Department of Earth and Environmental Sciences
Newton Horace Winchell School of Earth and Environmental Sciences

Katsumi Matsumoto


385-12 Tate Hall


PhD, 2000, Columbia University

Ocean Biogeochemical Cycles Research Group


Research Interests

I am trained in oceanography and low temperature geochemistry. The general areas of my research are carbon cycle, climate change, and their interactions. Typically, I use physics-biogeochemistry coupled models of global ocean in order to probe carbon-climate feedbacks. The time period of interest spans the late Pleistocene glacial-interglacial, the modern, and the near future. Recently I have been interested in how the plasticity of phytoplankton's chemical makeup affects the global ocean carbon cycle and why dissolved organic carbon in the deep ocean is so old. A local research interest is Lake Superior. I aim to understand the formation and migration of Lake Superior's thermal bar using satellite imagery and numerical modeling.


Courses Taught

  • Oceanography
  • Earth Surface Dynamics
  • Introductory Geology Field Camp
  • Science and Politics of Global Warming
  • Biogeochemical Cycles in the Ocean
  • Graduate seminars


Selected Publications (*advisee)

  • Matsumoto, K., *T. Tanioka, and R. Rickaby, Linkages between dynamic phytoplankton C:N:P and ocean carbon cycle under climate change, Oceanography, 33(2), doi:10.5670/oceanog.2020.203, 2020.
  • *Tanioka, T., C. Fichot, and K. Matsumoto, Towards determining the spatio-temporal variability of upper-ocean ecosystem stoichiometry from satellite remote sensing, Frontiers in Marine Science, doi:10.3389/fmars.2020.604893, 2020.
  • *Tanioka, T. and K. Matsumoto, Stability of marine organic matter respiration stoichiometry, Geophysical Research Letter, 47, e2019GL085564, doi:10.1029/2019GL085564, 2020.
  • Matsumoto, K., K. S. Tokos, and *J. Rippke, Climate projection of Lake Superior under a future warming scenario, Journal of Limnology, doi:10.4081/jlimnol.2019.1902, 2019.
  • *McKinney, P.J., K. Tokos, and K. Matsumoto, Modeling nearshore-offshore exchange in Lake Superior, PLoS ONE 13(2), doi:10.1371/journal.pone.0193183, 2018.
  • Matsumoto, K. and Y. Yokoyama, Atmospheric Δ14C reduction in simulations of Atlantic overturning circulation shutdown, Global Biogeochemical Cycles, 27, 1-9, doi:10.1002/gbc.20035, 2013.
  • *White, B. and K. Matsumoto, Causal mechanisms of the deep chlorophyll maximum in Lake Superior: A numerical modeling investigation, J. Great Lakes Research, 38, 504-513, 2012.
  • Matsumoto, K., Biology-mediated temperature control on atmospheric pCO2 and ocean biogeochemistry, Geophysical Research Letters, 34, L20605, doi:10.1029/2007GL031301, 2007.
  • Matsumoto, K., Radiocarbon-based circulation age of the world oceans, J. Geophysical Research, 112, C09004, doi:10.1029/2007JC004095, 2007.
  • Contributing author to Jansen, E., J. Overpeck, and others, Paleoclimate, Chapter 6 inClimate Change 2007: The Physical Science Basis. Contribution of WG1 to the Fourth Assessment Report of the IPCC, edited by S. Solomon and others. Cambridge University Press, 2007.
  • Matsumoto, K. and N. Gruber, How accurate is the estimation of anthropogenic carbon in the ocean? An evaluation of the ΔC* method, Global Biogeochemical Cycles, 19, GB3014, doi:10.1029/2004GB002397, 2005.
  • Matsumoto, K. and 35 others, Evaluation of ocean carbon cycle models with data-based metrics, Geophysical Research Letters, 31, L07303, doi:10.1029/2003GL018970, 2004.
  • Matsumoto, K., J.L. Sarmiento, and M.A. Brzezinski, Silicic acid "leakage" from the Southern Ocean: A possible explanation for glacial atmospheric pCO2Global Biogeochemical Cycles, 16(3), 10.1029/2001GB001442, 2002. 


Recent Research Support

  • NSF: A power law model of dynamic marine phytoplankton stoichiometry
  • NSF: Collaborative research: Exploring hypotheses of southern hemisphere westerly wind changes on Southern Ocean circulation and
  • NASA: Seasonal evolution of the coastal thermal front and small eddies in the Great Lakes as characterized by satellite SST and SAR imagery and numerical modeling


Recent Honors and Awards

  • Leverhulme Trust Visiting Professor, University of Oxford, 2018-2019
  • Visiting Fellow, University of New South Wales, 2012
  • Visiting Scholar, University of Tasmania, 2012
  • Visiting Professor, University of Tokyo, 2011-2012
  • McKnight Land-Grant Professorship, University of Minnesota, 2008