Atmospheric Chemistry Program Seminar
Chemistry of Organic Compounds in the Atmosphere and Indoor Air by Prof. Paul Ziemann, CU Boulder and Recent Results and Upcoming Projects to Investigate Aerosol Sources, Properties, Processes, and Fate by Prof Jose-Luis Jimenez, CU Boulder
Chemistry of Organic Compounds in the Atmosphere and Indoor Air
Recent Results and Upcoming Projects to Investigate Aerosol Sources, Properties, Processes, and Fate
"Organic aerosols (OA) account for about 1/2 of the submicron particle mass in the atmosphere leading to important impacts on climate, human health, and other issues, but their sources, properties, and evolution are poorly understood. In this talk I will present an overview and highlights of research on OA instrumentation, measurements, and modeling by our group over the last year, as well as of upcoming projects of potential interest to 1st year students. Ongoing projects include global aerosol measurements and analysis as part of the NASA ATOM project, which is sampling (almost) pole-to-pole across the vertical profile. Initial model comparisons suggest the importance of fast OA removal channels. We have used an Oxidation Flow Reactor (OFR) at multiple field studies and find consistent patterns, where SOA formation by O3 and NO3 are consistent with models, while formation by OH is substantially underpredicted unless semivolatile and intermediate volatility species are accounted for. We are using the GECKO-A fully explicit model to investigate this underprediction, as well as to characterize the similarities and differences of the chemical regimes across the OFR, large chambers, and the atmosphere. We are investigating gas/particle partitioning in the laboratory for different types of particles. Finally, we are continuing to explore the chemistry of indoor air with ToF-CIMS and other instruments. Future outdoor campaigns may include the study of emissions and chemical evolution of smoke from real fires in the western US (NASA FireChem) with AMS and soft-ionization EESI-TOF. Future indoor campaigns will involve sampling at locations such as dining halls, gyms, and art museums."
CMC End of Summer meeting
CIRES Members Council Introduction/Open Meeting
Please feel free to bring your lunch; we will provide coffee and cookies. CMC meetings are open to all CIRES employees, and every employee has a CMC representative.