The influence of chemical composition and mixing state of Los Angeles urban aerosol on CCN number and cloud properties

Interactive comment on “The influence of chemical composition and mixing state of Los Angeles urban aerosol on CCN number and cloud properties” by M. J. Cubison et al

Activation of LA aerosol

The influence of chemical composition and mixing state of Los Angeles urban aerosol on CCN number and cloud properties M. J. Cubison, B. Ervens, G. Feingold, K. S. Docherty, I. M. Ulbrich, L. Shields, K. Prather, S. Hering, and J. L. Jimenez Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, Boulder, CO, USA Atmospheric Science Department, Colorado...

CCN predictions using simplified assumptions of organic aerosol composition and mixing state: a synthesis from six different locations

An accurate but simple quantification of the fraction of aerosol particles that can act as cloud condensation nuclei (CCN) is needed for implementation in large-scale models. Data on aerosol size distribution, chemical composition, and CCN concentration from six different locations have been analyzed to explore the extent to which simple assumptions of composition and mixing state of the organi...

CCN Activity, Variability and Influence on Droplet Formation during the HygrA-Cd Campaign in Athens

Measurements of cloud condensation nuclei (CCN) concentrations (cm−3) at five levels of supersaturation between 0.2–1%, together with remote sensing profiling and aerosol size distributions, were performed at an urban background site of Athens during the Hygroscopic Aerosols to Cloud Droplets (HygrA-CD) campaign. The site is affected by local emissions and long-range transport, as portrayed by ...

Cloud Condensation Nuclei (CCN) closure during the ICARTT 2004 campaign: a) effects of size-resolved composition

Measurements of Cloud Condensation Nuclei (CCN), aerosol size distribution and chemical composition were obtained at the UNH-AIRMAP Thompson Farms site, during the ICARTT 2004 campaign. This work focuses on the analysis of a week of measurements, during which semi-urban and continental air were sampled. Predictions of CCN concentrations were carried out using “simple” Köhler theory; the predict...