NA-9 Solar BackscAtter Ultraviolet (SBUV/2) Instrument and Derived Ozone Data: A Status Report Based on a Review on January 29, 1990
Abstract
The NOAA ozone monitoring program was initiated by the National Environmental Satellite Data and Information Service (NESDIS) in December 1984 with the launch of the NOAA-9 operational satellite carrying the first operational Solar Backscatter Ultraviolet (SBUV/2) spectrometer. The primary conclusions include the following: (1) The NOAA-9 equator crossing time is continually later in the day due to precession of the orbit. This results in an ever-increasing angle of solar incidence on the diffuser plate, approaching values beyond those used in pre-launch radiometric calibration and testing. (2) The increasing equator crossing times also result in observations at greater solar zenith angles at the observed scenes introducing an uncertain zenith-angle dependency on the retrieved ozone values. (3) Compared to other sources of data (SBUV and TOMS on Nimbus 7 and the ground-base Dobson network), the total ozone amount derived from the SBUV/2 shows an increasing greater difference with SBUV/ 2 values being higher. Compared to selected subsets of Dobson values, the SBUV/2 - Dobson differences are diverging about 0.3 - 0.5% per year. (4) Short-term variations in total ozone derived from SBUV/2 measurements show excellent correlation with SBUV and TOMS data with respect to day-to-day, seasonal and latitudinal variabilities.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1990
- Accession Number
- ADA227449
Entities
People
- Walter G. Planet