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  • Author or Editor: D. F. Heath x
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R. P. Cebula, H. Park, and D. F. Heath


Precise knowledge of in-orbit sensitivity change is critical for the successful monitoring of stratosphere ozone by satellite-based remote sensors. This paper evaluates those aspects of the in-flight operation that influence the long-term stability of the upper stratosphere ozone measurements made by the Nimbus-7 SBUV spectroradiometer and chronicles methods used to maintain the long-term albedo calibration of this UV sensor. It is shown that the instrument's calibration for the ozone measurement, the albedo calibration, has been maintained over the first 6 yr of operation to an accuracy of approximately ±2%. The instrument's wavelength calibration is shown to drift linearly with time. Knowledge of the SBUV wavelength assignment is maintained to a 0.02 mm precision.

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S. E. Frederick, R. P. Cebula, and D. F. Heath


The scientific objective of unambiguously detecting subtle global trends in upper stratospheric ozone requires that one maintain a thorough understanding of the satellite-based remote sensors intended for this task. The instrument now in use for long term ozone monitoring is the SBUV/2 being flown on NOAA operational satellite. A critical activity in the data interpretation involves separating small changes in measurement sensitivity from true atmospheric variability. This is the goal of the instrument characterization task, and of necessity it involves examining numerous details of SBUV/2 hardware operation. By defining the specific issues that must be addressed and presenting results derived early in the mission of the first SBUV/2 flight model, this work serves as a guide to the instrument investigations that an essential in the attempt to detect long-tem changes in the ozone layer.

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