Stratospheric minor species densities from satellite measurements of scattered sunlight.

摘要

The Optical Spectrograph and InfraRed Imager System (OSIRIS) is a Canadian instrument on board the Odin satellite which measures the densities of ozone and related trace gases. Accurate measurements are needed in order to assess global ozone concentrations and determine future changes and their potential impact. OSIRIS uses a new method which measures the spectra of scattered sunlight in the stratosphere using a limb-viewing configuration. OSIRIS provides near-global coverage and allows for the determination of vertical density profiles of trace gases by applying the differential optical absorption spectroscopy (DOAS) technique. DOAS uses the differential ratio of measured OSIRIS radiances to generate a column density profile from which local number density profiles are recovered through an inversion process. A comparison of stratospheric ozone profiles in the Huggins and Chappuis band spectral regions is presented, in addition to BrO profiles and some of the first OC10 number density profiles.