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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 12 — Apr. 20, 2003
  • pp: 2155–2165

Use of high-resolution measurements for the retrieval of temperature and gas-concentration profiles from outgoing infrared spectra in the presence of cirrus clouds

Xianglei L. Huang, Yuk L. Yung, and Jack S. Margolis  »View Author Affiliations


Applied Optics, Vol. 42, Issue 12, pp. 2155-2165 (2003)
http://dx.doi.org/10.1364/AO.42.002155


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Abstract

We explore ways in which high-spectral-resolution measurements can aid in the retrieval of atmospheric temperature and gas-concentration profiles from outgoing infrared spectra when optically thin cirrus clouds are present. Simulated outgoing spectra that contain cirrus are fitted with spectra that do not contain cirrus, and the residuals are examined. For those lines with weighting functions that peak near the same altitude as the thin cirrus, unique features are observed in the residuals. These unique features are highly sensitive to the resolution of the instrumental line shape. For thin cirrus these residual features are narrow (≤0.1 cm-1), so high spectral resolution is required for unambiguous observation. The magnitudes of these unique features are larger than the noise of modern instruments. The sensitivities of these features to cloud height and cloud optical depth are also discussed. Our sensitivity studies show that, when the errors in the estimation of temperature profiles are not large, the dominant contribution to the residuals is the misinterpretation of cirrus. An analysis that focuses on information content is also presented. An understanding of the magnitude of the effect and of its dependence on spectral resolution as well as on spectral region is important for retrieving spacecraft data and for the design of future infrared instruments for forecasting weather and monitoring greenhouse gases.

© 2003 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(010.1310) Atmospheric and oceanic optics : Atmospheric scattering
(010.3920) Atmospheric and oceanic optics : Meteorology

History
Original Manuscript: August 21, 2002
Revised Manuscript: January 2, 2003
Published: April 20, 2003

Citation
Xianglei L. Huang, Yuk L. Yung, and Jack S. Margolis, "Use of high-resolution measurements for the retrieval of temperature and gas-concentration profiles from outgoing infrared spectra in the presence of cirrus clouds," Appl. Opt. 42, 2155-2165 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-12-2155

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