Tomoko Komada - Associate Professor
My research focuses on understanding the organic carbon cycle, with emphasis on the processes taking place at the land-ocean margin. I utilize natural abundance radiocarbon (14C), in conjunction with the stable isotope 13C, to investigate the sources, cycling, and fate of various organic carbon pools in the environment. Topics of interest include: sediment biogeochemistry and the significance of coastal benthic processes in organic matter dynamics, composition of organic matter suspended in rivers and its fate in the ocean, and the role of organic-mineral associations in organic matter degradation and preservation.
Benner I., Diner R.E, Lefebvre S.C., Li D., Komada T., Carpenter E.J., and Stillman J.H. (2013) Emiliania huxleyi increases calcification but not expression of calcification-related genes in long-term exposure to elevated temperature and pCO2. Philosophical Transactions of the Royal Society B. 368, doi:10.1098/rstb.2013.0049.
Burdige D. J., Komada T. (2013) Using ammonium pore water profiles to assess stoichiometry of deep remineralization processes in methanogenic continental margin sediments. Geochemistry Geophysics Geosystems 14, 1626-1643.
Komada T., Burdige D. J., Crispo S. M., Druffel E. R. M., Griffin S., and Johnson L. (2013) Dissolved organic carbon dynamics in anaerobic sediments of the Santa Monica Basin. Geochimica et Cosmochimica Acta in press.
Komada T., Polly, J. A., and Johnson L. (2012) Transformations of carbon in anoxic marine sediments: Implications from Δ14C and δ13C signatures. Limnology and Oceanography 57:567-581.
Johnson L. and Komada T. (2011) Determination of radiocarbon in marine sediment porewater dissolved organic carbon by thermal sulfate reduction. Limnology and Oceanography: Methods 9:485-498.
Burdige D. J. and Komada T. (2011) Anaerobic oxidation of methane and the stoichiometry of remineralization processes in continental margin sediments. Limnology and Oceanography 56:1781-1796.
Komada T., Anderson M. R., and Dorfmeier C. L. (2008) Carbonate removal from coastal sediments for the determination of organic carbon and its isotopic signatures, δ13C and Δ14C: comparison of fumigation and direct acidification by hydrochloric acid. Limnology and Oceanography Methods 6:254-262.
Komada T., Druffel E. R. M., and Hwang J. (2005) Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ14C and δ13C signatures of organic compound classes. Global Biogeochemical Cycles 19: GB2017, doi:10.1029/2004GB002347.
Komada T., Reimers C. E., Luther, G. W. III, and Burdige D. J. (2004) Factors affecting dissolved organic matter dynamics in suboxic to anoxic coastal sediments. Geochimica et Cosmochimica Acta 68: 4099-4111.
Komada T., Druffel E. R. M., and Trumbore S. E. (2004) Oceanic export of relict carbon by small mountainous rivers. Geophysical Research Letters 31: L07504, doi:10.1029/2004GL019512.
Komada T., Reimers C. E., and Boehme S. E. (1998) Dissolved inorganic carbon profiles and fluxes determined using pH and PCO2 microelectrodes. Limnology and Oceanography 43: 769-781.