Partner: Aarhus University; Cyprus Institute
PI: Prof. Andreas Massling ([email protected]); Prof. George Biskos ([email protected]); Prof. Athanasios Nenes ([email protected])
Operator: Dr.Lu Zhang (Aarhus University); Dr.Romanos Foskinis (LTE+LAPI/EPFL); Prof.Nenes Athanasios (LAPI/EPFL, CSTACC/FORTH)
The Droplet Measurement Technologies (DMT) Cloud Condensation Nuclei Counter (CCN) is based on the Continuous Flow Streamwise Thermal Gradient Chamber design of Roberts and Nenes, AST, (2005). The instrument CCN measures aerosol particles that can form into cloud droplets at a given level of water vapor supersaturation. The instrument operates by supersaturating sample air to the point the where the CCN become detectable particles, which are then sized using an optical particle counter and distributed into 20 bins. Supersaturation is generated by relative diffusion of warm(saturated) water vapor into colder(saturated) air, and can be controlled by the flow rate and streamwise temperature gradient maintained in the instrument. The technology is patented and licensed for manufacturing by DMT.
One CCN column is operated at the (HAC)2 site and another is at the low altitude station. Both instruments are operated at Scanning Mobility CCN Analysis (SMCA) mode (Moore et al., 2010), and Scanning Flow CCN Analysis (SFCA) mode (Moore et al., 2009).