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A large number of published and unpublished measurements of cloudcondensation nuclei (CCN) concentrations and aerosol optical thickness (AOT)measurements have been analyzed. AOT measurements were obtained mostly fromthe AERONET network, and selected to be collocated as closely as possible tothe CCN investigations. In remote marine regions, CCN0.4 (CCN at asupersaturation of 0.4%) are around 110 cm−3 and the meanAOT500 (AOT at 500 nm) is 0.057. Over remote continental areas, CCN arealmost twice as abundant, while the mean AOT500 is ca. 0.075. (Sitesdominated by desert dust plumes were excluded from this analysis.) Some, ormaybe even most of this difference must be because even remote continentalsites are in closer proximity to pollution sources than remote marine sites.This suggests that the difference between marine and continental levels musthave been smaller before the advent of anthropogenic pollution. Over polluted marine and continental regions, the CCN concentrations areabout one order of magnitude higher than over their remote counterparts,while AOT is about five times higher over polluted than over clean regions.The average CCN concentrations from all studies show a remarkablecorrelation to the corresponding AOT values, which can be expressed as apower law. This can be very useful for the parameterization of CCNconcentrations in modeling studies, as it provides an easily measured proxyfor this variable, which is difficult to measure directly. It also impliesthat, at least at large scales, the radiative and microphysical effects ofaerosols on cloud physics are correlated and not free to vary fullyindependently. While the observed strong empirical correlation isremarkable, it must still be noted that there is about a factor-of-fourrange of CCN concentrations at a given AOT, and that there remainsconsiderable room for improvement in remote sensing techniques for CCNabundance

Correlation between cloud condensation nuclei concentration and aerosol optical thickness in remote and polluted regions