Now showing items 243-262 of 854

  • Do Trichodesmium spp. populations in the North Atlantic export most of the nitrogen they fix? 

    McGillicuddy, Dennis J. (John Wiley & Sons, 2014-02-20)
    A new observational synthesis of diazotrophic biomass and nitrogen fixation provides the opportunity for systematic quantitative evaluation of these aspects in biogeochemical models. One such model of the Atlantic Ocean ...
  • Dominant run-length method for image classification 

    Tang, Xiaoou (Woods Hole Oceanographic Institution, 1997-06)
    In this paper, we develop a new run-length texture feature extraction algorithm that significantly improves image classification accuracy over traditional techniques. By directly using part or all of the run-length matrix ...
  • Drag coefficients of vibrating synthetic rope 

    Charnews, Daniel Paul (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1971-09)
    The drag, amplitude, frequency tension, diameter and length of synthetic ropes vibrating because of vortex-induced forces, and net vibrating at different tensions were measured. Photographs were taken of the vortices. Drag ...
  • Drift and mixing under the ocean surface : a coherent one-dimensional description with application to unstratified conditions 

    Rascle, Nicolas; Ardhuin, Fabrice; Terray, Eugene A. (American Geophysical Union, 2006-03-24)
    Waves have many effects on near-surface dynamics: Breaking waves enhance mixing, waves are associated with a Lagrangian mean drift (the Stokes drift), waves act on the mean flow by creating Langmuir circulations and a ...
  • A dual sensor device to estimate fluid flow velocity at diffuse hydrothermal vents 

    Sarrazin, J.; Rodier, P.; Tivey, Margaret K.; Singh, Hanumant; Schultz, A.; Sarradin, P. M. (2009-06-12)
    Numerous attempts have been made over the last thirty years to estimate fluid flow rates at hydrothermal vents, either at the exit of black smoker chimneys or within diffuse flow areas. In this study, we combine two ...
  • Dynamic analysis of a launch and recovery system for a deep submersible 

    Vandiver, J. Kim (Woods Hole Oceanographic Institution, 1969-12)
    An analysis of the motion of a docking platform for a deep submersible is presented. The problem is defined as a docking platform, or cradle, suspended beneath a surface vessel by elastic elements, composed of cable, ...
  • The dynamics of geometrically compliant mooring systems 

    Gobat, Jason I. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-06)
    Geometrically compliant mooring systems that change their shape to accommodate deformations are common in oceanographic and offshore energy production applications. Because of the inherent geometric nonlinearities, ...
  • Echo statistics of individual and aggregations of scatterers in the water column of a random, oceanic waveguide 

    Jones, Benjamin A.; Colosi, John A.; Stanton, Timothy K. (Acoustical Society of America, 2014-07)
    The relative contributions of various physical factors to producing non-Rayleigh distributions of echo magnitudes in a waveguide are examined. Factors that are considered include (1) a stochastic, range-dependent sound-speed ...
  • Echolocation clicks of free-ranging Cuvier's beaked whales (Ziphius cavirostris) 

    Zimmer, Walter M. X.; Johnson, Mark P.; Madsen, Peter T.; Tyack, Peter L. (Acoustical Society of America, 2005-06)
    Strandings of beaked whales of the genera Ziphius and Mesoplodon have been reported to occur in conjunction with naval sonar use. Detection of the sounds from these elusive whales could reduce the risk of exposure, but ...
  • Eddy-driven pulses of respiration in the Sargasso Sea 

    Mourino-Carballido, Beatriz (2009-02)
    An analysis of nine years of data from the NW subtropical Atlantic reveals that variability in heterotrophic processes associated with (sub)mesoscale features has a major impact on the balance between photosynthesis and ...
  • The effect of internal waves on long range acoustic propagation in the ocean 

    Jaffee, Richard Jay (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-05)
    The acoustic-internal wave interaction in an acoustic waveguide is investigated using wave techniques. Refractive index fluctuations due to the vertical displacements of the internal waves create an inhomogeneous ...
  • The effect of wave breaking on surf-zone turbulence and alongshore currents : a modeling study 

    Feddersen, Falk; Trowbridge, John H. (American Meteorological Society, 2005-11)
    The effect of breaking-wave-generated turbulence on the mean circulation, turbulence, and bottom stress in the surf zone is poorly understood. A one-dimensional vertical coupled turbulence (k–ε) and mean-flow model is ...
  • Effects of estuarine and fluvial processes on sediment transport over deltaic tidal flats 

    Ralston, David K.; Geyer, W. Rockwell; Traykovski, Peter A.; Nidzieko, Nicholas J. (2012-01-25)
    Tidal flats at a river mouth feature estuarine and fluvial processes that distinguish them from tidal flats without river discharge. We combine field observations and a numerical model to investigate hydrodynamics and ...
  • Effects of internal waves on low frequency, long range, acoustic propagation in the deep ocean 

    Xu, Jinshan (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-09)
    This thesis covers a comprehensive analysis of long-range, deep-ocean, low-frequency, sound propagation experimental results obtained from the North Pacific Ocean. The statistics of acoustic fields after propagation ...
  • Effects of wave rollers and bottom stress on wave setup 

    Apotsos, Alex; Raubenheimer, Britt; Elgar, Steve; Guza, R. T.; Smith, Jerry A. (American Geophysical Union, 2007-02-03)
    Setup, the increase in the mean water level associated with breaking waves, observed between the shoreline and about 6-m water depth on an ocean beach is predicted well by a model that includes the effects of wave rollers ...
  • Effects of wave shape on sheet flow sediment transport 

    Hsu, Tian-Jian; Hanes, Daniel M. (American Geophysical Union, 2004-05-25)
    A two-phase model is implemented to study the effects of wave shape on the transport of coarse-grained sediment in the sheet flow regime. The model is based on balance equations for the average mass, momentum, and fluctuation ...
  • Efficient control based on a verified model for an autonomous underwater vehicle : a case study of Autonomous Benthic Explorer 

    Anderson, Jamie M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-02)
    The Autonomous Benthic Explorer (ABE) is an unmanned underwater vehicle being developed for scientific study of the deep ocean sea:floor. ABE will be completely autonomous from the surface which means that the lifetime ...
  • Effusive and explosive volcanism on the ultraslow-spreading Gakkel Ridge, 85°E 

    Pontbriand, Claire W.; Soule, Samuel A.; Sohn, Robert A.; Humphris, Susan E.; Kunz, Clayton G.; Singh, Hanumant; Nakamura, Ko-ichi; Jakobsson, Martin; Shank, Timothy M. (American Geophysical Union, 2012-10-06)
    We use high-definition seafloor digital imagery and multibeam bathymetric data acquired during the 2007 Arctic Gakkel Vents Expedition (AGAVE) to evaluate the volcanic characteristics of the 85°E segment of the ultraslow ...
  • Ekman veering, internal waves, and turbulence observed under Arctic sea ice 

    Cole, Sylvia T.; Timmermans, Mary-Louise; Toole, John M.; Krishfield, Richard A.; Thwaites, Fredrik T. (American Meteorological Society, 2014-05)
    The ice–ocean system is investigated on inertial to monthly time scales using winter 2009–10 observations from the first ice-tethered profiler (ITP) equipped with a velocity sensor (ITP-V). Fluctuations in surface winds, ...
  • Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45′S 

    Baba, Kiyoshi; Tarits, Pascal; Chave, Alan D.; Evans, Rob L.; Hirth, Greg; Mackie, Randall L. (American Geophysical Union, 2006-11-16)
    The electrical structure of the upper mantle beneath the East Pacific Rise (EPR) at 15°45′S is imaged by inverting seafloor magnetotelluric data obtained during the Mantle ELectromagnetic and Tomography (MELT) experiment. ...