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The activation and hygroscopicity of cloud condensation nuclei (CCN) are keyto the understanding of aerosol–cloud interactions and their impact on climate. They can bemeasured by scanning the particle size and supersaturation in CCNmeasurements. The scanning of supersaturation is often time-consuming andlimits the temporal resolution and performance of CCN measurements. Here wepresent a new approach, termed the broad supersaturation scanning (BS2) method,in which a range of supersaturation is simultaneously scanned, reducing thetime interval between different supersaturation scans. The practicalapplicability of the BS2 approach is demonstrated with nano-CCN measurementsof laboratory-generated aerosol particles. Model simulations show that theBS2 approach may also be applicable for measuring CCN activation of ambientmixed particles. Due to its fast response and technical simplicity, the BS2approach may be well suited for aircraft and long-term measurements. Sincehygroscopicity is closely related to the fraction of organics/inorganics inaerosol particles, a BS2-CCN counter can also serve as a complementarysensor for fast detection/estimation of aerosol chemical compositions

A broad supersaturation scanning (BS2) approach for rapid measurement of aerosol particle hygroscopicity and cloud condensation nuclei activity