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Steven Beaupré

Associate Professor



- University of California - Irvine

Research Topics:

Marine Biogeochemistry, Chemical kinetics of natural organic matter, radiocarbon analyses

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  • Bio/Research


    Dr. Beaupré’s research constrains the ocean’s role in Earth’s climate system by examining the marine component of the global carbon cycle. Specifically, he investigates the provenance and reactivity of organic carbon in the sea by coupling radiocarbon (14C) dating with chemical analyses. His work has appeared in Nature Geoscience, Geophysical Research Letters, Nuclear Instruments and Methods in Physics Research, and Fusion: Journal of the American Scientific Glassblowers Society, and he has contributed several textbook chapters on carbon isotopes in the sea.

    Study areas include:

    • Biogeochemistry of marine dissolved and particulate organic matter (DOM, POM), dissolved inorganic carbon (DIC), sediments, and primary marine aerosol; terrestrial soils
    • Reaction analyses (photochemical, thermal, biological, acid/base mineralization) and rapid characterization of complex mixtures (DOM, POM, sediments) with coarse chemical-, isotopic-, and kinetic- spectra
    • Instrumental and methodological development; radiocarbon analyses

  • Publications


    Lu, X., & Beaupré, S. (2021). Evaluation of the moderate DI13C isotope enrichment method for measuring photochemical mineralization of marine dissolved organic carbon. Limnology and Oceanography: Methods.

    Walker, B. D., Beaupré, S. R., Griffin, S., Walker, J., Druffel, E., & Xu, X. (2020). A sealed‐tube method for offline δ13C analysis of CO2 via a Gas Bench II continuous flow isotope ratio mass spectrometer. Rapid Communications in Mass Spectrometry.

    Beaupré, S. R., Walker, B. D., & Druffel, E. R. (2020). The two-component model coincidence: Evaluating the validity of marine dissolved organic radiocarbon as a stable-conservative tracer at Station M. Deep Sea Research Part II: Topical Studies in Oceanography, 104737.

    Mahmoudi, N., Enke, T. N., Beaupré, S. R., Teske, A. P., Cordero, O. X., & Pearson, A. (2019). Illuminating microbial species‐specific effects on organic matter remineralization in marine sediments. Environmental microbiology.

    Beaupré, S. R., Kieber, D. J., Keene, W. C., Long, M. S., Maben, J. R., Lu, X., … & Chang, R. Y. W. (2019). Oceanic efflux of ancient marine dissolved organic carbon in primary marine aerosol. Science Advances.

    Frossard, A. A., Long, M. S., Keene, W. C., Duplessis, P., Kinsey, J. D., Maben, J. R., Beaupré, S.R., … & Lu, X. (2019). Marine Aerosol Production via Detrainment of Bubble Plumes Generated in Natural Seawater with a Forced‐Air Venturi. Journal of Geophysical Research: Atmospheres.

    Frossard, A. A., Gérard, V., Duplessis, P., Kinsey, J. D., Lu, X., Zhu, Y., … & Beaupré, S. R. (2019). Properties of Seawater Surfactants Associated with Primary Marine Aerosol Particles Produced by Bursting Bubbles at a Model Air–Sea Interface. Environmental science & technology.

    Lu, X., and S. R. Beaupré (2019), Optimized volume determinations and uncertainties for accurate and precise manometry, Radiocarbon, doi:10.1017/RDC.2019.43.

    Walker, B. D., S. R. Beaupré, S. Griffin, and E. R. M. Druffel (2019). UV photochemical oxidation and extraction of marine dissolved organic carbon at UC Irvine: status, surprises, and methodological recommendations. Radiocarbon, 1-15, doi: 10.1017/rdc.2019.9

    Beaupré, S.R. (2019) Radiocarbon-based insights into the biogeochemical cycles of marine dissolved and particulate organic carbon. Encyclopedia of Ocean Sciences, eds Cochran J.K., Bokuniewicz H., & Yager P. (Academic Press), 3rd Ed. DOI: 10.1016/B978-0-12-409548-9.09522-1

    Taylor GT, Suter EA, Li ZQ, Chow S, Stinton D, Zaliznyak T and Beaupré SR (2017) Single-Cell Growth Rates in Photoautotrophic Populations Measured by Stable Isotope Probing and Resonance Raman Microspectrometry. Front. Microbiol. 8:1449. doi: 10.3389/fmicb.2017.01449

    Mahmoudi, N., Beaupré, S. R., Steen, A. D., & Pearson, A. (2017). Sequential bioavailability of sedimentary organic matter to heterotrophic bacteria. Environmental Microbiology.

    Walker, B. D., Primeau, F. W., Beaupré, S. R., Guilderson, T. P., Druffel, E. R. M., & McCarthy, M. D. (2016). Linked changes in marine dissolved organic carbon molecular size and radiocarbon age. Geophysical Research Letters, 43(19).

    Beaupré, S. R., Mahmoudi, N., & Pearson, A. (2016). IsoCaRB: A novel bioreactor system to characterize the lability and natural carbon isotopic (14C, 13C) signatures of microbially respired organic matter. Limnology and Oceanography: Methods, 14(10), 668-681.

    Walker, B. D., Beaupré, S. R., Guilderson, T. P., McCarthy, M. D., & Druffel, E. R. M. (2016). Pacific carbon cycling constrained by organic matter size, age and composition relationships. Nature Geoscience.

    Druffel, E. R. M., Beaupré, S. R., & Ziolkowski, L. A. (2016). Radiocarbon in the Oceans. In Radiocarbon and Climate Change (pp. 139-166). Springer International Publishing.

    Trumbore, S. E., Xu, X., Santos, G. M., Czimczik, C. I., Beaupré, S. R., Pack, M. A., … & Ziolkowski, L. (2016). Preparation for radiocarbon analysis. In Radiocarbon and Climate Change (pp. 279-315). Springer International Publishing.

    Soulet, G., Skinner, L. C., Beaupré, S. R., & Galy, V. (2016). A Note on Reporting of Reservoir 14 C Disequilibria and Age Offsets. Radiocarbon, 58(1), 205-211.

    Beaupré S. R., Roberts M. L., Burton J. R. and Summons R. E. (2015) Rapid, high-resolution 14C chronology of ooids. Geochimica et Cosmochimica Acta 159, 126–138

    Beaupré, S. R. (2015). Chemical oceanography: The ocean’s pressure cooker. Nature Geoscience.

    Beaupré, S. R. (2014). Chapter 6: The isotopic composition of marine DOC, in Biogeochemistry of Marine Dissolved Organic Carbon, 2nd Edition, edited by D. A. Hansell and C. A. Carlson, pp. 335-368, Academic Press, U.K.
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