Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.a52b..05h&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #A52B-05
Physics
0300 Atmospheric Composition And Structure, 0394 Instruments And Techniques
Scientific paper
A series of Solar Backscatter Ultraviolet Mod 2 instruments (SBUV/2) have flown on NOAA polar orbiting satellites for more than 18 years. They have continuously provided valuable long-term data records to monitor the global trends of the total ozone column density and the ozone profile in the upper atmosphere. In order to provide accurate ozone retrievals, many aspects of the SBUV/2 instrument calibration are monitored during flight. An electronic offset value is added to each sample to avoid counter underflow at low signal levels due to noise fluctuations. On-orbit measurement of the offset value for the most sensitive gain range (Range 1) requires extremely dark conditions. Previously, this has been done by examining night-side Earth view data near the time of the new moon, or by closing the aperture door. Both methods allow only periodic updates. Therefore, we have developed a new scheme to determine the daily average of the offset for the ozone retrieval. We examined the earth radiance spectra on the night side. At 252 nm, reflected lunar light and emission from geo-atmospheric activities are much lower than the minimum signal level detectable by the sensor. Therefore, the sensor count level at 252 nm during all night side Earth view measurements can be used to determine the offset value. The derived NOAA-16 SBUV/2 daily offset average well traced the offset measurements with the viewing door closed. The impact of the offset correction in the retrieved upper atmosphere ozone at very high solar zenith angle will be discussed.
DeLand Matthew T.
Huang L. K.
McKay C. A.
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