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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 33 — Nov. 20, 2008
  • pp: 6277–6284

Atmospheric hydroxyl radical (OH) abundances from ground-based ultraviolet solar spectra: an improved retrieval method

Ross Cheung, King Fai Li, Shuhui Wang, Thomas J. Pongetti, Richard P. Cageao, Stanley P. Sander, and Yuk L. Yung  »View Author Affiliations

Applied Optics, Vol. 47, Issue 33, pp. 6277-6284 (2008)

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The Fourier Transform Ultraviolet Spectrometer (FTUVS) instrument has recorded a long-term data record of the atmospheric column abundance of the hydroxyl radical (OH) using the technique of high resolution solar absorption spectroscopy. We report new efforts in improving the precision of the OH measurements in order to better model the diurnal, seasonal, and interannual variability of odd hydrogen ( HO x ) chemistry in the stratosphere, which, in turn, will improve our understanding of ozone chemistry and its long-term changes. Until the present, the retrieval method has used a single strong OH absorption line P 1 ( 1 ) in the near-ultraviolet at 32 , 341 cm 1 . We describe a new method that uses an average based on spectral fits to multiple lines weighted by line strength and fitting precision. We have also made a number of improvements in the ability to fit a model to the spectral feature, which substantially reduces the scatter in the measurements of OH abundances.

© 2008 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6540) Spectroscopy : Spectroscopy, ultraviolet
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: November 5, 2007
Revised Manuscript: September 17, 2008
Manuscript Accepted: September 19, 2008
Published: November 19, 2008

Ross Cheung, King Fai Li, Shuhui Wang, Thomas J. Pongetti, Richard P. Cageao, Stanley P. Sander, and Yuk L. Yung, "Atmospheric hydroxyl radical (OH) abundances from ground-based ultraviolet solar spectra: an improved retrieval method," Appl. Opt. 47, 6277-6284 (2008)

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