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About

A. D. Clarke is a leading atmospheric scientist whose research focuses on the optical properties, composition, and vertical distribution of aerosols, with a particular emphasis on how these particles influence climate. His most influential work, the 2010 paper on the Absorption Angstrom Exponent (AAE) in AERONET data, has garnered over 677 citations, establishing AAE as a critical indicator for distinguishing aerosol types such as black carbon, organic matter, and mineral dust. This contribution has become a cornerstone for remote sensing and climate modeling communities. Clarke also made significant advances in aerosol profiling, notably through his work with the NASA Langley Research Center’s High Spectral Resolution Lidar (HSRL) during the MILAGRO campaign, which provided validated, high-resolution vertical measurements of aerosol extinction and backscatter. Additionally, his research on sea spray aerosols has advanced understanding of their production mechanisms, size distributions, and optical properties—a key but often overlooked component of the global aerosol-climate problem. With a career marked by innovative lidar techniques and field studies, Clarke’s work continues to shape how scientists observe and interpret aerosol composition and its climatic impacts.