Calibration and intercalibration of backscatter ultraviolet (BUV) satellite ozone data

Computer Science

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Scientific paper

Eight TOMS and SBUV ozone instruments have been in orbit since 1978. In addition eight Shuttle SBUV flights have been conducted since 1989. The ESA GOME instrument, using the BUV technique, is flying on ERS-2 since April 1995. At least two more TOMS type instruments will fly on US, Japanese, and Russian environmental satellites. NOAA will continue flying SBUV instruments on their polar platforms until about the year 2004. Combined satellite and ground based data have verified that global ozone depletion has occurred over the past decade. Confidence in the satellite detected trends results from NASA's comprehensive studies of the various instruments pre- and post-launch calibrations and algorithm refinements. Pre-launch calibrations of BUV type instruments is now standardized using an integrating sphere whose radiance is derived from a NIST irradiance standard. Pre-launch calibrations among several BUV instruments is now consistent to 1-2%. Several techniques are used to characterize and correct instrument long term sensitivity once in orbit. These techniques include: on board calibration systems, spectral discrimination, in-orbit intercomparisons, and scene stabilization. These techniques have been applied to the SBUV, TOMS, and SBUV/2 observations resulting in a data record with trend uncertainty of 1% per decade.

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