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Although mineral aerosol (dust) particles are irregular in shape, they are treated as homogeneous spheres in climate model radiative transfer calculations. Here, we test the effect of dust particle non‐sphericity in the ECHAM5.5‐HAM2 global aerosol–climate model. The short‐wave optical properties of the two insoluble dust modes in HAM2 are modelled using an ensemble of spheroids that has been optimized...
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