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Ambient particle number size distributions spanning three years were used tocharacterize the frequency and intensity of atmospheric dust events in theurban areas of Beijing, China in combination with AERONET sun/sky radiometerdata. Dust events were classified into two types based on the differences inparticle number and volume size distributions and local weather conditions.This categorization was confirmed by aerosol index images, columnar aerosoloptical properties, and vertical potential temperature profiles. During thetype-1 events, dust particles dominated the total particle volumeconcentration (<10 μm), with a relative share over 70%.Anthropogenic particles in the Aitken and accumulation mode played asubordinate role here because of high wind speeds (>4 m s<sup>−1</sup>). Thetype-2 events occurred in rather stagnant air masses and were characterizedby a lower volume fraction of coarse mode particles (on average, 55%).Columnar optical properties showed that the superposition of dust andanthropogenic aerosols in type-2 events resulted in a much higher AOD(average: 1.51) than for the rather pure dust aerosols in type-1 events(average AOD: 0.36). A discrepancy was found between the ground-based andcolumn integrated particle volume size distributions, especially for thecoarse mode particles. This discrepancy likely originates from both thelimited comparability of particle volume size distributions derived from Sunphotometer and in situ number size distributions, and the inhomogeneousvertical distribution of particles during dust events

Dust events in Beijing, China (2004–2006): comparison of ground-based measurements with columnar integrated observations