Now showing items 1-9 of 9

    • Carbon export and transfer to depth across the Southern Ocean Great Calcite Belt 

      Rosengard, Sarah Z.; Lam, Phoebe J.; Balch, William M.; Auro, Maureen E.; Pike, Steven M.; Drapeau, David T.; Bowler, Bruce C. (Copernicus Publications on behalf of the European Geosciences Union, 2015-07-02)
      Sequestration of carbon by the marine biological pump depends on the processes that alter, remineralize, and preserve particulate organic carbon (POC) during transit to the deep ocean. Here, we present data collected from ...
    • Cesium-134 and 137 activities in the central North Pacific Ocean after the Fukushima Dai-ichi Nuclear Power Plant accident 

      Kamenik, J.; Dulaiova, Henrieta; Buesseler, Ken O.; Pike, Steven M.; Stastna, K. (Copernicus Publications on behalf of the European Geosciences Union, 2013-09-23)
      Surface seawater 134Cs and 137Cs samples were collected in the central and western North Pacific Ocean during the 2 yr after the Fukushima Dai-ichi Nuclear Power Plant accident to monitor dispersion patterns of these ...
    • Fukushima-derived radionuclides in the ocean and biota off Japan 

      Buesseler, Ken O.; Jayne, Steven R.; Fisher, Nicholas S.; Rypina, Irina I.; Baumann, Hannes; Baumann, Zofia; Breier, Crystaline F.; Douglass, Elizabeth M.; George, Jennifer; Macdonald, Alison M.; Miyamoto, Hiroomi; Nishikawa, Jun; Pike, Steven M.; Yoshida, Sachiko (National Academy of Sciences, 2012-04-02)
    • Intercalibration studies of short-lived thorium-234 in the water column and marine particles 

      Maiti, Kanchan; Buesseler, Ken O.; Pike, Steven M.; Benitez-Nelson, Claudia R.; Cai, Pinghe; Chen, Weifang; Cochran, Kirk; Dai, Minhan; Dehairs, Frank; Gasser, Beat; Kelly, Roger P.; Masque, Pere; Miller, Lisa A.; Miquel, Juan Carlos; Moran, S. Bradley; Morris, Paul J.; Peine, Florian; Planchon, Frederic; Renfro, Alisha A.; Rutgers van der Loeff, Michiel M.; Santschi, Peter H.; Turnewitsch, Robert; Waples, James T.; Xu, Chen (Association for the Sciences of Limnology and Oceanography, 2012-09)
      Intercomparision of 234Th measurements in both water and particulate samples was carried out between 15 laboratories worldwide, as a part of GEOTRACES inter-calibration program. Particulate samples from four different ...
    • Particle export during the Southern Ocean Iron Experiment (SOFeX) 

      Buesseler, Ken O.; Andrews, J. E.; Pike, Steven M.; Charette, Matthew A.; Goldson, Laura E.; Brzezinski, Mark A.; Lance, V. P. (2004-07-26)
      We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4 week Fe enrichment experiment conducted in the high-silicate high-nitrate ...
    • Particle fluxes associated with mesoscale eddies in the Sargasso Sea 

      Buesseler, Ken O.; Lamborg, Carl H.; Cai, Pinghe; Escoube, Raphaelle; Johnson, Rodney J.; Pike, Steven M.; Masque, Pere; McGillicuddy, Dennis J.; Verdeny, Elisabet (2007-09-25)
      We examined the impact of a cyclonic eddy and mode-water eddy on particle flux in the Sargasso Sea. The primary method used to quantify flux was based upon measurements of the natural radionuclide, 234Th, and these flux ...
    • Plutonium in groundwater at the 100K-Area of the U.S. DOE Hanford Site 

      Dai, Minhan; Buesseler, Ken O.; Pike, Steven M. (2004-01-27)
      We examined the concentration, size distribution, redox state and isotopic composition of plutonium (Pu) in groundwater at the 100K-Area at the US Department of Energy’s (DOE) Hanford Site. Total concentrations of Pu ...
    • Radium-based estimates of cesium isotope transport and total direct ocean discharges from the Fukushima Nuclear Power Plant accident 

      Charette, Matthew A.; Breier, Crystaline F.; Henderson, Paul B.; Pike, Steven M.; Rypina, Irina I.; Jayne, Steven R.; Buesseler, Ken O. (Copernicus Publications on behalf of the European Geosciences Union, 2013-03-28)
      Radium has four naturally occurring isotopes that have proven useful in constraining water mass source, age, and mixing rates in the coastal and open ocean. In this study, we used radium isotopes to determine the fate and ...
    • Thorium-234 as a tracer of spatial, temporal and vertical variability in particle flux in the North Pacific 

      Buesseler, Ken O.; Pike, Steven M.; Maiti, Kanchan; Lamborg, Carl H.; Siegel, David A.; Trull, Thomas W. (2009-03-27)
      An extensive 234Th data set was collected at two sites in the North Pacific: ALOHA, an oligotrophic site near Hawaii, and K2, a mesotrophic HNLC site in the NW Pacific as part of the VERTIGO (VERtical Transport in the ...