The Stratospheric Aerosol and Gas Experiment (SAGE) III will make multi-spectral measurements of the oxygen A-band absorption feature near 762 nm that can be used to retrieve profiles of temperature and pressure. The retrieval algorithm is based on a global fitting technique that uses a non-linear least squares procedure to simultaneously fit measured absorptivities from all spectral channels and slant paths. The feasibility of this approach is demonstrated through a series of simulated retrievals using synthetic measurements with realistic noise. An assessment of the expected uncertainties associated with the retrieved temperature and pressure data products is also provided.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.