Rayleigh optical depth calculations for polar atmospheres

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Scientific paper

Molecular scattering is a key process in the attenuation of solar radiation during its passage through the terrestrial atmosphere. Precise calculations of the Rayleigh optical depth are required for different applications. An extension of the analysis made by Bucholtz (1995) is presented, consisting in calculations of the Rayleigh optical depth from 0.3 to 4.0 micron, paying attention to the dispersion with wavelength of the depolarization factor. Calculations are improved taking into account carbon dioxide and water vapour effects. Rayleigh optical depths are then calculated for a January 75S model derived by analyzing a twelve-year data-set of radiosoundings collected at Terra Nova Bay (Antarctica) and for the "Artic(75N) atmosphere, January" and "Artic(75N)Atmosphere, July" models (Sissenwine, 1969). Bucholtz A., 1995, Rayleigh-scattering calculations for the terrestrial atmosphere, Applied Optics,vol.34, no.15, pp 2765-2773. Sissenwine N., Standard and Supplemental Atmospheres in Climate of the Free Atmosphere, edited by D.F. Rex,1969,- Climate of the Free Atmosphere; pp. 5-44, World Survey of Climatology, vol4, Elsevier Publ.Co, Amsterdam, 1969.

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