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The water-soluble fractions of aerosol filter samples and cloud watercollected during the Whistler Aerosol and Cloud Study (WACS 2010) wereanalyzed using an Aerodyne aerosol mass spectrometer (AMS). This is thefirst study to report AMS organic spectra of re-aerosolized cloud water, andto make direct comparison between the AMS spectra of cloud water and aerosolsamples collected at the same location. In general, the mass spectra ofaerosol were very similar to those of less volatile cloud organics. By usinga photochemical reactor to oxidize both aerosol filter extracts and cloudwater, we find evidence that fragmentation of water-soluble organics inaerosol increases their volatility during photochemical oxidation. Bycontrast, enhancement of AMS-measurable organic mass by up to 30% wasobserved during the initial stage of oxidation of cloud water organics,which was followed by a decline at the later stages of oxidation. Theseobservations are in support of the general hypothesis that cloud wateroxidation is a viable route for SOA formation. In particular, we proposethat additional SOA material was produced by functionalizing dissolvedorganics via OH oxidation, where these dissolved organics are sufficientlyvolatile that they are not usually part of the aerosol. This workdemonstrates that water-soluble organic compounds of intermediate volatility(IVOC), such as <i>cis</i>-pinonic acid, produced via gas-phase oxidation ofmonoterpenes, can be important aqueous-phase SOA precursors in abiogenic-rich environment

atmospheric chemistry and physics

Characterization of aerosol and cloud water at a mountain site during WACS 2010: secondary organic aerosol formation through oxidative cloud processing