Now showing items 1-20 of 803

  • The 129-iodine content of subtropical Pacific waters : impact of Fukushima and other anthropogenic 129-iodine sources 

    Guilderson, Thomas P.; Tumey, S. J.; Brown, T. A.; Buesseler, Ken O. (Copernicus Publications on behalf of the European Geosciences Union, 2014-09-11)
    Results obtained from a dedicated radiochemistry cruise approximately 100 days after the 11 March 2011 Tohoku earthquake and subsequent disaster at the Fukushima Daiichi Nuclear Power Plant show that Fukushima derived ...
  • 14C and 13C characteristics of higher plant biomarkers in Washington margin surface sediments 

    Feng, Xiaojuan; Benitez-Nelson, Bryan C.; Montlucon, Daniel B.; Prahl, Fredrick G.; McNichol, Ann P.; Xu, Li; Repeta, Daniel J.; Eglinton, Timothy I. (2012-11-22)
    Plant wax lipids and lignin phenols are the two most common classes of molecular markers that are used to trace vascular plant-derived OM in the marine environment. However, their 13C and 14C compositions have not been ...
  • 217 000-year-old DNA sequences of green sulfur bacteria in Mediterranean sapropels and their implications for the reconstruction of the paleoenvironment 

    Coolen, Marco J. L.; Overmann, Jorg (2006-08-08)
    Deep-sea sediments of the eastern Mediterranean harbor a series of dark, organic carbon-rich layers, so-called sapropels. Within these layers, the carotenoid isorenieratene was detected. Since it is specific for the ...
  • 238U-Th-230-Ra-226-Pb-210-Po-210, Th-232-Ra-228, and U-235-Pa-231 constraints on the ages and petrogenesis of Vailulu'u and Malumalu Lavas, Samoa 

    Sims, Kenneth W. W.; Hart, Stanley R.; Reagan, Mark K.; Blusztajn, Jerzy S.; Staudigel, Hubert; Sohn, Robert A.; Layne, Graham D.; Ball, Lary A.; Andrews, J. E. (American Geophysical Union, 2008-04-01)
    We report 238U-230Th-226Ra-210Pb-210Po, 232Th-228Ra and 235U-231Pa measurements for a suite of 14 geologically and geochemically well-characterized basaltic samples from the Samoan volcanoes Vailulu'u, Malumalu, and Savai'i. ...
  • Abundance and diversity of archaeal ammonia oxidizers in a coastal groundwater system 

    Rogers, Daniel R.; Casciotti, Karen L. (2010-10-12)
    Nitrification, the microbially-catalyzed oxidation of ammonia to nitrate, is a key process in the nitrogen cycle. Archaea have been implicated in the first part of the nitrification pathway (oxidation of ammonia to ...
  • Addressing ocean acidification as part of sustainable ocean development 

    Cooley, Sarah R.; Mathis, Jeremy T. (2012-10-09)
    Many of the declarations and outcome documents from prior United Nations international meetings address ocean issues such as fishing, pollution, and climate change, but they do not address ocean acidification. This ...
  • Adsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawater 

    Hartman, M. C.; Buesseler, Ken O. (Woods Hole Oceanographic Institution, 1994-07)
    Two polypropylene cartridge types (Beta Pure and Hytrex II) were tested in the laboratory as adsorbers for in-situ collection of dissolved Thorium-234 (234TH) in seawater. Using a uranyl nitrate tracer, we determined that ...
  • Advances in measurements of particle cycling and fluxes in the ocean 

    Owens, Stephanie A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)
    The sinking flux of particles is an important removal mechanism of carbon from the surface ocean as part of the biological pump and can play a role in cycling of other chemical species. This work dealt with improving ...
  • Aging of marine organic matter during cross-shelf lateral transport in the Benguela upwelling system revealed by compound-specific radiocarbon dating 

    Mollenhauer, Gesine; Inthorn, Maik; Vogt, Thomas; Zabel, Matthias; Sinninghe Damste, Jaap S.; Eglinton, Timothy I. (American Geophysical Union, 2007-09-18)
    Organic matter accumulation and burial on the Namibian shelf and upper slope are spatially heterogeneous and strongly controlled by lateral transport in subsurface nepheloid layers. Much of the material deposited in ...
  • Air-sea CO2 flux in the Pacific Ocean for the period 1990–2009 

    Ishii, Masao; Feely, Richard A.; Rodgers, Keith B.; Park, Geun-Ha; Wanninkhof, Rik; Sasano, D.; Sugimoto, H.; Cosca, C. E.; Nakaoka, S.; Telszewski, Maciej; Nojiri, Yukihiro; Mikaloff Fletcher, Sara E.; Niwa, Y.; Patra, Prabir K.; Valsala, V.; Nakano, H.; Lima, Ivan D.; Doney, Scott C.; Buitenhuis, Erik T.; Aumont, Olivier; Dunne, John P.; Lenton, A.; Takahashi, Taro (Copernicus Publications on behalf of the European Geosciences Union, 2014-02-06)
    Air–sea CO2 fluxes over the Pacific Ocean are known to be characterized by coherent large-scale structures that reflect not only ocean subduction and upwelling patterns, but also the combined effects of wind-driven gas ...
  • Air-sea gas transfer : its dependence on wind stress, small-scale roughness, and surface films 

    Frew, Nelson M.; Bock, Erik J.; Schimpf, Uwe; Hara, Tetsu; Haußecker, Horst; Edson, James B.; McGillis, Wade R.; Nelson, Robert K.; McKenna, Sean P.; Uz, B. Mete; Jahne, B. (American Geophysical Union, 2004-08-21)
    The influence of wind stress, small-scale waves, and surface films on air-sea gas exchange at low to moderate wind speeds (<10 m s−1) is examined. Coincident observations of wind stress, heat transfer velocity, surface ...
  • Air-sea gas transfer velocity estimates from the Jason-1 and TOPEX altimeters : prospects for a long-term global time series 

    Glover, David M.; Frew, Nelson M.; McCue, Scott J. (2006-03-02)
    Estimation of global and regional air–sea fluxes of climatically important gases is a key goal of current climate research programs. Gas transfer velocities needed to compute these fluxes can be estimated by combining ...
  • Alkenone distribution in Lake Van sediment over the last 270 ka : influence of temperature and haptophyte species composition 

    Randlett, Marie-Eve; Coolen, Marco J. L.; Stockhecke, Mona; Pickarski, Nadine; Litt, Thomas; Balkema, Cherel; Kwiecien, Ola; Tomonaga, Yama; Wehrli, Bernhard; Schubert, Carsten J. (Elsevier, 2014-07-29)
    Fossil long-chain alkenones have been used for several decades to reconstruct past ocean surface water temperatures and gained recent interest as a paleotemperature proxy for continental lake settings. However, factors ...
  • Analysis of unresolved complex mixtures of hydrocarbons extracted from Late Archean sediments by comprehensive two-dimensional gas chromatography (GC×GC) 

    Ventura, Gregory T.; Kenig, Fabien; Reddy, Christopher M.; Frysinger, Glenn S.; Nelson, Robert K.; Van Mooy, Benjamin A. S.; Gaines, Richard B. (2008-03)
    Hydrocarbon mixtures too complex to resolve by traditional capillary gas chromatrography display gas chromatograms with dramatically rising baselines or “humps” of coeluting compounds that are termed unresolved complex ...
  • Ancient DNA derived from alkenone-biosynthesizing haptophytes and other algae in Holocene sediments from the Black Sea 

    Coolen, Marco J. L.; Boere, Arjan C.; Abbas, Ben; Baas, Marianne; Wakeham, Stuart G.; Sinninghe Damste, Jaap S. (American Geophysical Union, 2006-02-18)
    Holocene sea surface temperatures (SST) of the Black Sea have been reconstructed using sedimentary C37 unsaturated alkenones assumed to be derived from the coccolithophorid haptophyte Emiliania huxleyi, whose fossil ...
  • Ancient DNA techniques : applications for deep-water corals 

    Waller, Rhian G.; Adkins, Jess F.; Robinson, Laura F.; Shank, Timothy M. (University of Miami - Rosenstiel School of Marine and Atmospheric Science, 2007-11-01)
    The potential applications of ancient DNA (aDNA) techniques have been realized relatively recently, and have been revolutionized by the advent of pCR techniques in the mid 1980s. Although these techniques have been proven ...
  • And on top of all that… coping with ocean acidification in the midst of many stressors 

    Breitburg, Denise L.; Salisbury, Joseph E.; Bernhard, Joan M.; Cai, Wei-Jun; Dupont, Sam; Doney, Scott C.; Kroeker, Kristy J.; Levin, Lisa A.; Long, W. Christopher; Milke, Lisa M.; Miller, Seth H.; Phelan, Beth; Passow, Uta; Seibel, Brad A.; Todgham, Anne E.; Tarrant, Ann M. (The Oceanography Society, 2015-06)
    Oceanic and coastal waters are acidifying due to processes dominated in the open ocean by increasing atmospheric CO2 and dominated in estuaries and some coastal waters by nutrient-fueled respiration. The patterns and ...
  • Animating the carbon cycle 

    Schmitz, Oswald J.; Raymond, Peter A.; Estes, James A.; Kurz, Werner A.; Holtgrieve, Gordon W.; Ritchie, Mark E.; Schindler, Daniel E.; Spivak, Amanda C.; Wilson, Rod W.; Bradford, Mark A.; Christensen, Villy; Deegan, Linda A.; Smetacek, Victor; Vanni, Michael J.; Wilmers, Christopher C. (2013-08)
    Understanding the biogeochemical processes regulating carbon cycling is central to mitigating atmospheric CO2 emissions. The role of living organisms has been accounted for, but the focus has traditionally been on ...
  • Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom 

    Behrenfeld, Michael J.; Doney, Scott C.; Lima, Ivan D.; Boss, Emmanuel S.; Siegel, David A. (John Wiley & Sons, 2013-06-20)
    Satellite measurements allow global assessments of phytoplankton concentrations and, from observed temporal changes in biomass, direct access to net biomass accumulation rates (r). For the subarctic Atlantic basin, analysis ...
  • Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms 

    Orr, James C.; Fabry, Victoria J.; Aumont, Olivier; Bopp, Laurent; Doney, Scott C.; Feely, Richard A.; Gnanadesikan, Anand; Gruber, Nicolas; Ishida, Akio; Joos, Fortunat; Key, Robert M.; Lindsay, Keith; Maier-Reimer, Ernst; Matear, Richard J.; Monfray, Patrick; Mouchet, Anne; Najjar, Raymond G.; Plattner, Gian-Kasper; Rodgers, Keith B.; Sabine, Christopher L.; Sarmiento, Jorge L.; Schlitzer, Reiner; Slater, Richard D.; Totterdell, Ian J.; Weirig, Marie-France; Yamanaka, Yasuhiro; Yool, Andrew (2005-07-29)
    The surface ocean is everywhere saturated with respect to calcium carbonate (CaCO3). Yet increasing atmospheric CO2 reduces ocean pH and carbonate ion concentrations [CO32−] and thus the level of saturation. Reduced ...