Stratospheric trace constituent profile retrievals using laser heterodyne radiometer IR limb sensing spectra

Physics – Optics

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Atmospheric Composition, Infrared Radiometers, Laser Spectroscopy, Stratosphere, Trace Contaminants, Chlorine Oxides, Data Retrieval, Error Analysis, Infrared Spectra, Optical Heterodyning, Solar Limb, Stellar Occultation

Scientific paper

A retrieval technique for high resolution IR solar occultation limb sensing data is described for profiling stratospheric trace constituents. Remote measurement of ClO during sunset in the 24-45-km region with a 2-km height resolution is chosen as an example. Two types of instruments are considered: a laser heterodyne radiometer with line resolving spectral resolution and an interferometer spectrometer with a fixed slit width of 0.02/cm. It is pointed out that a multichannel approach is necessary with the heterodyne instrument for improved retrieval accuracy. The error analysis indicates the relative sizes of instrument noise and other sources of error in the retrieval of altitude profiles with high (2-km) vertical resolution.

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