We investigate processes controlling interactions among pollutant emissions, regional air quality, global atmospheric composition, and climate, using chemistry-transport and chemistry-climate models alongside in situ and remotely sensed observations.


Air Pollution

Ozone in surface air in many locations reflects a balance of production from local-to-regional anthropogenic and natural sources and of transport.  We aim to quantify the relative contributions to ozone pollution, with a heavy focus on the United States.  Knowing the ‘break-down’ of sources contributing to surface ozone pollution is needed to set attainable standards… READ MORE!!


Chemistry-Climate Connections

We seek to understand factors controlling chemistry-climate interactions including the two-way couplings between air pollutants and climate.  Reducing emissions of some near-term climate forcing agents (NTCFs) such as methane, ozone, and some aerosols offers the potential to address jointly climate and air quality goals.  We also study the impacts of climate change on air pollution… READ MORE!!


Trends and Variability in Atmospheric Constituents

We are studying the processes that influence daily-to-decadal variability and long-term trends in key atmospheric species.  Our work to date has largely focused on ozone and methane (see publications).  Current projects seek to identify proxies for variability in atmospheric oxidizing capacity (OH) on several scales (hourly-to-daily at local scales and inter-annual-to-decadal at the global scale)… READ MORE!!


Biosphere-Atmosphere Interactions

Our interests include interactions between vegetation and atmospheric chemistry, climate, and air pollution.  Current projects explore the potential for new measurements to constrain isoprene-NOx-ozone chemistry, and the role of dry deposition, an often overlooked yet important loss pathway for numerous trace species, in contributing to hourly to inter-annual variability in ozone, aerosols, and their precursors… READ MORE!!