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About

Philip Stier is a leading figure in atmospheric science, whose research focuses on the critical intersection of aerosols, clouds, and climate. His work is central to understanding how tiny particles in the atmosphere influence the Earth's energy balance and climate system. A major contribution is his leadership in the AeroCom and AeroSat initiatives, where he has driven the systematic evaluation of global aerosol models against satellite observations. His highly cited studies, such as the 2016 paper on temporal collocation (95 citations) and the 2020 AeroCom–AeroSat intercomparison (82 citations), have established rigorous frameworks for model validation, revealing that mismatches in sampling time can introduce errors as large as model biases. Stier’s work on absorbing aerosol optical depth (AAOD) and single scattering albedo (SSA) has been pivotal in constraining the poorly understood role of black carbon and other absorbing particles in atmospheric heating. With a career spanning hundreds of papers and thousands of citations, his research is indispensable for improving climate projections and informing policy on air quality and climate change.