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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 15 — May. 20, 2006
  • pp: 3652–3658

Method of calibration to correct for cloud-induced wavelength shifts in the Aura satellite's Ozone Monitoring Instrument

Robert Voors, Marcel Dobber, Ruud Dirksen, and Pieternel Levelt  »View Author Affiliations


Applied Optics, Vol. 45, Issue 15, pp. 3652-3658 (2006)
http://dx.doi.org/10.1364/AO.45.003652


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Abstract

The in-flight wavelength calibration for the Ozone Monitoring Instrument is discussed. The observed variability in the wavelength scale is two orders of magnitude larger than caused by temperature changes in the instrument. These wavelength variations are the result of rapid changes in time in the radiance levels during an individual observation in the presence of clouds or snow and ice. We have developed a data processing method to account and correct for these changes. In February 2005 this correction was implemented in the official data processing stream. We explain in detail how and how accurately this method works. Before correction, the error in the wavelength scale can be as much as a few tenths of a pixel; after correction it is mostly less than 1 / 100 th of a pixel, which is the required preflight accuracy. This means that higher-level products such as the total column amounts of ozone, NO 2 , and SO 2 are not significantly affected. It is expected that these wavelength variations will be observed in other hyperspectral Earth observation spectrometers and that the correction mechanism should apply equally well.

© 2006 Optical Society of America

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(280.1310) Remote sensing and sensors : Atmospheric scattering
(300.6190) Spectroscopy : Spectrometers
(300.6540) Spectroscopy : Spectroscopy, ultraviolet
(300.6550) Spectroscopy : Spectroscopy, visible

ToC Category:
Spectroscopy

History
Original Manuscript: October 25, 2005
Revised Manuscript: December 15, 2005
Manuscript Accepted: December 16, 2005

Citation
Robert Voors, Marcel Dobber, Ruud Dirksen, and Pieternel Levelt, "Method of calibration to correct for cloud-induced wavelength shifts in the Aura satellite's Ozone Monitoring Instrument," Appl. Opt. 45, 3652-3658 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-15-3652


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References

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