Laura Lund University of Arizona Dr. William Conant Atmospheric Aerosols Laura Lund University of Arizona Dr. William Conant

Aerosols Bi-products of chemical reactions Nano- to micro-meters in size Influence the Atmosphere Affect air quality Scatter light Cloud condensation nuclei Difficult to sample

Climate Effects Increased light scattering due to pollution aerosols may cool atmosphere Cooling effect regional versus greenhouse effect everywhere Cannot currently model outcome of warming and cooling in different regions Effective sampling system needed to further studies

Sampling System Electrostatic Classifier Differential Mobility Analyzer Ultra-fine Condensation Particle Counter National Instruments Labview Data Acquisition

Electrostatic Classifier Kr-85 Aerosol Neutralizer Differential Mobility Analyzer Charged aerosols attracted to collector rod based on voltage applied and aerosol size Monodisperse aerosol exits center of DMA Remaining aerosols exit through excess air Monodispese aerosol fed to CPC to be counted

Particle Counter Aerosol stream passed through supersaturated n-butyl alcohol Alcohol condenses on particles Stream enters optical detector Lenses collect laser light scattered by droplets to count particles Concentration data recorded by Labview Size distribution determined and analyzed

Preliminary Results Note: 10V=15.4 nm 1000V=160 nm

Implications Facilitate data collection of atmospheric aerosols Evaluate models of mid-tropospheric aerosols used in NASA’s CALIPSO mission Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation Atmospheric tracers to study movement of Earth’s atmosphere

Thank you Any Questions?