Atmospheric composition; natural and anthropogenic sources of gases and aerosols; gas-phase and multiphase chemistry; photochemical oxidation and secondary aerosol formation; aerosol physical and chemical properties; aerosol size distributions; aerosol–radiation interactions, aerosol–cloud interactions; aerosol impacts on radiative forcing, climate, and air quality.
Biosphere–atmosphere–ocean interactions; energy, carbon, and water exchange; vegetation–climate feedback, land-use change, ocean–atmosphere exchange, global carbon cycle, and biomass burning; ground-based and satellite observations; atmospheric instrumentation; data analysis and uncertainty assessment; multi-platform data integration; Earth system modeling of atmospheric chemistry and aerosols; applications in climate analysis and prediction.