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

A retrieval technique for use with high resolution IR solar occultation limb sensing data is described for profiling stratospheric trace constituents. Remote measurement of CIO 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(-1). 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.