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<p><strong>Abstract.</strong> Errors in the sun photometer calibration constant lead to artificial diurnal variations, symmetric around solar noon, of the retrieved aerosol optical depth (AOD) and the associated Ångström exponent &alpha; and its curvature &gamma;. We show in simulations that within the uncertainty of state-of-the-art Langley calibrations, these diurnal variations of &alpha; and &gamma; can be significant in low AOD conditions, while those of AOD are negligible.doi:10.5194/amt-6-99-2013 fatcat:ngpaako36fhenjl2whufb5b3iq