Research

      Organic aerosol         Halogen chemistry         Reactive nitrogen     Heterogeneous chemistry        Ship emissions

 

Overview:

Our research projects are generally geared toward improving our understanding of regional and global tropospheric oxidation chemistry, and its relation to air quality and climate, through a combination of field measurements, laboratory process studies, and computer modeling.

In particular, we are interested in both the daytime and nighttime chemistry of nitrogen oxide radicals, which act as catalysts for ozone production, controls on the OH radical, and as a source of nitrogen to ecosystems. Nocturnal nitrogen oxide chemistry, via NO3 and N2O5, involves heterogeneous reactions on aerosols and reactions with biogenic volatile organic compounds with implications for aerosol mass (and therefore climate forcings) and halogen chemistry in the polluted marine boundary layer.

We are thus also interested in the effects of oxidants as sources and sinks of aerosol organic mass, and the role of heterogeneous chemistry generally, but specifically that involved in the removal of nitrogen oxides, and the activation and recycling of halogen species.

As part of these efforts we focus on the development of field deployable detection technologies involving selected-negative ion chemical ionization mass spectrometry and unique kinetic and product studies of heterogeneous chemistry in the laboratory. Our research has been funded through grants from the NSF, NASA, DOE, CARB, as well as the University of Washington.