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Shinozuka, Y.,Clarke, A. D.,Nenes, A.,Jefferson, A.,Wood, R.,McNaughton, C. S.,Strö,m, J.,Tunved, P.,Redemann, J.,Thornhill, K. L.,Moore, R. H.,Lathem, T. L.,Lin, J. J.,Yoon, Y. J. Copernicus GmbH 2015 Atmospheric chemistry and physics Vol.15 No.13
<P>Abstract. We examine the relationship between the number concentration of boundary-layer cloud condensation nuclei (CCN) and light extinction to investigate underlying aerosol processes and satellite-based CCN estimates. For a variety of airborne and ground-based observations not dominated by dust, regression identifies the CCN (cm−3) at 0.4 ± 0.1% supersaturation with 100.3α +1.3σ0.75 where σ (Mm−1) is the 500 nm extinction coefficient by dried particles and α is the Angstrom exponent. The deviation of 1 km horizontal average data from this approximation is typically within a factor of 2.0. ∂logCCN / ∂logσ is less than unity because, among other explanations, growth processes generally make aerosols scatter more light without increasing their number. This, barring special meteorology-aerosol connections, associates a doubling of aerosol optical depth with less than a doubling of CCN, contrary to previous studies based on heavily averaged measurements or a satellite algorithm. </P>