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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 29 — Oct. 10, 2007
  • pp: 7162–7171

Retrieval of atmospheric ozone profiles from an infrared quantum cascade laser heterodyne radiometer: results and analysis

Damien Weidmann, William J. Reburn, and Kevin M. Smith  »View Author Affiliations


Applied Optics, Vol. 46, Issue 29, pp. 7162-7171 (2007)
http://dx.doi.org/10.1364/AO.46.007162


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Abstract

Following the recent development of a ground-based prototype quantum cascade laser heterodyne radiometer operating in the midinfrared, atmospheric ozone profile retrievals from a solar occultation measurement campaign performed at the Rutherford Appleton Laboratory on 21 September 2006 are presented. Retrieval is based on the optimal estimation method. High resolution ( 0.0073 cm 1 ) atmospheric spectra recorded by the laser heterodyne radiometer and covering a microwindow ( 1033.8 1034.5 cm 1 ) optimized for atmospheric ozone measurements were used as measurement vectors. As part of the evaluation of this novel instrument, a comprehensive analysis of the retrievals is presented, demonstrating the high potential of quantum cascade laser heterodyne radiometry for atmospheric sounding. Vertical resolutions of 2 km near the ground and about 3 km in the stratosphere were obtained. The information content of the retrieval was found to be up to 48 bits, which is much higher than any other passive ground-based instrument. Frequency mismatches of several absorption peaks between the forward model and experimental spectra have been observed and significantly contribute to the retrieval noise error in the upper-troposphere lower-stratosphere region. Retrieved ozone vertical profiles were compared to ozonesonde data recorded at similar latitudes. The agreement is generally excellent except for the 20 to 25 km peak in ozone concentration, where ozonesonde data were found to be 20% lower than the amount retrieved from the laser heterodyne radiometer spectra. Quantum cascade laser based heterodyne radiometry in the midinfrared has been demonstrated to provide high spectral resolution and unprecedented vertical resolution for a passive sounder in a highly compact and mechanically simple package.

© 2007 Optical Society of America

OCIS Codes
(010.4950) Atmospheric and oceanic optics : Ozone
(040.2840) Detectors : Heterodyne
(040.3060) Detectors : Infrared
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.5630) Instrumentation, measurement, and metrology : Radiometry

ToC Category:
Detectors

History
Original Manuscript: June 14, 2007
Revised Manuscript: August 21, 2007
Manuscript Accepted: August 22, 2007
Published: October 4, 2007

Citation
Damien Weidmann, William J. Reburn, and Kevin M. Smith, "Retrieval of atmospheric ozone profiles from an infrared quantum cascade laser heterodyne radiometer: results and analysis," Appl. Opt. 46, 7162-7171 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-29-7162

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