1. Cloud Condensation Nuclei Concentrations
Göran Frank, Duli Chand, Michael Welling, Pascal Guyon, Meinrat O. Andreae
Max Planck Institute for Chemistry, Mainz, Germany

2. Cloud Condensation Nuclei (CCN)
The ability of an aerosol particle to act as a CCN is determined by:
Size
Chemical composition
The cloud droplet size distribution formed is also depending on:
Number of aerosol particles
The maximum supersaturation achieved

3. Instrumentation CCN-Mainz CCN-Hannover Thermal gradient type
INPE Aircraft
Fazenda Nossa Senhora
CCN-Hannover
Expansion type
Fazenda Nossa Senhora

4. Thermal gradient parallel plate type CCN counter
(CCN-Mainz)
Laser

9. CCN Hannover Fazenda Nossa Senhora
Data available for the period September 16 – November 14.

10. Work to be done Continue data evaluation Quality validation
CCN/CN ratios
Link aerosol particle size distribution, aerosol chemical properties and hygroscopic properties of aerosol particles to cloud-nucleating properties, including CCN concentrations and CCN/CN ratios (WP 3)