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In this study we show how size-resolved measurements of aerosol particlesand cloud condensation nuclei (CCN) can be used to characterize thesupersaturation of water vapor in a cloud. The method was developed andapplied during the ACRIDICON-Zugspitze campaign (17 September to 4 October 2012) atthe high-Alpine research station Schneefernerhaus (German Alps, 2650 m a.s.l.).Number size distributions of total and interstitial aerosol particles weremeasured with a scanning mobility particle sizer (SMPS), and size-resolvedCCN efficiency spectra were recorded with a CCN counter system operated atdifferent supersaturation levels. During the evolution of a cloud, aerosol particles are exposed to differentsupersaturation levels. We outline and compare different estimates for thelower and upper bounds (Slow, Shigh) and the average value(Savg) of peak supersaturation encountered by the particles in thecloud. A major advantage of the derivation of Slow and Savg fromsize-resolved CCN efficiency spectra is that it does not require thespecific knowledge or assumptions about aerosol hygroscopicity that areneeded to derive estimates of Slow, Shigh, and Savg from aerosolsize distribution data. For the investigated cloud event, we derivedSlow ≈ 0.07–0.25%, Shigh ≈ 0.86–1.31% and Savg ≈ 0.42–0.68%

Assessment of cloud supersaturation by size-resolved aerosol particle and cloud condensation nuclei (CCN) measurements