Now showing items 915-934 of 5422

    • The continental drift convection cell 

      Whitehead, John A.; Behn, Mark D. (John Wiley & Sons, 2015-06-02)
      Continents on Earth periodically assemble to form supercontinents and then break up again into smaller continental blocks (the Wilson cycle). Previous highly developed numerical models incorporate fixed continents while ...
    • The continental margin is a key source of iron to the HNLC North Pacific Ocean 

      Lam, Phoebe J.; Bishop, James K. B. (American Geophysical Union, 2008-04-09)
      Here we show that labile particulate iron and manganese concentrations in the upper 500 m of the Western Subarctic Pacific, an iron-limited High Nutrient Low Chlorophyll (HNLC) region, have prominent subsurface maxima ...
    • Continental shelf baroclinic instability. Part I : relaxation from upwelling or downwelling 

      Brink, Kenneth H. (American Meteorological Society, 2015-12-09)
      There exists a good deal of indirect evidence, from several locations around the world, that there is a substantial eddy field over continental shelves. These eddies appear to have typical swirl velocities of a few centimeters ...
    • Continental shelf baroclinic instability. Part II : oscillating wind forcing 

      Brink, Kenneth H.; Seo, Hyodae (American Meteorological Society, 2015-12-09)
      Continental shelf baroclinic instability energized by fluctuating alongshore winds is treated using idealized primitive equation numerical model experiments. A spatially uniform alongshore wind, sinusoidal in time, alternately ...
    • A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed 

      Glenn, Scott M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1983-01)
      A simple model for the bottom boundary layer on the continental shelf is presented. The governing equations are developed for a stratified, turbulent Ekman layer in a combined wave and current flow over a moveable sediment ...
    • Continental-scale variation in otolith geochemistry of juvenile American shad (Alosa sapidissima) 

      Walther, Benjamin D.; Thorrold, Simon R. (NRC Research Press, 2008-11-26)
      We assembled a comprehensive atlas of geochemical signatures in juvenile American shad (Alosa sapidissima) to discriminate natal river origins on a large spatial scale and at a high spatial resolution. Otoliths and (or) ...
    • Continued deceleration of Whillans Ice Stream, West Antarctica 

      Joughin, Ian; Bindschadler, R. A.; King, Matt A.; Voigt, Donald E.; Alley, Richard B.; Anandakrishnan, S.; Horgan, H.; Peters, L.; Winberry, P.; Das, Sarah B.; Catania, Ginny (American Geophysical Union, 2005-11-17)
      Earlier observations indicated that Whillans Ice Stream slowed from 1973 to 1997. We collected new GPS observations of the ice stream's speed in 2003 and 2004. These data show that the ice stream is continuing to decelerate ...
    • Continuous measurements of dissolved Ne, Ar, Kr, and Xe ratios with a field-deployable gas equilibration mass spectrometer 

      Manning, Cara C.; Stanley, Rachel H. R.; Lott, Dempsey E. (2016-01-30)
      Noble gases dissolved in natural waters are useful tracers for quantifying physical processes. Here, we describe a field-deployable gas equilibration mass spectrometer (GEMS) that provides continuous, real-time measurements ...
    • Continuous monitoring of near-bottom mesoplankton communities in the East China Sea during a series of typhoons 

      Grossmann, Mary M.; Gallager, Scott M.; Mitarai, Satoshi (2014-12)
      Typhoons are a common feature of summer and autumn months in the East China Sea. These events often promote phytoplankton growth in surface waters as a result of upwelling and transport of nutrients, but their effects on ...
    • Continuous summer export of nitrogen-rich organic matter from the Greenland Ice Sheet inferred by ultrahigh resolution mass spectrometry 

      Lawson, Emily C.; Bhatia, Maya P.; Wadham, Jemma L.; Kujawinski, Elizabeth B. (2014-11)
      Runoff from glaciers and ice sheets has been acknowledged as a potential source of bioavailable dissolved organic matter (DOM) to downstream ecosystems. This source may become increasingly significant as glacial melt rates ...
    • Continuous, array-based estimates of Atlantic Ocean heat transport at 26.5°N 

      Johns, William E.; Baringer, Molly O.; Beal, L. M.; Cunningham, S. A.; Kanzow, Torsten; Bryden, Harry L.; Hirschi, J. J. M.; Marotzke, J.; Meinen, C. S.; Shaw, B.; Curry, Ruth G. (American Meteorological Society, 2011-05-15)
      Continuous estimates of the oceanic meridional heat transport in the Atlantic are derived from the Rapid Climate Change–Meridional Overturning Circulation (MOC) and Heatflux Array (RAPID–MOCHA) observing system deployed ...
    • A continuous-flow gas chromatography 14C accelerator mass spectrometry system 

      McIntyre, Cameron P.; Galutschek, Ernst; Roberts, Mark L.; von Reden, Karl F.; McNichol, Ann P.; Jenkins, William J. (Dept. of Geosciences, University of Arizona, 2010-08)
      Gas-accepting ion sources for radiocarbon accelerator mass spectrometry (AMS) have permitted the direct analysis of CO2 gas, eliminating the need to graphitize samples. As a result, a variety of analytical instruments can ...
    • Continuously stratified nonlinear low-mode internal tides 

      Helfrich, Karl R. (Sears Foundation for Marine Research, 2008-05)
      A model for hydrostatic, fully nonlinear, low-mode internal tides is extended to continuously stratified conditions. Periodic inertia-gravity solutions of permanent form are shown to exist only for a limited range of ...
    • Contrasting biogeochemical cycles of cobalt in the surface western Atlantic Ocean 

      Dulaquais, Gabriel; Boye, Marie; Middag, Rob; Owens, Stephanie A.; Puigcorbe, Viena; Buesseler, Ken O.; Masque, Pere; de Baar, Hein J. W.; Carton, Xavier (John Wiley & Sons, 2014-12-05)
      Dissolved cobalt (DCo; <0.2 µm; 14 to 93 pM) and the apparent particulate cobalt (PCo; >0.2 µm; <1 to 15 pM) were determined in the upper water column (<1000 m) of the western Atlantic Ocean along the GEOTRACES-A02 section ...
    • Contribution of ocean, fossil fuel, land biosphere, and biomass burning carbon fluxes to seasonal and interannual variability in atmospheric CO2 

      Nevison, Cynthia D.; Mahowald, Natalie M.; Doney, Scott C.; Lima, Ivan D.; van der Werf, Guido R.; Randerson, James T.; Baker, David F.; Kasibhatla, Prasad S.; McKinley, Galen A. (American Geophysical Union, 2008-02-12)
      Seasonal and interannual variability in atmospheric carbon dioxide (CO2) concentrations was simulated using fluxes from fossil fuel, ocean and terrestrial biogeochemical models, and a tracer transport model with time-varying ...
    • Contribution of Th-230 measurements to the estimation of the abyssal circulation 

      Marchal, Olivier; Francois, Roger; Scholten, Jan C. (2007-01-02)
      An inverse finite-difference model of the abyssal circulation in the North Atlantic Ocean is developed in order to evaluate the dynamical information contained in measurements of thorium-230 (230Th). The model has a very ...
    • The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation 

      Jullion, Loic; Naveira Garabato, Alberto C.; Bacon, Sheldon; Meredith, Michael P.; Brown, Pete J.; Torres-Valdes, Sinhue; Speer, Kevin G.; Holland, Paul R.; Dong, Jun; Bakker, Dorothee C. E.; Hoppema, Mario; Loose, Brice; Venables, Hugh J.; Jenkins, William J.; Messias, Marie-Jose; Fahrbach, Eberhard (John Wiley & Sons, 2014-06-05)
      The horizontal and vertical circulation of the Weddell Gyre is diagnosed using a box inverse model constructed with recent hydrographic sections and including mobile sea ice and eddy transports. The gyre is found to convey ...
    • Contributions of high- and low-quality patches to a metapopulation with stochastic disturbance 

      Strasser, Carly A.; Neubert, Michael G.; Caswell, Hal; Hunter, Christine M. (Springer, 2010-12-31)
      Studies of time-invariant matrix metapopulation models indicate that metapopulation growth rate is usually more sensitive to the vital rates of individuals in high-quality (i.e., good) patches than in low-quality (i.e., ...
    • Contributions of long-term research and time-series observations to marine ecology and biogeochemistry 

      Ducklow, Hugh W.; Doney, Scott C.; Steinberg, Deborah K. (2008-05-02)
      Time-series observations form a critical element of oceanography. New interdisciplinary efforts launched in the past two decades complement the few earlier, longer-running time series in building a better, though still ...
    • Contributions to automated realtime underwater navigation 

      Stanway, Michael J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-02)
      This dissertation presents three separate–but related–contributions to the art of underwater navigation. These methods may be used in postprocessing with a human in the loop, but the overarching goal is to enhance vehicle ...