Chemistry Department Seminar Eben Cross Massachusettes Institute of Technology " From Cookstoves to Combustion Engines: How real-time aerosol mass spectrometry is improving our understanding of the climate and air quality impacts of combustion emissions."
- 3/28/2014 |
3:00 PM – 4:00 PM
Location: Druckenmiller Hall, Room 020
Event Type: Seminar
We are all familiar with the sights, sounds, and smells of incomplete combustion whether from a diesel bus at the corner of a busy intersection, a backyard barbeque, or a neglected piece of toast in the toaster-oven. Each of these ‘plume events’ is comprised of a complex mix of particulate and gas phase species whose chemical composition, phase, and concentration vary dramatically across tight spatial domains (~ meters) and fast temporal scales (~ seconds). Over the past decade, the development of real-time, quantitative, field-deployable instrumentation has provided a more detailed characterization of the physical and chemical properties of near-field combustion emissions. In this seminar I will present results obtained with two recently developed mass spectrometry tools; the Soot-Particle Aerosol Mass Spectrometer (SP-AMS) for measurement of refractory (black carbon, metals) and non-refractory (organic and inorganic) particulate matter and the Total Gas phase Organics (TGO) instrument for measurement of intermediate and semi-volatile organic gas phase species. Results from three combustion systems will be discussed: a Haitian cookstove, a gas-turbine jet engine, and a medium duty diesel engine. Collectively, the air quality and climate impacts of these combustion systems span local, regional, and global scales, further motivating the continued development of analytical techniques such as those introduced in this talk.