Now showing items 243-262 of 888

  • Dissolved methane distributions and air-sea flux in the plume of a massive seep field, Coal Oil Point, California 

    Mau, Susan; Valentine, David L.; Clark, Jordan F.; Reed, Justin; Camilli, Richard; Washburn, Libe (American Geophysical Union, 2007-11-24)
    Large quantities of natural gas are emitted from the seafloor into the stratified coastal ocean near Coal Oil Point, Santa Barbara Channel, California. Methane was quantified in the down current surface water at 79 stations ...
  • A distributed approach to underwater acoustic communications 

    Bohner, Christopher George (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)
    A novel distributed underwater acoustic networking (UAN) protocol suitable for ad-hoc deployments of both stationary and mobile nodes dispersed across a relatively wide coverage area is presented. Nodes are dynamically ...
  • Distributed autonomy and formation control of a drifting swarm of autonomous underwater vehicles 

    Rypkema, Nicholas R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-09)
    Recent advances in autonomous underwater vehicle (AUV) technology have led to their wide-spread acceptance and adoption for use in scientific, commercial, and defence applications in the underwater domain. At the same time, ...
  • Distributed space–time cooperative schemes for underwater acoustic communications 

    Vajapeyam, Madhavan; Vedantam, Satish; Mitra, Urbashi; Preisig, James C.; Stojanovic, Milica (IEEE, 2008-10)
    In resource limited, large scale underwater sensor networks, cooperative communication over multiple hops offers opportunities to save power. Intermediate nodes between source and destination act as cooperative relays. ...
  • The distribution of wave heights and periods for seas with unimodal and bimodal power density spectra 

    Sharpe, Matthew M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-09)
    Observed distributions of wave heights and periods taken from one year of surface wave monitoring near Martha's Vineyard are compared to distributions based on narrow-band theory. The joint distributions of wave heights ...
  • Diurnal and semidiurnal internal tide energy flux at a continental slope in the South China Sea 

    Duda, Timothy F.; Rainville, Luc (American Geophysical Union, 2008-03-25)
    Barotropic (surface) and baroclinic (internal) tides were measured at four mooring sites during a field investigation of acoustic propagation characteristics and physical oceanography in the northern South China Sea. The ...
  • Diverse styles of submarine venting on the ultraslow spreading Mid-Cayman Rise 

    German, Christopher R.; Bowen, Andrew D.; Coleman, M. L.; Honig, D. L.; Huber, Julie A.; Jakuba, Michael V.; Kinsey, James C.; Kurz, Mark D.; Leroy, S.; McDermott, Jill M.; Mercier de Lepinay, B.; Nakamura, Ko-ichi; Seewald, Jeffrey S.; Smith, J. L.; Sylva, Sean P.; Van Dover, Cindy L.; Whitcomb, Louis L.; Yoerger, Dana R. (2010-06-24)
    Thirty years after the first discovery of high-temperature submarine venting, the vast majority of the global Mid Ocean Ridge remains unexplored for hydrothermal activity. Of particular interest are the world’s ultra-slow ...
  • 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, Pierre-Marie (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, ...
  • Dynamics of the direct intrusion of Gulf Stream ring water onto the Mid-Atlantic Bight shelf 

    Zhang, Weifeng G.; Gawarkiewicz, Glen G. (John Wiley & Sons, 2015-09-30)
    Onshore intrusions of offshore waters onto the Mid-Atlantic Bight shelf can greatly affect shelf circulation, biogeochemistry, and fisheries. Previous studies have concentrated on onshore intrusions of slope water. Here ...
  • 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 ...