar Zenith Angle > 60°

Modification Date: 07 Jan 2001

• EP TOMS Data through DEC 1999 used to determine external calibration offsets
• EP TOMS Data included through DEC 2000
• N14 SBUV/2 Data included through MAY 2000
• N11 SBUV/2 DATA included through APRIL 2000

Responsible NASA official & Website Design Dr. Richard Stolarski and Stacey Frith