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Nicolas Cassar

Lee Hill Snowdon Professor of Biogeochemistry
Earth and Climate Sciences
Box 90328, Durham, NC 27708
Grainger Hall, 9 Circuit Drive (GH5119), Nicholas School of the Environment, Durham, NC 27708

Overview


Nicolas Cassar's research focuses on environmental biogeochemistry and physiology, with the objective of constraining the mechanisms governing carbon cycling and climate. Current research interests include ocean carbon cycles and productivity; carbon acquisition mechanisms in marine phytoplankton and implications for climate change and paleo-CO2 reconstruction; and global carbon cycle and ocean-atmosphere fluxes. His scientific approach is interdisciplinary, integrating field observations, laboratory experiments, modeling and theory.

Current Appointments & Affiliations


Lee Hill Snowdon Professor of Biogeochemistry · 2025 - Present Earth and Climate Sciences, Nicholas School of the Environment
Professor of Biogeochemistry · 2019 - Present Earth and Climate Sciences, Nicholas School of the Environment

In the News


Published October 27, 2025
Discover New Innovations at Invented at Duke 2025
Published June 24, 2025
What the Ocean’s Changing Color Means
Published April 22, 2025
Ten Faculty Named 2025 Bass Chairs

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Recent Publications


Evidence of limited N2 fixation in the Southern Ocean

Journal Article Communications Earth and Environment · December 1, 2025 Biological nitrogen fixation is an important source of new nitrogen, influencing ocean fertility and carbon uptake. While recently documented in Arctic waters, its role in the Southern Ocean remains uncertain. We measured nitrogen fixation along the Wester ... Full text Cite
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Recent Grants


Nutrition as a BOOST for corals in the face of marine heat waves

ResearchPrincipal Investigator · Awarded by Institut de Recherche pour le Developpement · 2025 - 2027

Response of Nitrogen Fixation in Lichens and Mosses to a Rapidly Changing Arctic Environment

ResearchPrincipal Investigator · Awarded by Army Research Office · 2023 - 2027

Underwater coded aperture miniature mass spectrometer (UW-CAMMS)

ResearchCo-Principal Investigator · Awarded by National Science Foundation · 2021 - 2026

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Education, Training & Certifications


University of Hawaii, Manoa · 2003 Ph.D.
McGill University (Canada) · 1997 B.S.

External Links


Cassar Lab