Now showing items 537-556 of 840

  • Observations and numerical simulations of large-eddy circulation in the ocean surface mixed layer 

    Sundermeyer, Miles A.; Skyllingstad, Eric; Ledwell, James R.; Concannon, Brian; Terray, Eugene A.; Birch, Daniel; Pierce, Stephen D.; Cervantes, Brandy (John Wiley & Sons, 2014-11-06)
    Two near-surface dye releases were mapped on scales of minutes to hours temporally, meters to order 1 km horizontally, and 1–20 m vertically using a scanning, depth-resolving airborne lidar. In both cases, dye evolved into ...
  • Observations of broadband acoustic backscattering from nonlinear internal waves : assessing the contribution from microstructure 

    Lavery, Andone C.; Chu, Dezhang; Moum, James N. (IEEE, 2010-11-30)
    In this paper, measurements of high-frequency broadband (160-590 kHz) acoustic backscattering from surface trapped nonlinear internal waves of depression are presented. These waves are ideal for assessing the contribution ...
  • Observations of cross-shelf flow driven by cross-shelf winds on the inner continental shelf 

    Fewings, Melanie R.; Lentz, Steven J.; Fredericks, Janet J. (American Meteorological Society, 2008-11)
    Six-yr-long time series of winds, waves, and water velocity from a cabled coastal observatory in 12 m of water reveal the separate dependence of the cross-shelf velocity profile on cross-shelf and along-shelf winds, waves, ...
  • Observations of near-bottom flow in a wave-dominated nearshore environment 

    Fredericks, Janet J.; Trowbridge, John H.; Agrawal, Yogesh C. (Woods Hole Oceanographic Institution, 1994-02)
    To provide observational data for analysis of near-bottom, wave-induced flows, a downward-looking laser Doppler velocimeter (LDV) was deployed to profile the near-bed velocity structure of a six meter water column at a ...
  • Observations of ocean fluctuations between 15 and 23 hour periods in the Pacific 

    Blanding, Wayne R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-09)
    Pulse-like acoustic signals are transmitted from an acoustic source near Oahu to seven receivers off the west coast of the United States for a 124-day period in 1988. Acoustic travel-time oscillations are observed in the ...
  • Observations of sound-speed fluctuations on the New Jersey continental shelf in the summer of 2006 

    Colosi, John A.; Duda, Timothy F.; Lin, Ying-Tsong; Lynch, James F.; Newhall, Arthur E.; Cornuelle, Bruce D. (Acoustical Society of America, 2012-02)
    Environmental sensors moored on the New Jersey continental shelf tracked constant density surfaces (isopycnals) for 35 days in the summer of 2006. Sound-speed fluctuations from internal-wave vertical isopycnal displacements ...
  • Observations of swash zone velocities : a note on friction coefficients 

    Raubenheimer, Britt; Elgar, Steve; Guza, R. T. (American Geophysical Union, 2004-01-30)
    Vertical flow structure and turbulent dissipation in the swash zone are estimated using cross-shore fluid velocities observed on a low-sloped, fine-grained sandy beach [Raubenheimer, 2002] with two stacks of three current ...
  • Observations of turbulence in the ocean surface boundary layer : energetics and transport 

    Gerbi, Gregory P.; Trowbridge, John H.; Terray, Eugene A.; Plueddemann, Albert J.; Kukulka, Tobias (American Meteorological Society, 2009-05)
    Observations of turbulent kinetic energy (TKE) dynamics in the ocean surface boundary layer are presented here and compared with results from previous observational, numerical, and analytic studies. As in previous studies, ...
  • Observations of wave orbital scale ripples and a nonequilibrium time-dependent model 

    Traykovski, Peter A. (American Geophysical Union, 2007-06-30)
    Measurements of seafloor ripples under wave-dominated conditions from the LEO15 site and the Martha’s Vineyard coastal observatory were used to develop a time-dependent model for ripple geometry. The measurements consisted ...
  • Observed limiting cases of horizontal field coherence and array performance in a time-varying internal wavefield 

    Collis, Jon M.; Duda, Timothy F.; Lynch, James F.; DeFerrari, Harry A. (Acoustical Society of America, 2008-08-28)
    Using a moored source and horizontal/vertical line array combination, horizontal coherence properties of high signal to noise ratio (>=20 dB) 100–1600 Hz signals have been measured. Internal waves in the area of the ...
  • Ocean acoustical ray-tracing : Software Ray 

    Bowlin, James B.; Spiesberger, John L.; Duda, Timothy F.; Freitag, Lee E. (Woods Hole Oceanographic Institution, 1992-10)
    A new computer program for accurate calculation of acoustic ray paths through a range-varing ocean sound channel has been written. It is based on creating a model of the speed of sound in the ocean, consistent with input ...
  • Ocean Seismic Network Pilot Experiment 

    Stephen, Ralph A.; Spiess, Fred N.; Collins, John A.; Hildebrand, John A.; Orcutt, John A.; Peal, Kenneth R.; Vernon, F. L.; Wooding, Frank B. (2003-10-31)
    The primary goal of the Ocean Seismic Network Pilot Experiment (OSNPE) was to learn how to make high quality broadband seismic measurements on the ocean bottom in preparation for a permanent ocean seismic network. The ...
  • Ocean sound channel ray path perturbations from internal-wave shear and strain 

    Duda, Timothy F. (Acoustical Society of America, 2005-11)
    The relative importance of internal-wave strain and internal-wave shear on perturbation of acoustic ray trajectories in the ocean is analyzed. Previous estimates based on the Garrett-Munk internal-wave spectral model are ...
  • Oceanographic pursuit : networked control of multiple vehicles tracking dynamic ocean features 

    Reed, Brooks L.; Hover, Franz S. (Elsevier, 2014-05-29)
    We present an integrated framework for joint estimation and pursuit of dynamic features in the ocean, over large spatial scales and with multiple collaborating vehicles relying on limited communications. Our approach uses ...
  • Off-axis effects on the multipulse structure of sperm whale usual clicks with implications for sound production 

    Zimmer, Walter M. X.; Madsen, Peter T.; Teloni, Valeria; Johnson, Mark P.; Tyack, Peter L. (Acoustical Society of America, 2005-11)
    Sperm whales (Physeter macrocephalus) produce multipulsed clicks with their hypertrophied nasal complex. The currently accepted view of the sound generation process is based on the click structure measured directly in front ...
  • On acoustic scattering by a shell-covered seafloor 

    Stanton, Timothy K. (Acoustical Society of America, 2000-08)
    Acoustic scattering by the seafloor is sometimes influenced, if not dominated, by the presence of discrete volumetric objects such as shells. A series of measurements of target strength of a type of benthic shelled animal ...
  • On the acoustic diffraction by the edges of benthic shells 

    Stanton, Timothy K.; Chu, Dezhang (Acoustical Society of America, 2004-07)
    Recent laboratory measurements of acoustic backscattering by individual benthic shells have isolated the edge-diffracted echo from echoes due to the surface of the main body of the shell. The data indicate that the echo ...
  • On the echo interference in sound backscattering by densely aggregated targets 

    Gorska, Natalia; Chu, Dezhang (2004-12-01)
    It is important to understand the volume backscattering by dense aggregations of a variety of scattering objects such as bubbles or biological targets. This paper addresses the interference of the echoes from randomly ...
  • On the electromagnetic fields produced by marine frequency domain controlled sources 

    Chave, Alan D. (John Wiley & Sons, 2009-10-14)
    In recent years, marine controlled source electromagnetics (CSEM) has found increasing use in hydrocarbon exploration due to its ability to detect thin resistive zones beneath the seafloor. Although it must be recognized ...
  • On the statistics of magnetotelluric rotational invariants 

    Chave, Alan D. (Oxford University Press on behalf of The Royal Astronomical Society, 2013-10-25)
    The statistical properties of the Swift skew, the phase-sensitive skew and the WAL invariants I1−I7 and Q are examined through analytic derivation of their probability density functions and/or simulation based on a Gaussian ...