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3. Radiative transfer model

The model used here is described in Sarkissian et al., [1995b]. The single-scattering part uses the flux calculation scheme of Solomon et al. [1987]; the double-scattering part, albedo and refraction are not used in this paper. The model has been subjected to an intercomparison between different models (single scattering, Monte-Carlo, numerical integration) which shows that AMFs averaged from 86¡ to 91¡ SZA agree within ± 1% for ozone at 510 nm [Sarkissian et al., 1995a]. Sensitivities of the AMFs to vertical profiles of constituents, air density (temperature) and stratospheric scatterers (background aerosol, tropospheric cloud, volcanic aerosol and polar stratospheric cloud) is studied in Sarkissian et al. [1995b].

The radiative transfer model calculates also the colour index as defined previously for SAOZ measurements.

Figure 1: Correction to SAOZ AMF due to ozone and temperature seasonal changes for various periods and latitudes (values are from Sarkissian et al., 1995b).

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