I'm a scientist interested in Earth's climate system as a whole. Most of my work is focussed on the oceans, their physics, biology, chemistry and variability on decadal to millennial time scales. I try to understand the causes for today's global deep overturning circulation, how and why it has changed in the past, how it may change in the future due to natural or human influences, how it impacts climate, ecosystems and biogeochemical cycles including isotopes. Click on the PROJECTS link above to find out more about current projects. I develop, improve, analyze, and use numerical (computer) models. The code I develop is available and free for everybody do download and use. Click on the MODELS link above or contact me if you're interested. Here is an interview about my life and career as part of OSU's Voices of a Warming Planet project.


I'm looking for a graduate student interested in working on modeling the ocean carbon cycle. If you have a good physical sciences and math background, if you're interested in numerical modeling and the ocean's carbon cycle this is the project for you. Contact me for questions and/or apply to our graduate program in Ocean, Earth, and Atmospheric Sciences.

Just Published

  • Davis, C. V., J. F. Ontiveros-Cuadras, C. Benitez-Nelson, A. Schmittner, E. J. Tappa, E. Osborne, and R. C. Thunell (2019)
    Ongoing increase in Eastern Tropical North Pacific denitrification as interpreted through the Santa Barbara Basin sedimentary δ15N record
    Paleoceanography and Paleoclimatology, PALO20782, doi: 10.1029/2019PA003578.
  • Wilmes, S.-B., A. Schmittner, and J. A. M. Green (2019)
    Glacial ice sheet extent effects on modeled tidal mixing and the global overturning circulation
    Paleoceanography and Paleoclimatology, doi: 10.1029/2019PA003644.
  • Lacerra M., D. C. Lund, G. Gebbie, D. W. Oppo, J. Yu, A. Schmittner and N. Umling (2019)
    Less remineralized carbon in the intermediate depth South Atlantic during Heinrich Stadial 1
    Paleoceanography and Paleoclimatology, doi: 10.1029/2018PA003537.
  • Gottschalk, J., G. Battaglia, H. Fischer, T. L. Fröhlicher, S. L. Jaccard, A. Jeltsch-Thömmes, F. Joos, P. Köhler, K. J. Meissner, L. Menviel, C. Nehrbass-Ahles, J. Schmitt, A. Schmittner, L. C. Skinner and T. F. Stocker (2019)
    Mechanisms of millennial-scale atmospheric CO2 change in numerical model simulations
    Quat. Sci. Rev., 220, 30-74, doi: 10.1016/j.quascirev.2019.05.013.
  • Khatiwala, S., A. Schmittner and J. Muglia (2019)
    Air-sea disequilibrium enhances ocean carbon storage during glacial periods
    Science Advances, 5(6), doi: 10.1126/sciadv.aaw4981
  • Muschitiello, F., W. J. D’Andrea, A. Schmittner, T. J. Heaton, M. L. Balascio, N. deRoberts, M. W. Caffee, T. E. Woodruff, K. C. Welten, L. C. Skinner, M. H. Simon and T. M. Dokken (2019)
    Deep-water circulation changes lead North Atlantic climate during deglaciation
    Nature Communications, 10(1), 1272, doi: 10.1038/s41467-019-09237-3.