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.
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
*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.
*Tanioka, T. and K. Matsumoto, Effects of incorporating age-specific traits of zooplankton into a marine ecosystem model, Ecological Modelling, 368, doi:10.1016/j.ecolmodel.2017.11.024, 2018.
Matsumoto, K., K. Tokos, and *C. Gregory, Ventilation and dissolved oxygen cycle in Lake Superior: Insights from a numerical model, Geochemistry, Geophysics, Geosystems, 16, doi:10.1002/2015GC005916, 2015.
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 pCO2, Global Biogeochemical Cycles, 16(3), 10.1029/2001GB001442, 2002.