Research
Gas-particle reactions of reactive nitrogen represent an important but variable atmospheric chemical cycle. For example, uptake of N2O5to aerosol regulates the lifetime of NOx(=NO+NO2) and oxidant burdens in the troposphere.
Biogenic VOC from terrestrial vegetation (e.g., isoprene, monoterpenes) and biogenic marine sulfur compounds (e.g., dimethyl sulfide, DMS) undergo rapid nocturnal degradation in the presence of the nitrate radical, NO3. Since NO3 is derived
Several regions of the United States, particularly in the west, experience poor air quality during winter meteorological conditions that confine local emissions in shallow layers near the surface. However, different regions have widely different
Wildfire frequency and intensity is increasing in western North America, with impacts on regional air quality and climate. The FIREX-AQ initiative is a set of laboratory and field studies designed to provide detailed understanding of the
Aerosols both scatter and absorb incoming solar radiation, influencing Earth's climate. Recent developments of visible cavity ring-down and photoacoustic instruments have enabled new and detailed understanding of ambient aerosol optical properties.
Direct absorption spectroscopy is an absolute technique for measurement of atmospheric trace gases and aerosol extinction that has been traditionally limited in atmospheric science applications because of its low sensitivity. Optical cavities (e.g