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On the (in)accuracy of the spherical particle approximation in mineral aerosol radiative forcing simulations

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.210
pages 73-76

Michael Kahnert
Swedish Meteorological and Hydrological Institute, Folkborgsvägen 1, S-601 76 Norrköping, Sweden

Timo Nousiainen
University of Helsinki, Finland

Petri Raisanen
Finnish Meteorological Institute, Finland

Résumé

Errors in mineral aerosol radiative forcing computations due to the spherical particle approximation (SPA) and the uncertainty in refractive index were studied. These two error sources are found to be of comparable magnitude, although strongly dependent on optical depth, surface albedo, and particle size. Thus, the use of the SPA in radiative transfer simulations may be among the major error sources in quantifying the regional climate forcing by mineral aerosols.

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