Regional and Global Air Quality
The main goal is to understand and quantify the impact of urban emissions on air quality. Priority is given to studying the large-scale impacts of intense emissions originating from megacities (and large urban areas) and the multiphase (gas-aerosol-cloud) processes that transform pollutants in the atmosphere. In order to address these priorities ACD scientists:
1) organize and participate in field campaigns, such as the large scale MIRAGE campaign in
Mexico City in 2006 and the smaller scale campaign in Finland in 2007,
2) develop, deploy, and maintain the airborne and ground based instrumentation required to understand photochemistry and aerosol formation and composition,
3) develop and utilize process, regional, and global scale models to fully understand the impact of urban emissions on air quality,
4) develop and utilize measurements from spaceborne instruments to characterize and quantify pollution, aerosols, and transport.
Chemistry in the Climate System
The goals are to understand the interactions between
the physical climate system, the chemical climate system, and the biosphere.
Priority is given:
1) to the simulation of the recent past and future chemical climate states
based on current climate simulations,
2) to the identification and quantification of biogenic emissions to the atmosphere and their role in both air quality and the climate system, and
3) to the study of the crucial roles of the upper troposphere/lower stratosphere (UTLS) and the middle atmosphere (MA) in the physical and chemical climate system.
In order to address these priorities ACD scientists:
1) develop and update global chemical models that run within the CCSM framework and modify those
to simulate past and future chemical states (including IPCC and WMO Ozone Assessment scenarios),
2) organize and participate in laboratory and field studies of biogenic emissions in a variety of ecosystems,
3) develop, deploy, and maintain ground based and airborne instrumentation required to study biogenic emissions,
4) develop, deploy, and maintain airborne instrumentation required to understand photochemistry and aerosol formation/composition of the UTLS,
5) organize and participate in field campaigns using HIAPER and other high altitude aircraft to study the UTLS region,
6) develop and utilize spaceborne instruments to examine dynamics and chemistry in the UTLS and MA,
7) develop and utilize process, regional, and global scale models to examine UTLS/MA dynamics and chemistry as well as to examine biogenic emissions and their impact on air quality and the climate system.
Current and Future Direction
ACD scientists direct their research efforts at two grand challenges that confront society and where atmospheric chemical processes play a crucial role: Regional and Global Air Quality and Chemistry in the Climate System. These projects have been chosen for their societal relevance and scientific merit.