This study is the first to connect a commercial condensation nuclei chamber, or CCNC, with a pumped counterflow virtual impactor (PCVI) and mass spectrometers to study the chemistry of aerosol particles that activate to cloud droplets. A CCNC was used to supersaturate particles to form cloud droplets. All particles were immediately pushed from the CCNC through a PCVI using inertia to separate the droplets from inactivated particles. After separation, the droplets were chemically analyzed. We used two complementary mass spectrometry techniques, an aerosol mass spectrometer and a particle analysis by laser mass spectrometer, to chemically characterize the residual material. This procedure was validated to show that only droplets of a certain size made it through the PCVI for analysis, and our method can be used in real-life scenes to characterize these promising particles. Newly developed continuous-flow environmental chamber at PNNL and associated experimental works (e.g., the influence of RH on the chemical and physical properties of á-pinene secondary organic aerosol particles at low mass loading) will also briefly be introduced. Reference: Hiranuma N, M Kohn, MS Pekour, DA Nelson, JE Shilling and DJ Cziczo. 2011. “Droplet Activation, Separation, and Compositional Analysis: Laboratory Studies and Atmospheric Measurements,” Atmospheric Measurement Techniques, 4, 2333-2343. DOI:10.5194/amt-4-2333-2011.

Diese Veranstaltung ist Teil der Reihe Aerosolphysikalisches Seminar

Referent/in
Dr. Naruki Hiranuma

Pacific Northwest National Laboratory
Atmospheric Sciences & Global Change Division

Veranstalter
Institut für Meteorologie und Klimaforschung
Karlsruher Institut für Technologie (KIT)
Hermann von Helmholtz Platz 1
76344 Eggenstein-Leopoldshafen
Tel: 0721-608-0
E-Mail: sekretariat ∂does-not-exist.imk-asf kit edu

Zielgruppe
Wissenschaftliche Mitarbeitende