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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 33 — Nov. 20, 2002
  • pp: 7068–7078

Retrieval of CO from nadir remote-sensing measurements in the infrared by use of four different inversion algorithms

Cathy Clerbaux, Juliette Hadji-Lazaro, Sébastien Payan, Claude Camy-Peyret, Jinxue Wang, David P. Edwards, and Ming Luo  »View Author Affiliations


Applied Optics, Vol. 41, Issue 33, pp. 7068-7078 (2002)
http://dx.doi.org/10.1364/AO.41.007068


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Abstract

Four inversion schemes based on various retrieval approaches (digital gas correlation, nonlinear least squares, global fit adjustment, and neural networks) developed to retrieve CO from nadir radiances measured by such downward-looking satelliteborne instruments as the Measurement of Pollution in the Troposphere (MOPITT), the Tropospheric Emission Spectrometer (TES), and the Infrared Atmospheric Sounding Interferometer (IASI) instruments were compared both for simulated cases and for atmospheric spectra recorded by the Interferometric Monitor for Greenhouse Gases (IMG). The sensitivity of the retrieved CO total column amount to properties that may affect the inversion accuracy (noise, ancillary temperature profile, and water-vapor content) was investigated. The CO column amounts for the simulated radiance spectra agreed within 4%, whereas larger discrepancies were obtained when atmospheric spectra recorded by the IMG instrument were analyzed. The assumed vertical temperature profile is shown to be a critical parameter for accurate CO retrieval. The instrument’s line shape was also identified as a possible cause of disagreement among the results provided by the groups of scientists who are participating in this study.

© 2002 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(010.7030) Atmospheric and oceanic optics : Troposphere
(280.1120) Remote sensing and sensors : Air pollution monitoring
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6340) Spectroscopy : Spectroscopy, infrared

History
Original Manuscript: February 18, 2002
Revised Manuscript: July 1, 2002
Published: November 20, 2002

Citation
Cathy Clerbaux, Juliette Hadji-Lazaro, Sébastien Payan, Claude Camy-Peyret, Jinxue Wang, David P. Edwards, and Ming Luo, "Retrieval of CO from nadir remote-sensing measurements in the infrared by use of four different inversion algorithms," Appl. Opt. 41, 7068-7078 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-33-7068

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