معرفی
Daniel M. Sigman is the Dusenbury Professor of Geological and Geophysical Sciences at Princeton University's Department of Geosciences. His research focuses on geochemistry and paleoclimate, particularly the interaction between biogeochemical cycles and environmental changes over Earth's history. He leads the Sigman Research Laboratory, which develops and applies stable isotope methods to study the marine nitrogen cycle and paleoceanographic processes. His work addresses glacial-interglacial climate cycles, ocean deoxygenation, and the role of polar oceans in atmospheric CO₂ regulation.
Key affiliations include Princeton's Department of Geosciences and the Sigman Research Laboratory. He advises multiple graduate students and has contributed to groundbreaking studies on early hominin diets, ocean nutrient dynamics, and isotopic proxy development. His recent work includes analyzing tooth enamel isotopes to reconstruct Australopithecus diets and exploring the impacts of climate change on ocean oxygen levels.
Research highlights include discoveries about nitrogen fixation mechanisms, the timing of Bering Strait flooding, and the role of ocean stratification in glacial cycles. His lab integrates field studies, isotopic analyses, and geochemical modeling, with ongoing projects focused on paleoclimate reconstruction and biogeochemical feedbacks.
