David C. Kadko

Associate Director and Professor



David C. Kadko

David C. Kadko, Associate Director and Professor

My research interests lie in utilizing naturally occurring radioactivity for the purpose of tracing the pathways and discovering the rates of various oceanic processes. Because naturally occurring radioisotopes have half-lives ranging from seconds to many years, it is possible to study processes that encompass a great variety of temporal and spatial scales. This has also given me the opportunity to be involved in studies crossing over different disciplines of oceanography.

Research Projects


  • Kadko, D. (1980).  230Th, 226Ra, and 222Rn in abyssal sediments. Earth Planet. Sci. Lett.  49, 360-380.
  • Kadko, D.  (1980).  A detailed study of some uranium series nuclides at an abyssal hill area near the East Pacific Rise at 8o 47’N. Earth Planet. Sci. Lett.  51, 115-151.
  • Kadko, D. and L. H. Burckle. (1980). Manganese nodule growth rates determined by fossil diatom dating. Nature, 87,725-726.
  • Kadko, D.(1983). A multi-tracer approach to the study of erosion in the Northeast Equatorial Pacific. Earth Planet. Sci. Lett. 63,13-33.
  • Kadko, D., J. R. Blueford, L. H. Burckle, and J. Barron.  (1983). Selective dissolution of siliceous microfossils observed in a box core from the Northeast Equatorial Pacific.  Nature,302,139-141.
  • Kadko, D. and G. R. Heath. (1984). Models of depth dependent bioturbation at MANOP site H in the Eastern Equatorial Pacific. J. Geophys. Res. 89,6567-6570.
  • Kadko, D.(1985). Late Cenozoic sedimentation and metal deposition in the North Pacific.  Geochim. Cosmochim. Acta  49, 651-661.
  • Kadko, D., R. Koski, M. Tatsumoto, and R. Bouse. (1985/86).  An estimate of hydrothermal fluid residence times and vent chimney growth rates based on 210Pb/Pb ratios and mineralogic studies of sulfides dredged from the Juan de Fuca Ridge.  Earth Planet Sci. Lett. 76,35-44.
  • Gorda Ridge Research Team, Hydrothermal Activity on the Gorda Ridge (1985).  EOS 66, 523.
  • Kulm, L. D., E. Suess, J. C. Moore, B. Carson, B. T. Lewis, S. Ritger, D. Kadko, T. Thornburg, R. Embley, W. Rugh, G. J. Massoth, M. Langseth, G. R. Cochran, and R. L. Scamman.  (1986).  Oregon margin subduction zone:  Geologic framework, fluid venting, biological communities and carbonate lithification observed by deep submersible. Science, 231, 561-567.
  • Kadko, D. (1986). Radon-222 as a real time tracer of hydrothermal activity on the Gorda Ridge, Open File Report 0-86-14, State of Oregon, Department of Geology and Mineral Industries, 19 p.
  • Kadko, D., M. Bacon, and A. Hudson.  (1986/87).  Enhanced scavenging of 210Pb and 210Po by processes associated with the East Pacific Rise at 8o45’N. Earth Planet. Sci. Lett.  81, 349-357.
  • Kadko, D., J. K. Cochran, and M. Lyle.  (1987).  The effect of bioturbation and adsorption gradients on solid and dissolved radium profiles from the Eastern Equatorial Pacific.  Geochim. Cosmochim. Acta. 51, 1613-1623.iconPDF Kadko et al 1987
  • Baker, E., G. J. Massoth, R. W. Collier, J. H. Treffrey, D. Kadko, T. A. Nelson, P. A. Rona, and J. E. Lupton. (1987). Evidence for high temperature venting on the Gorda Ridge, Northeast Pacific Ocean. Deep-Sea Res. 34, 1461-1476.
  • Suess, E., M. Fisk and D. Kadko. (1987). Thermal interaction between back-arc volcanism and basin sediments in the Bransfield Strait, Antarctica.  Antarctic Journal of the United States. 22, No. 5, 47-49.
  • Kadko, D., and W. Moore. (1988). Radiochemical constraints on the crustal residence time of submarine hydrothermal fluids:  Endeavour Ridge.  Geochim. Cosmochim. Acta. 52, 659-668.  iconPDF Kadko-Moore
  • Rosenberg, N., J. E. Lupton, D. Kadko, R. Collier, M. D. Lilley and H. Pak. (1988). Estimation of heat and chemical fluxes from a seafloor hydrothermal vent field using radon measurements. Nature, 334, 604-607.
  • The Coastal Transition Zone Group.  (1988).  The Coastal Transition Zone Program. EOS. 69, 704-707.
  • Huh, C., W. Moore, and D. Kadko.  (1989).  Oceanic 232Th:  A reconnaissance and implications of global distribution from manganese nodules.  Geochim. Cosmochim. Acta. 53, 1357-1366.
  • Kadko, D., N. Rosenberg, J. E. Lupton, R. Collier, M. Lilley.  (1990). Chemical reaction rates and entrainment within the Endeavour Ridge hydrothermal plume.  Earth Planet. Sci. Lett. 99, 315-335.
  • Kadko, D., L. Washburn, and B. H. Jones. (1991). Evidence of subduction within cold filaments of the N. California Coastal Transition Zone.  Journ. Geophys. Res., 96, 14909-14926.
  • Washburn, L., D. C. Kadko, B. H. Jones. T. Hayward, P. M. Kosro, T. P. Stanton, A. Huyer, S. Ramp and T. Cowles.  (1991).  Water mass subduction and the transport of phytoplankton in a coastal upwelling system.  Journ. Geophys. Res., 96, 14927-14946.
  • Huh, C., and D. Kadko. (1992). Uranium series disequilibrium in deep sea sediments.  In: Uranium Series Disequilibrium.  Applications to Environmental Problems (2nd edition).  Oxford Science Pub.
  • Kadko, D. (1993). Excess 210Po and nutrient recycling within the California Coastal Transition Zone. Journ. Geophys. Res.,15, 857-864.
  • Kadko, D. An assessment of the effect of chemical scavenging within submarine hydrothermal plumes upon ocean geochemistry (1993). Earth Planet.Sci. Lett. 120, 361-374.
  • Kadko, D., R. A. Feely and G. J. Massoth (1994).  Scavenging of 234Th and PO4 removal from the hydrothermal effluent plume over the N. Cleft Segment of the Juan de Fuca Ridge.  J. Geophys. Res. 99, 5017-5024
  • Gendron, J. F., J. F. Todd, R. A. Feely, E. T. Baker and D.Kadko (1994). Excess 222Rn over the Cleft Segment, Juan de Fuca Ridge.  Journ. Geophys. Res. 99, 5007-5015.
  • Koski, R. A., I.R. Jonasson, D. Kadko, V.K Smith and F.L. Wong (1994). Compositions, growths mechanisms, temporal relations of hydrothermal sulfide-sulfate-silica chimneys at the northern Cleft segment, Juan de Fuca Ridge. J. Geophys. Res. 99, 4813-4832.
  • Kadko D., E. Baker, J. Alt, J. Baross (1994). RIDGE/VENTS Workshop Final Report on “Global Impact of Submarine Hydrothermal Processes”.  Ridge office publication.
  • Kadko, D., J. Baross, and J. Alt (1995) Hydrothermal fluxes and global change. In: Seafloor Hydrothermal Systems: Physical, chemical, biological and geological interactions within hydrothermal systems; AGU Mono. edited by Humphris S., L.Mullineaux, R.Zierenberg and R. Thomson, Am. Geophys. Un., Washington, D.C. 91, 446-466.
  • Kadko, D. and D. Olson (1996) Be-7 as a tracer of surface water subduction and mixed layer history. Deep Sea Res. 43, 89-116.
  • Kadko, D. (1996) Radioisotopic studies of hydrothermal vents. Rev. Geophys.34, 349-366.
  • Becker K., R. Von Herzen, J. Kirklin, R. Evans, D. Kadko, M. Kinoshita (1996) Conductive heat flow at the TAG hydrothermal mound: Results from 1993-1995 submersible surveys. Geophy. Res. Lett. 23, 3463-3466
  • Stephens M.P. and D.Kadko (1997) Glacial/Holocene calcium carbonate dissolution at that Central Equatorial Pacifc seafloor. Paleoocean. Paleoocean. 6, 797-804.
  • Stephens M.P., D.Kadko, C.R. Smith, and M. Latasa (1997) Chlorophyll-a and pheopigments as tracers of labile organic carbon at the Central Equatorial Pacific Seafloor. Geochim. Cosmochim. Acta. Geochim Cosmochim. Acta. 61, 4605-4619.
  • Kadko, D., J. Baross, E. Baker (1998) RIDGE/VENTS Workshop Final Report on “The Effect of Seafloor Hydrothermalism on Surface Ocean Productivity”.  Ridge office publication.
  • Kadko D. and D.A. Butterfield (1998) The relationship of hydrothermal fluid composition and crustal residence time to maturity of vent fields on the Juan de Fuca Ridge. Geochim. Cosmochim. Acta. 62, 1521-1533.
  • Mottl M.J., G. Wheat, E. Baker, N.Becker, E. Davis, R.Feely, A. Grehan, D.Kadko, M.Lilley, G. Massoth, C. Moyer, F. Sansone (1998) Warm springs discovered on 3.5 Ma oceanic crust, eastern flank of the Juan de Fuca Ridge, Geology 26, 51-54.
  • Perovich D.K., E.L. Andreas, J.A. Curry, H.Eiken, C.W.Fairall, T.C. Grenfell, P.S. Guest, J.Intrieri, D.Kadko et al. (1999) Year on ice gives climate insights. EOS 481,485-486.
  • Kadko D. (2000) Modeling the Evolution of the Arctic Mixed Layer during the Fall 1997 SHEBA Project using measurements of 7Be. Journ. Geophys. Res, 105, 3369-3378  iconPDF Kadko-SHEBA-2000
  • Tivey M.K., A.M. Bradley, T.M. Joyce and D. Kadko (2002) Insights into tide-related variabilty at seafloor hydrothermal vents from time-series temperature measurements.  Earth Planet. Sci. Lett. 202, 693-707.
  • Eicken H., R. Krouse, D. Kadko, D. Perovich (2002) Tracer studies of pathways and rates of meltwater transport through Arctic summer sea ice. Journ. Geophys. Res. 107, 10.1029/200JC000583.
  • Schuller D., Kadko D., and C. R. Smith.(2004) Use of 210Pb/226Ra disequilibria in the dating of deep-sea whale falls. Earth Planet Sci. Lett 218 (3-4), 277-289.
  • Kadko D. and P. Swart  (2004) The source of the high heat and freshwater content of the upper ocean at the SHEBA site in the Beaufort Sea in 1997. Journ. Geophys. Res. 109, C01022, doi:10.1029/2002JC001734.
  • Hansell D.A., Kadko, D., Bates, N.R. (2004). Degradation of Terrigenous Dissolved Organic Carbon in the Western Arctic Ocean. Science 304, 858-861.
  • Wheat C.G., M.J. Mottl, A.T. Fisher, D.Kadko, E.E. Davis and E. Baker.(2004) Heat Flow Through a Basaltic Outcrop on a Sedimented Young Ridge Flank . Geochem. Geophys. Geosys. 5, doi:10.1029/2004GC000700.
  • Kadko D. and R. Muench.(2005) Evaluation of shelf-basin interaction in the western Arctic by use of short-lived radium isotopes: The importance of mesoscale processes. Deep Sea. Res. 52, 3227-3244 iconPDF Kadko-Muench-2005
  • Mathis J.T., R.S. Pickart, Hansell D.A., Kadko D., and Bates N.R. (2007) Eddy transport of organic carbon and nutrients from the Chukchi Shelf: Impact on the upper halocline of the western Arctic Ocean. Journ. Geophy. Res., 112, C05011, doi:10.1029/2006JC003899.
  • Mathis, J.T., D.A. Hansell, D. Kadko, N.R. Bates, L.W. Cooper (2007). Determining net dissolved organic carbon production in the hydrographically complex western Arctic Ocean. Limnology and Oceanography. Limnology and Oceanography 52: 1789-1799.
  • Kadko D., Gronvold K., and D. Butterfield (2007) Application of Radium Isotopes to Determine Crustal Residence Times of Hydrothermal Fluids from two Sites on the Reykjanes Peninsula, Iceland. Geochimica et Cosmochimica Acta 71, 6019—6029.  iconPDF Kadko-Gronvold-Butterfield
  • Kadko, D., R. S. Pickart, and J. Mathis (2008), Age characteristics of a shelf-break eddy in the western Arctic and implications for shelf-basin exchange, J. Geophys. Res., 113, C02018, doi:10.1029/2007JC004429. iconPDF kadko-2008
  • Cochran J.K. and Kadko D., (2008) Uranium And Thorium Series Radionuclides in Marine Groundwaters. in “U-Th Series Nuclides in Aquatic Systems” Series: Radioactivity in the Environment. S. Krishnaswami and J.K. Cochran eds. Elsevier.
  • Kadko D., and K. Aagaard (2009) Glimpses of Arctic Ocean shelf-basin interaction from submarine-borne radium sampling. Deep Sea Res. I, 56, 32-40.  iconPDF kadko-aagaard2009
  • Kadko, D. (2009) Rapid oxygen utilization in the ocean twilight zone assessed with the cosmogenic isotope 7Be, Global Biogeochem. Cycles, 23, GB4010, doi:10.1029/2009GB003510.  iconPDF kadko
  • Burd, Adrian B., Dennis A. Hansell, Deborah K. Steinberg, Thomas R. Anderson, Javier Arístegui, Federico Baltar, Steven R. Beaupré, Ken O. Buesseler, Frank DeHairs, George A. Jackson, David C. Kadko, Rolf Koppelmann, Richard S. Lampitt, Toshi Nagata, Thomas Reinthaler, Carol Robinson, Bruce H. Robison, Christian Tamburini and Tsuneo Tanaka (2010). Assessing the apparent imbalance between geochemical and biochemical indicators of meso- and bathypelagic biological activity: What the @$#! is wrong with present calculations of carbon budgets? Deep-Sea Research II , 57(16): 1429-1592.
  • Kadko D. (2010) Understanding Trace Element and Isotope Cycling in the Arctic Ocean. Meeting Report, Eos, Transactions, American Geophysical Union,Vol. 91, No. 48.
  • Letscher, R.T., D.A. Hansell, and D.Kadko (2011). Removal of terrigenous dissolved organic carbon in the eastern Arctic Ocean Mar. Chem. 123, 78–87.
  • Kadko, D., and J. Prospero (2011), Deposition of 7Be to Bermuda and the regional ocean: Environmental factors affecting estimates of atmospheric flux to the ocean, J. Geophys. Res., 116, C02013, doi:10.1029/2010JC006629. iconPDF Kadko-Prospero2010JC006629
  • Kadko, D., and W. Johns (2011) Inferring upwelling rates in the equatorial Atlantic using 7Be measurements in the upper ocean. Deep-Sea Res. I,doi:10.1016/j.dsr.2011.03.004 iconPDF Kadko and Johns(2011)
  • Venti, A., D. Kadko, A. J. Andersson, C. Langdon, N. R. Bates (2012) A multi tracer model approach to estimate reef water residence times. Limnol. Ocean. Methods, 10:1078-1095
  • Letscher, R.T., D.A. Hansell, D. Kadko, N.R. Bates, (2013) Dissolved organic nitrogen dynamics in the Arctic Ocean, Marine Chemistry, 148, 1–9
  • Erhard, A.M.,  C.E. Reimers, D. Kadko, A. Paytan (2014) Records of trace metals in sediments from the Oregon shelf and slope: Investigating the occurrence of hypoxia in the past hundreds to thousands of years. Chemical Geology. 382, 32-43.
  • Haskell W.Z., D. Kadko, D.E. Hammond, M.G. Prokopenko, W.M. Berelson, A.N. Knapp and D. Capone (2015) Upwelling velocities and eddy diffusivity from 7Be measurements used to compare vertical nutrient fluxes to export POC flux in the Eastern Tropical South Pacific. Marine Chemistry. doi:10.1016/j.marchem.2014.10.004. 168, 140–150 iconPDF Kadko and Haskell (2015)
  • Kadko D., W. M. Landing, and R. U. Shelley (2015) A novel tracer technique to quantify the atmospheric flux of trace elements to remote ocean regions. Journ. Geophy. Res. Oceans, 119, doi:10.1002/2014JC010314. iconPDF Kadko et al 10.1002_2014JC010314
  • Muehllehner N., C. Langdon, A. Venti, D. Kadko (2016) Seasonal Dissolution and Carbonate Chemistry of the Florida Reef Tract. Biogeochem Cycles, 30, doi: 10.1002/2015GB005327
  • Kadko D., B. Galfond, W. M. Landing, and R. U. Shelley(2016) Determining the Pathways, Fate, and Flux of Atmospherically Derived Trace Elements in the Arctic Ocean/Ice System. Marine Chemistry, 182, 38-50, doi:10.1016/j.marchem.2016.04.006.
  • Anderson, R. F., H. Cheng, R. L. Edwards, M. Q. Fleisher, C. T. Hayes, K.-F. Huang, D. Kadko, P. J. Lam, W. M. Landing, Y. Lao, Y. Lu, C. I. Measures, P. L. Morton, S. B. Moran, D. C. Ohnemus, L. F. Robinson, R. U. Shelley (alphabetical order) (2016), How well can we quantify dust deposition to the ocean? Philosophical Transactions of the Royal Society A 374, DOI: 10.1098/rsta.2015.0285.
  • Baker, A.R., W.M. Landing, E. Bucciarelli, M. Cheize, S. Fietz, C.T. Hayes, D. Kadko, P.L. Morton, N. Rogan, G. Sarthou, R.U. Shelley, Z. Shi, A. Shiller, M.M.P. van Hulten (alphabetical order, after first 2 authors) (2016) Trace Element and Isotope Exchange at the Air – Sea Interface: Progress and Research Needs. Phil. Trans. R. Soc. A. DOI: 10.1098/rsta.2016.0190.
  • Kadko, D. (2017) Upwelling and Primary Production during the U.S. GEOTRACES East Pacific Zonal Transect. Global Biogeochem. Cycles. 31, doi:10.1002/2016GB005554. iconPDF gbc20507final

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