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. Both frequency and intensity of rainfall affect aerosol wetdeposition. With a stochastic deep convection scheme implemented into twostate-of-the-art global climate models (GCMs), a recent study found thataerosol burdens are increased globally by reduced climatological mean wetremoval of aerosols due to suppressed light rain. Motivated by their work, anovel approach is developed in this study to detect what rainfall rates aremost efficient for wet removal (scavenging amount mode) of different aerosolspecies of different sizes in GCMs and applied to the National Center forAtmospheric Research Community Atmosphere Model version 5 (CAM5) with andwithout the stochastic convection cases. Results show that in the standardCAM5, no obvious differences in the scavenging amount mode are found amongdifferent aerosol types. However, the scavenging amount modes differ in theAitken, accumulation and coarse modes, showing around 10–12, 8–9 and 7–8 mm d−1, respectively, over the tropics. As latitude increases poleward, thescavenging amount mode in each aerosol mode is decreased substantially. Thescavenging amount mode is generally smaller over land than over ocean. Withstochastic convection, the scavenging amount mode for all aerosol species ineach mode is systematically increased, which is the most prominent along theIntertropical Convergence Zone, exceeding 20 mm d−1 for small particles.The scavenging amount modes in the two cases are both smaller thanindividual rainfall rates associated with the most accumulated rain(rainfall amount mode), further implying precipitation frequency is moreimportant than precipitation intensity for aerosol wet removal. The notionof the scavenging amount mode can be applied to other GCMs to betterunderstand the relation between rainfall and aerosol wet scavenging, whichis important to better simulate aerosols.

What rainfall rates are most important to wet removal of different aerosol types?