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MEaSUREs
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We use the following instrument data sets to construct the MOD
Profile and Total Column data. Note that the Data Start
Date and Data End Date give the dates in which the
instrument is operational and the full month is available; data
quality considerations may limit the period of data included in
the final MOD product. All data have been retrieved using the
Version 8.6 algorithm (released Spring 2012).
THROUGHOUT THESE PAGES, WE USE "SBUV" TO DENOTE ALL SBUV-TYPE INSTRUMENTS. WHEN REFERRING TO A SPECIFIC INSTRUMENT, THE SATELLITE ABBREVIATION IS ALWAYS INCLUDED, AS DEFINED IN THE TABLE BELOW.
| Instrument | Abbreviation | Data Start Date | Data End Date | Data Comments |
| Nimbus 4 BUV | N4 BUV | May 1970 | April 1976 |
In mid-1972 attitude problems on Nimbus 4 caused
intermittent coverage for the remainder of the record.
All N4 BUV data are used. |
| Nimbus 7 SBUV | N7 SBUV | November, 1978 | May, 1990 |
N7 SBUV data after February 1987 are affected by chopper
wheel synchronization errors. This caused in
increase in measurement noise, but monthly zonal mean values
are minimally effected.
All N7 SBUV data are used. |
| NOAA 9 SBUV/2 | N9 SBUV/2 | February, 1985 | January, 1998 | N9 SBUV/2 data are of poorer quality, and are only used to
complete gaps in the Total Ozone MOD as needed. Power problems
after June 1997 seriously degrade the N9 longitudinal
coverage. No N9 SBUV/2 data are used. |
| NOAA 11 SBUV/2 | N11 SBUV/2 | January, 1989 | March, 2001 |
N11 SBUV/2 suffered problems with the instrument grating
drive beginning in late 1993. These errors increased in the
late 1990s, but soft-calibration techniques are used to correct the data.
The N11 satellite was in a near-terminator orbit from
January 1995 - July 1997. No N11 SBUV/2 data used Jan 1995 - Jul 1997. |
| NOAA 14 SBUV/2 | N14 SBUV/2 | March, 1995 | September, 2006 |
N14 SBUV/2 developed grating drive errors several months
after launch, and the errors became progressively worse with
time. In addition, the cloud cover radiometer failed
directly after launch. The grating drive control was
reprogrammed in June 1998 to compensate for grating drive
issues as well as for the CCR failure. The N14 satellite was
in a near-terminator orbit from June 2001 - June 2003. N14
data are markedly noisier after the terminator period. No N14 SBUV/2 data used after June 2001. |
| NOAA 16 SBUV/2 | N16 SBUV/2 | October, 2000 | Operational | N16 SBUV/2 periodically experiences electronic
interference in measurements that are used in the derivation
of total ozone. However, total ozone calculated as the sum
of the profile total, as is done in Version 8, is not
sensitive to this error. The N16 satellite began drifting in
early 2004, and continues to drift towards the terminator at
an increasing rate. No N16 SBUV/2 data used after June 2007. |
| NOAA 17 SBUV/2 | N17 SBUV/2 | August, 2002 |
Operational | The N17 satellite began drifting in late 2007, and
continues to drift towards the terminator at an increasing
rate. No N17 SBUV/2 data used after Dec 2010. |
| NOAA 18 SBUV/2 | N18 SBUV/2 | July, 2005 |
Operational | All N18 SBUV/2 data used. |
| NOAA 19 SBUV/2 | N19 SBUV/2 | March, 2009 |
Operational | NOAA-19 data not yet incorporated into MOD data sets. |
| Suomi NPP OMPS |
OMPS |
December, 2011 |
Operational |
OMPS is the next generation
nadir-viewing BUV instrument that will continue the MOD time
series. |
SBUV Satellite Data Coverage shows the time period during which each instrument was collecting reliable profile ozone measurements (blue line segments in figure). When data from all the instruments are included, the coverage is nearly continuous from late 1978 to the present.
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Responsible NASA
official & Website Design Dr. Richard McPeters and Stacey Hollandsworth Frith Last Modified June 15, 2012 |
