The third Pallas Cloud Experiment: Consistency between the aerosol hygroscopic growth and CCN activity. Jaatinen, A., Romakkaniemi, S., Hao, L., Q., Kortelainen, A., Miettinen, P., Mikkonen, S., Smith, J., N., Virtanen, A., Laaksonen, A., Anttila, T., Hyvärinen, A., P., Smith, J., N., Laaksonen, A., Smith, J., N., & Romakkaniemi, S. Boreal Environment Research, 19:368-382, 2014.
The third Pallas Cloud Experiment: Consistency between the aerosol hygroscopic growth and CCN activity [pdf]Website  abstract   bibtex   
Measurements of aerosol chemical and hygroscopic properties and cloud\ncondensation nuclei were carried out as a part of the third Pallas Cloud\nExperiment. In this study, the aerosol hygroscopicity parameter, kappa,\nwas determined using data from instruments operating in the\nsub-saturated and supersaturated water vapour regimes, as well as from\nmeasurements of aerosol chemical composition. During the campaign, kappa\nvaried from similar to 0.01 to similar to 0.37 as derived by Cloud\nCondensation Nuclei counter and Hygroscopic Tandem Differential Mobility\nanalyser data, and from similar to 0.13 to similar to 0.60 as derived\nfrom Aerosol Mass Spectrometer data, the average values being 0.11 and\n0.29, respectively. CCN closure calculations showed that the\nsub-saturated growth factor retrieved CCN concentration is lower than\nthe measured one. Overall, at the Pallas site, aerosol hygroscopicity\nwas size dependent with hygroscopicity increasing with size. Hence, size\ndependent information on composition is needed to predict CCN\nconcentrations relevant to cloud droplet formation.

Downloads: 0