National Aeronautics and Space Administration

Goddard Space Flight Center

SBUV Merged Ozone Data Set (MOD)

1970-2021 Profile and Total Column Ozone from the SBUV Instrument Series

MOD Product Modification History

This page outlines past versions of the Merged Ozone Data Set. Three sections are included: the current generation of MOD data sets based on Version 8.7 (Version 2.8/2.9) SBUV (OMPS NP) data, and older versions based on (1) Version 8.6 SBUV data and (2) Version 8 SBUV and Total Ozone Mapping Spectrometer (TOMS) measurements.

MOD Profile and Total Ozone Based on Version 8.7 SBUV and Version 2.8/2.9 OMPS NP

Last Modification: 19 August 2024

v2 Release 2:

• Update to OMPS NP V2.9, extend through December 2023.
• Include Filter for OMPS data impacted by Hunga Tonga Volcano
• Extend Daily Overpass Product using MOD v2 Release 2 data selection.

Last Modification: 21 May 2022

v2 Release 1 Extended:

• MOD v2 Release 1 Replace all instrument records with v8.7 retrievals (v2.8 for OMPS NP)
• No longer include N14am SBUV/2 in MOD record based on updated radiance intercomparisons
• No longer include N16am SBUV/2 in MOD record based on updated radiance intercomparisons
• Extend OMPS NP V2.8 (equivalent to SBUV V8.7) through December 2021.
• Extend Daily Overpass Product using MOD v2 Release 1 data selection.

Last Modification: 20 August 2021 NEW VERSION

v2 Release 1:

• MOD v2 Release 1 Replace all instrument records with v8.7 retrievals (v2.8 for OMPS NP)
• No longer include N14am SBUV/2 in MOD record based on updated radiance intercomparisons
• No longer include N16am SBUV/2 in MOD record based on updated radiance intercomparisons
• Extend OMPS NP V2.8 (equivalent to SBUV V8.7) through December 2020.
• Extend Daily Overpass Product using MOD v2 Release 1 data selection.

MOD Profile and Total Ozone Based on Version 8.6 SBUV

Last Modification: 20 November 2019

Release 7:

• Extend N19 through March 2018 using updated calibration (March 2019). N19 after March 2018 is approaching the terminator.
• Update N19 data over entire record using latest calibration; largest changes are from late 2014 onwards.
• Include OMPS NP V2.6 from April 2012-December 2018.
• Extend Daily Overpass Product using MOD Release 7 data selection.

Last Modification: 1 June 2018

Release 6 Extended:

• Extend N19 through December 2017 using extrapolated calibration (April 2016).
• Update N19 data from April 2016-Dec 2017 to correct periodic error in stray light correction (small effects in MZM above 5 hPa)
• Extend Daily Overpass Product using MOD Release 6 data selection.

Last Modification: 16 May 2017

Release 6 Extended:

• Extend N19 through February 2017 using most recent revised calibration (April 2016).
• Extend Daily Overpass Product using MOD Release 6 data selection.

Last Modification: 17 May 2016

Release 6:

• Update full N19 record using most recent revised calibration (April 2016).
• Extend N19 through February 2016.
• Update Daily Overpass Product using MOD Release 6 data selection.

Last Modification: 02 November 2015

Release 5:

• Update full N19 record using most recent revised calibration (Jan 2015).
• Extend N19 through July, 2015 (Feb-Jul 2015 extrapolated calibration).
• Minor updates to filtering scheme for all instruments.
• Update Daily Overpass Product using MOD Release 5 data selection.

Last Modification: 12 November 2014

Release 4:

• Extend N19 through June, 2014.
• Extend N16 through end of instrument record, May, 2014.
• Update full N16 and N19 records using most recent revised calibration. Note the updated calibration changed N16 values in particular over the length of the record.
• Update Daily Overpass Product using MOD Release 4 data selection.

Last Modification: 04 September 2013

Release 3:

• Extend N16/N19 through July, 2013.
• Update full N16 record using most recent revised calibration.
• Update Daily Overpass Product using MOD Release 3 data selection.

Last Modification: 10 May 2013

Release 2:

• Update full N17/N18 records using most recent revised calibrations.
• Extend N16/N18 through 2012.
• Inlcude N19 record from launch in 2009 through 2012.

Last Modification: 25 Aug 2012

Release 1:

• Use only measurements made when instrument orbit is within 8am - 4pm Equator Crossing Time (ECT) range.
• Do not include N9 Data.
• Extend N11 to ECT of 5:50 pm to maintain coverage through 1994 - 1995.
• Profile Only: Filter data after eruptions of El Chichon and Mt. Pinatubo volcanos.
• Total Only: Include N9 Total Ozone solely to fill gaps in N11 coverage. Profile Ozone in these cases set to 0 (missing value).
• Construct Daily Overpass Product using MOD Release 1 data selection rules.

MOD Total Ozone Based on Version 8 SBUV and TOMS

For continuity we include the final version of each Total Ozone MOD Data Set (sorted by "Revision" Number), and list the intermediate modifications for each revision.

Modification Date: 25 Jan 2012

Revision 5 Total Ozone Data Set Extended:

• Includes extended NOAA 18 data using latest calibrations.
• N17 data not used after 2010 because of orbit drift towards the terminator.
• OMI data not used after 2010 because of reduced coverage due to partial physical obstruction of optics (row anomaly).

Modification Date: 13 Jun 2011

Revision 5 Total Ozone Data Set Extended:

• Includes extended NOAA 17 and NOAA 18 data using latest calibrations.
• Includes extended OMI data.

Modification Date: 1 May 2009

Revision 5 Total Ozone Data Set:

• Includes reprocessed N16 and N17 SBUV/2 data using latest calibration.
• OMI data updated from Collection 2 to Collection 3.
• New offsets derived based on revised data sets.
• 1970-1972 N4 BUV data added with no adjustments.

Modification Date:20 Oct 2008

Revision 4 Total Ozone Data Set Extended:

• The current Revision 4 record has been extended using the latest Aura OMI and N17 SBUV/2 total ozone data.
• Data through August, 2007 have not changed from the previous version for consistency. However, these data will change to incorporate the latest instrument calibrations when we introduce the Revision 5 data set in early 2009.
• The data from Sep 2007 through Sep 2008 do include the latest calibrations for OMI and N17 data, but the changes are minor and do not affect the overall consistency of the record.

Modification Date:01 Oct 2007

Revision 4 Total Ozone Data Set:

• 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.

Modification Date:21 Sep 2006

Revision 3 Total Ozone Data Set:

• 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).

Modification Date:15 Mar 2006

Revision 2 Total Ozone Data Set:

• 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.

Modification Date:18 Oct 2004

Revision 1 Total Ozone Data Set:

• 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

Modification Date:08 Jul 2004

Revision 0 Total Ozone Data Set:

• 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.

MOD Profile Ozone Based on Version 8 SBUV

For continuity we include the final version of each Profile Ozone MOD Data Set and list the intermediate modifications for each revision. Merging of the Version 8 profile data was complicated by larger offsets between instruments, such that the profile data set was not publically released or maintained as often as the Version 8 MOD Total Ozone. Revision 1 Profile Ozone was only available between 64 hPa and 1 hPa.

Modification Date:01 May 2009

Revision 1 Profile Ozone Data Set:

• Revision 1 includes mean offsets computed and applied for each level individually between 64 hPa and 1 hPa. The offsets are based on SBUV instrument intercomparisons and comparisons with UARS MLS and SAGE II independent data.
• Includes reprocessed N16 and N17 SBUV/2 data using latest calibration.

Modification Date:01 May 2009

Revision 0 Profile Ozone Data Set Extended:

• Includes reprocessed N16 and N17 SBUV/2 data using latest calibration.
• Includes filtering for Mt. Pinatubo in the lower to middle stratosphere.

Modification Date:01 Oct 2007

Revision 0 Profile Ozone Data Set Extended:

• Profile Data updated through August 2007.
• N16 SBUV/2 data updated and N17 SBUV/2 data added.

Modification Date:08 Jul 2004

Revision 0 Profile Ozone Data Set:

• Revision 0 is a simple average of the data from individual instruments. No offsets are applied to individual data sets.
• Includes N16 SBUV/2 data through 2003.

MOD Total Ozone Based on Version 7 SBUV and TOMS

For continuity we include the final version of the Total Ozone MOD Data Set based on Version 7 TOMS and the special 'Version 7 processing of the SBUV total ozone wavelengths to give a TOMS-equivalent SBUV total ozone.

Modification Date:29 Apr 2003

V7-based MOD Data Set Final:

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

Modification Date:10 May 2002

V7-based MOD Data Set Extended:

• 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

V7-based MOD Data Set:

• 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