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Welcome to the Ocean Biogeochemistry Group

We carry out research on wide-ranging topics related broadly to the global ocean carbon cycle and how it is coupled to the global climate system. Our research tools are primarily numerical models of the global ocean and earth system and secondarily data analysis and remote sensing. The ocean carbon cycle is critical for global climate, because the oceans have an outsized influence on atmospheric CO2, which in turn is key to global climate change. We aim to quantitatively understand important drivers of global ocean carbon cycle under the climate conditions of the present, future, and the last ice age. When the oceans drive changes in atmospheric CO2 and climate, they in turn drive changes in the oceans. Understanding this dynamic ocean-climate coupling using numerical models is a major theme of the Ocean Biogeochemistry Group at the University of Minnesota.

You can read a Futurum article about the group written for a general audience.

Selected work (*student, postdoc 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. and K. Matsumoto, Stability of marine organic matter respiration stoichiometry, Geophysical Research Letter, 47, e2019GL085564, doi:10.1029/2019GL085564, 2020.

  • Matsumoto, K., Radiocarbon-based circulation age of the world oceans, J. Geophysical Research, 112, C09004, doi:10.1029/2007JC004095, 2007.

  • Matsumoto, K., Biology-mediated temperature control on atmospheric pCO2 and ocean biogeochemistry, Geophysical Research Letters, 34, L20605, doi:10.1029/2007GL031301, 2007.

  • Matsumoto, K., and 36 coauthors, Evaluation of ocean carbon cycle models with data-based metrics, Geophysical ResearchLetters, 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.

  • Broecker, W.S., K. Matsumoto, E. Clark, I. Hajdas, and G. Bonani, Radiocarbon age differences between coexisting foraminiferal species, Paleoceanography, 14, 431-436, 1999.