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Cloud condensation nucleus (CCN) experiments were carried out for malonicacid, succinic acid, oxalacetic acid, DL-malic acid, glutaric acid,DL-glutamic acid monohydrate, and adipic acid, using both water and methanolas atomization solvents, at three operating supersaturations (0.11%,0.21%, and 0.32%) in the Caltech three-column CCN instrument (CCNC3).Predictions of CCN behavior for five of these compounds were made using theAerosol Diameter Dependent Equilibrium Model (ADDEM). The experimentspresented here expose important considerations associated with thelaboratory measurement of the CCN behavior of organic compounds. Choice ofatomization solvent results in significant differences in CCN activation forsome of the compounds studied, which could result from residual solvent,particle morphology differences, and chemical reactions between the particleand gas phases. Also, significant changes in aerosol size distributionoccurred after classification in a differential mobility analyzer (DMA) formalonic acid and glutaric acid, preventing confident interpretation ofexperimental data for these two compounds. Filter analysis of adipic acidatomized from methanol solution indicates that gas-particle phase reactionsmay have taken place after atomization and before methanol was removed fromthe sample gas stream. Careful consideration of these experimental issues isnecessary for successful design and interpretation of laboratory CCNmeasurements

Cloud condensation nucleus (CCN) behavior of organic aerosol particles generated by atomization of water and methanol solutions