Atmospheric Composition & Chemical Processes

The Atmospheric Composition & Chemical Processes (ACCP) research program targets atmospheric constituents and chemical processes affecting air quality, the ozone layer, and climate. Researchers conceive, construct, develop, and deploy instruments to measure atmospheric trace gases and aerosols, and interpret observations to better understand atmospheric processes. ACCP conducts much of its research via airborne campaigns including research aircraft, weather balloons, and unmanned aerial vehicles (UAVS), but includes ground and ship-based measurements within its portfolio.

link to Article — **Research Highlight**: While human-caused carbon dioxide emissions are by far the most important driver of climate change, water vapor is actually the most abundant greenhouse gas, and is responsible for about half of Earth's natural greenhouse effect - the one that keeps our planet habitable. *Learn More* Photo: Max Dollner, University of Vienna