Now showing items 471-490 of 843

  • Mid-ocean ridge exploration with an autonomous underwater vehicle 

    Yoerger, Dana R.; Bradley, Albert M.; Jakuba, Michael V.; Tivey, Maurice A.; German, Christopher R.; Shank, Timothy M.; Embley, Robert W. (Oceanography Society, 2007-12)
    Human-occupied submersibles, towed vehicles, and tethered remotely operated vehicles (ROVs) have traditionally been used to study the deep seafloor. In recent years, however, autonomous underwater vehicles (AUVs) have ...
  • Mine burial experiments at the Martha’s Vineyard Coastal Observatory 

    Traykovski, Peter A.; Richardson, Michael D.; Mayer, Larry A.; Irish, James D. (IEEE, 2007-01)
    Several experiments to measure postimpact burial of seafloor mines by scour and fill have been conducted near the Woods Hole Oceanographic Institution's Martha's Vineyard Coastal Observatory (MVCO, Edgartown, MA). The ...
  • Mineral phase analysis of deep-sea hydrothermal particulates by a Raman spectroscopy expert algorithm : toward autonomous in situ experimentation and exploration 

    Breier, John A.; German, Christopher R.; White, Sheri N. (American Geophysical Union, 2009-05-14)
    This paper demonstrates that a Raman spectroscopy, point-counting technique can be used for phase analysis of minerals commonly found in deep-sea hydrothermal plumes, even for minerals with similar chemical compositions. ...
  • Mixing by shear instability at high Reynolds number 

    Geyer, W. Rockwell; Lavery, Andone C.; Scully, Malcolm E.; Trowbridge, John H. (American Geophysical Union, 2010-11-25)
    Shear instability is the dominant mechanism for converting fluid motion to mixing in the stratified ocean and atmosphere. The transition to turbulence has been well characterized in laboratory settings and numerical ...
  • Mixing in a coastal environment : 1. A view from dye dispersion 

    Ledwell, James R.; Duda, Timothy F.; Sundermeyer, Miles A.; Seim, Harvey E. (American Geophysical Union, 2004-10-26)
    Dye release experiments were performed together with microstructure profiling to compare the two methods of estimating diapycnal diffusivity during summer and fall stratification on the continental shelf south of New ...
  • Mixing processes and hydraulic control in a highly stratified estuary 

    MacDonald, Daniel G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-02)
    This thesis utilizes field data from the Fraser River Estuary, a highly stratified system located in southwestern British Columbia, Canada, to investigate the nature of mixing processes in a highly stratified environment, ...
  • Modal analysis of the range evolution of broadband wavefields in the North Pacific Ocean : low mode numbers 

    Udovydchenkov, Ilya A.; Brown, Michael G.; Duda, Timothy F.; Mercer, James A.; Andrew, Rex K.; Worcester, Peter F.; Dzieciuch, Matthew A.; Howe, Bruce M.; Colosi, John A. (Acoustical Society of America, 2012-06)
    The results of mode-processing measurements of broadband acoustic wavefields made in the fall of 2004 as part of the Long-Range Ocean Acoustic Propagation Experiment (LOAPEX) in the eastern North Pacific Ocean are reported ...
  • Modal analysis of vertical array receptions for the Heard Island Feasibility Test 

    Sperry, Brian J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-05)
    During the 1991 Heard Island Feasibility Test, a vertical hydrophone array deployed off Monterey, CA, recorded transmissions from a low-frequency acoustic source nearly 18,000 km away. By determining the modal structure ...
  • Modal processing for acoustic communications in shallow water experiment 

    Morozov, Andrey K.; Preisig, James C.; Papp, Joseph C. (Acoustical Society of America, 2008-09)
    Acoustical array data from the Shallow Water Acoustics experiment was processed to show the feasibility of broadband mode decomposition as a preprocessing method to reduce the effective channel delay spread and concentrate ...
  • A modal/WKB inversion method for determining sound speed profiles in the ocean and ocean bottom 

    Casey, Kevin D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-06)
    Two approaches to determining the ocean sound speed profile using measured acoustic modal eigenvalues are examined. Both methods use measured eigenvalues and mode dependent assumed values of the WKB phase integral as ...
  • Mode filters and energy conservation 

    Udovydchenkov, Ilya A.; Rypina, Irina I.; Brown, Michael G. (Acoustical Society of America, 2010-04-07)
    The discrete form of the mode filtering problem is considered. The relevant equations constitute a linear inverse problem. Solutions to problems of this type are subject to a well-known trade-off between resolution and ...
  • Model initialization in a tidally energetic regime : a dynamically adjusted objective analysis 

    Aretxabaleta, Alfredo L.; Smith, Keston W.; McGillicuddy, Dennis J.; Ballabrera-Poy, Joaquim (2011-01-24)
    A simple improvement to objective analysis of hydrographic data is proposed to eliminate spatial aliasing e ects in tidally energetic regions. The proposed method consists of the evaluation of anomalies from observations ...
  • Model of PAH and PCB bioaccumulation in Mya arenaria and application for site assessment in conjunction with sediment quality screening criteria 

    Levine, Rachel H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-06)
    A review of six methods for deriving sediment quality criteria SQC was conducted. Each approach was analyzed according to cost, difficulty, applicability and reliability. Results of this analysis led to the recommendation ...
  • Model simulations of the Bay of Fundy Gyre : 1. Climatological results 

    Aretxabaleta, Alfredo L.; McGillicuddy, Dennis J.; Smith, Keston W.; Lynch, Daniel R. (American Geophysical Union, 2008-10-29)
    The characteristics of a persistent gyre in the mouth of the Bay of Fundy are studied using model simulations. A set of climatological runs are conducted to evaluate the relative importance of the different forcing mechanisms ...
  • Model simulations of the Bay of Fundy Gyre : 2. Hindcasts for 2005–2007 reveal interannual variability in retentiveness 

    Aretxabaleta, Alfredo L.; McGillicuddy, Dennis J.; Smith, Keston W.; Manning, James P.; Lynch, Daniel R. (American Geophysical Union, 2009-09-03)
    A persistent gyre at the mouth of the Bay of Fundy results from a combination of tidal rectification and buoyancy forcing. Here we assess recent interannual variability in the strength of the gyre using data assimilative ...
  • Model-data comparisons of shear waves in the nearshore 

    Noyes, T. James; Guza, R. T.; Feddersen, Falk; Elgar, Steve; Herbers, T. H. C. (American Geophysical Union, 2005-05-27)
    Observations of shear waves, alongshore propagating meanders of the mean alongshore current with periods of a few minutes and alongshore wavelengths of a few hundred meters, are compared with model predictions based on ...
  • Modeled alongshore circulation and force balances onshore of a submarine canyon 

    Hansen, Jeff E.; Raubenheimer, Britt; List, Jeffrey H.; Elgar, Steve (John Wiley & Sons, 2015-03-23)
    Alongshore force balances, including the role of nonlinear advection, in the shoaling and surf zones onshore of a submarine canyon are investigated using a numerical modeling system (Delft3D/SWAN). The model is calibrated ...
  • Modeling a 300 kHz bathymetric sonar system 

    Malmquist, Kenneth A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-09)
    The Deep Submergence Laboratory has developed a family of calibrated high frequency bathymetric sonar systems for underwater survey. It is useful to have a detailed mathematical description of these systems to assist in ...
  • Modeling acoustic propagation of airgun array pulses recorded on tagged sperm whales (Physeter macrocephalus) 

    DeRuiter, Stacy L.; Tyack, Peter L.; Lin, Ying-Tsong; Newhall, Arthur E.; Lynch, James F.; Miller, Patrick J. O. (Acoustical Society of America, 2006-12)
    In 2002 and 2003, tagged sperm whales (Physeter macrocephalus) were experimentally exposed to airgun pulses in the Gulf of Mexico, with the tags providing acoustic recordings at measured ranges and depths. Ray trace and ...
  • Modeling and analysis of internal-tide generation and beamlike onshore propagation in the vicinity of shelfbreak canyons 

    Zhang, Weifeng G.; Duda, Timothy F.; Udovydchenkov, Ilya A. (American Meteorological Society, 2014-03)
    A hydrostatic numerical model with alongshore-uniform barotropic M2 tidal boundary forcing and idealized shelfbreak canyon bathymetries is used to study internal-tide generation and onshore propagation. A control simulation ...